com.wallstop-studios.unity-helpers
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<!doctype html><html lang=en class=no-js> <head><meta charset=utf-8><meta name=viewport content="width=device-width,initial-scale=1"><meta name=description content="Production-ready Unity utilities: 10-15x faster PRNGs, O(log n) spatial queries, zero-allocation pooling, Odin-level inspector tooling, and data-driven effects."><meta name=author content="Wallstop Studios"><link href=https://wallstop.github.io/unity-helpers/features/inspector/inspector-validation-attributes/ rel=canonical><link href=../inspector-conditional-display/ rel=prev><link href=../inspector-inline-editor/ rel=next><link rel=icon href=../../../assets/images/favicon.png><meta name=generator content="mkdocs-1.6.1, mkdocs-material-9.7.3"><title>Validation Attributes - Unity Helpers</title><link rel=stylesheet href=../../../assets/stylesheets/main.484c7ddc.min.css><link rel=stylesheet 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rel=preconnect href=https://fonts.gstatic.com crossorigin><link rel=stylesheet href="https://fonts.googleapis.com/css?family=Inter:300,300i,400,400i,700,700i%7CJetBrains+Mono:400,400i,700,700i&display=fallback"><style>:root{--md-text-font:"Inter";--md-code-font:"JetBrains Mono"}</style><link rel=stylesheet href=../../../css/timeago.css><link rel=stylesheet href=../../../stylesheets/custom.css><script>__md_scope=new URL("../../..",location),__md_hash=e=>[...e].reduce(((e,_)=>(e<<5)-e+_.charCodeAt(0)),0),__md_get=(e,_=localStorage,t=__md_scope)=>JSON.parse(_.getItem(t.pathname+"."+e)),__md_set=(e,_,t=localStorage,a=__md_scope)=>{try{t.setItem(a.pathname+"."+e,JSON.stringify(_))}catch(e){}}</script></head> <body dir=ltr data-md-color-scheme=slate data-md-color-primary=teal data-md-color-accent=deep-orange> <input class=md-toggle data-md-toggle=drawer type=checkbox id=__drawer autocomplete=off> <input class=md-toggle data-md-toggle=search type=checkbox id=__search autocomplete=off> <label class=md-overlay for=__drawer></label> <div data-md-component=skip> <a href=#inspector-validation-attributes class=md-skip> Skip to content </a> </div> <div data-md-component=announce> </div> <header class="md-header md-header--shadow md-header--lifted" data-md-component=header> <nav class="md-header__inner md-grid" aria-label=Header> <a href=../../.. title="Unity Helpers" class="md-header__button md-logo" aria-label="Unity Helpers" data-md-component=logo> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 8a3 3 0 0 0 3-3 3 3 0 0 0-3-3 3 3 0 0 0-3 3 3 3 0 0 0 3 3m0 3.54C9.64 9.35 6.5 8 3 8v11c3.5 0 6.64 1.35 9 3.54 2.36-2.19 5.5-3.54 9-3.54V8c-3.5 0-6.64 1.35-9 3.54"/></svg> </a> <label class="md-header__button md-icon" for=__drawer> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M3 6h18v2H3zm0 5h18v2H3zm0 5h18v2H3z"/></svg> </label> <div class=md-header__title data-md-component=header-title> <div class=md-header__ellipsis> <div class=md-header__topic> <span class=md-ellipsis> Unity Helpers </span> </div> <div class=md-header__topic data-md-component=header-topic> <span class=md-ellipsis> Validation Attributes </span> </div> </div> </div> <form class=md-header__option data-md-component=palette> <input class=md-option data-md-color-media data-md-color-scheme=slate data-md-color-primary=teal data-md-color-accent=deep-orange aria-label="Switch to light mode" type=radio name=__palette id=__palette_0> <label class="md-header__button md-icon" title="Switch to light mode" for=__palette_1 hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="m17.75 4.09-2.53 1.94.91 3.06-2.63-1.81-2.63 1.81.91-3.06-2.53-1.94L12.44 4l1.06-3 1.06 3zm3.5 6.91-1.64 1.25.59 1.98-1.7-1.17-1.7 1.17.59-1.98L15.75 11l2.06-.05L18.5 9l.69 1.95zm-2.28 4.95c.83-.08 1.72 1.1 1.19 1.85-.32.45-.66.87-1.08 1.27C15.17 23 8.84 23 4.94 19.07c-3.91-3.9-3.91-10.24 0-14.14.4-.4.82-.76 1.27-1.08.75-.53 1.93.36 1.85 1.19-.27 2.86.69 5.83 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for=__nav_3_1> <span class="md-nav__icon md-icon"></span> Inspector </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../inspector-overview/ class=md-nav__link> <span class=md-ellipsis> Overview </span> </a> </li> <li class=md-nav__item> <a href=../inspector-button/ class=md-nav__link> <span class=md-ellipsis> Buttons </span> </a> </li> <li class=md-nav__item> <a href=../inspector-grouping-attributes/ class=md-nav__link> <span class=md-ellipsis> Grouping Attributes </span> </a> </li> <li class=md-nav__item> <a href=../inspector-selection-attributes/ class=md-nav__link> <span class=md-ellipsis> Selection Attributes </span> </a> </li> <li class=md-nav__item> <a href=../inspector-conditional-display/ class=md-nav__link> <span class=md-ellipsis> Conditional Display </span> </a> </li> <li class="md-nav__item md-nav__item--active"> <input class="md-nav__toggle md-toggle" type=checkbox id=__toc> <label class="md-nav__link md-nav__link--active" for=__toc> <span class=md-ellipsis> Validation Attributes </span> <span class="md-nav__icon md-icon"></span> </label> <a href=./ class="md-nav__link md-nav__link--active"> <span class=md-ellipsis> Validation Attributes </span> </a> <nav class="md-nav md-nav--secondary" aria-label="Table of contents"> <label class=md-nav__title for=__toc> <span class="md-nav__icon md-icon"></span> Table of contents </label> <ul class=md-nav__list data-md-component=toc data-md-scrollfix> <li class=md-nav__item> <a href=#table-of-contents class=md-nav__link> <span class=md-ellipsis> Table of Contents </span> </a> </li> <li class=md-nav__item> <a href=#wreadonly class=md-nav__link> <span class=md-ellipsis> WReadOnly </span> </a> <nav class=md-nav aria-label=WReadOnly> <ul class=md-nav__list> <li class=md-nav__item> <a href=#basic-usage class=md-nav__link> <span class=md-ellipsis> Basic Usage </span> </a> </li> <li class=md-nav__item> <a href=#common-use-cases class=md-nav__link> <span class=md-ellipsis> Common Use Cases </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=#wnotnull class=md-nav__link> <span class=md-ellipsis> WNotNull </span> </a> <nav class=md-nav aria-label=WNotNull> <ul class=md-nav__list> <li class=md-nav__item> <a href=#basic-usage_1 class=md-nav__link> <span class=md-ellipsis> Basic Usage </span> </a> </li> <li class=md-nav__item> <a href=#wnotnullmessagetype-enum class=md-nav__link> <span class=md-ellipsis> WNotNullMessageType Enum </span> </a> </li> <li class=md-nav__item> <a href=#constructor-overloads class=md-nav__link> <span class=md-ellipsis> Constructor Overloads </span> </a> </li> <li class=md-nav__item> <a href=#inspector-display-examples class=md-nav__link> <span class=md-ellipsis> Inspector Display Examples </span> </a> </li> <li class=md-nav__item> <a href=#runtime-validation-with-checkfornulls class=md-nav__link> <span class=md-ellipsis> Runtime Validation with CheckForNulls() </span> </a> </li> <li class=md-nav__item> <a href=#editor-only-validation class=md-nav__link> <span class=md-ellipsis> Editor-Only Validation </span> </a> </li> <li class=md-nav__item> <a href=#combining-with-other-attributes class=md-nav__link> <span class=md-ellipsis> Combining with Other Attributes </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=#validateassignment class=md-nav__link> <span class=md-ellipsis> ValidateAssignment </span> </a> <nav class=md-nav aria-label=ValidateAssignment> <ul class=md-nav__list> <li class=md-nav__item> <a href=#what-validateassignment-validates class=md-nav__link> <span class=md-ellipsis> What ValidateAssignment Validates </span> </a> </li> <li class=md-nav__item> <a href=#basic-usage_2 class=md-nav__link> <span class=md-ellipsis> Basic Usage </span> </a> </li> <li class=md-nav__item> <a href=#validateassignmentmessagetype-enum class=md-nav__link> <span class=md-ellipsis> ValidateAssignmentMessageType Enum </span> </a> </li> <li class=md-nav__item> <a href=#constructor-overloads_1 class=md-nav__link> <span class=md-ellipsis> Constructor Overloads </span> </a> </li> <li class=md-nav__item> <a href=#inspector-display-examples_1 class=md-nav__link> <span class=md-ellipsis> Inspector Display Examples </span> </a> </li> <li class=md-nav__item> <a href=#runtime-validation-methods class=md-nav__link> <span class=md-ellipsis> Runtime Validation Methods </span> </a> </li> <li class=md-nav__item> <a href=#validateassignment-vs-wnotnull class=md-nav__link> <span class=md-ellipsis> ValidateAssignment vs WNotNull </span> </a> </li> <li class=md-nav__item> <a href=#combining-with-other-attributes_1 class=md-nav__link> <span class=md-ellipsis> Combining with Other Attributes </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=#best-practices class=md-nav__link> <span class=md-ellipsis> Best Practices </span> </a> <nav class=md-nav aria-label="Best Practices"> <ul class=md-nav__list> <li class=md-nav__item> <a href=#1-validate-early class=md-nav__link> <span class=md-ellipsis> 1. Validate Early </span> </a> </li> <li class=md-nav__item> <a href=#2-choose-the-right-validation-attribute class=md-nav__link> <span class=md-ellipsis> 2. Choose the Right Validation Attribute </span> </a> </li> <li class=md-nav__item> <a href=#3-use-wreadonly-for-computed-values class=md-nav__link> <span class=md-ellipsis> 3. Use WReadOnly for Computed Values </span> </a> </li> <li class=md-nav__item> <a href=#4-combine-with-relational-components class=md-nav__link> <span class=md-ellipsis> 4. Combine with Relational Components </span> </a> </li> <li class=md-nav__item> <a href=#5-document-intent class=md-nav__link> <span class=md-ellipsis> 5. Document Intent </span> </a> </li> <li class=md-nav__item> <a href=#6-use-with-scriptableobjects class=md-nav__link> <span class=md-ellipsis> 6. Use with ScriptableObjects </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=#see-also class=md-nav__link> <span class=md-ellipsis> See Also </span> </a> </li> </ul> </nav> </li> <li class=md-nav__item> <a href=../inspector-inline-editor/ class=md-nav__link> <span class=md-ellipsis> Inline Editor </span> </a> </li> <li class=md-nav__item> <a href=../inspector-settings/ class=md-nav__link> <span class=md-ellipsis> Inspector Settings </span> </a> </li> <li class=md-nav__item> <a href=../utility-components/ class=md-nav__link> <span class=md-ellipsis> Utility Components </span> </a> </li> <li class=md-nav__item> <a href=../visual-components/ class=md-nav__link> <span class=md-ellipsis> Visual Components </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--section md-nav__item--nested"> <input class="md-nav__toggle md-toggle md-toggle--indeterminate" type=checkbox id=__nav_3_2> <label class=md-nav__link for=__nav_3_2 id=__nav_3_2_label tabindex> <span class=md-ellipsis> Relational Components </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_3_2_label aria-expanded=false> <label class=md-nav__title for=__nav_3_2> <span class="md-nav__icon md-icon"></span> Relational Components </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../relational-components/relational-components/ class=md-nav__link> <span class=md-ellipsis> Overview </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--section md-nav__item--nested"> <input class="md-nav__toggle md-toggle md-toggle--indeterminate" type=checkbox id=__nav_3_3> <label class=md-nav__link for=__nav_3_3 id=__nav_3_3_label tabindex> <span class=md-ellipsis> Spatial Data Structures </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_3_3_label aria-expanded=false> <label class=md-nav__title for=__nav_3_3> <span class="md-nav__icon md-icon"></span> Spatial Data Structures </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../spatial/spatial-trees-2d-guide/ class=md-nav__link> <span class=md-ellipsis> 2D Spatial Trees </span> </a> </li> <li class=md-nav__item> <a href=../../spatial/spatial-trees-3d-guide/ class=md-nav__link> <span class=md-ellipsis> 3D Spatial Trees </span> </a> </li> <li class=md-nav__item> <a href=../../spatial/hulls/ class=md-nav__link> <span class=md-ellipsis> Hull Algorithms </span> </a> </li> <li class=md-nav__item> <a href=../../spatial/spatial-tree-semantics/ class=md-nav__link> <span class=md-ellipsis> Spatial Tree Semantics </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--section md-nav__item--nested"> <input class="md-nav__toggle md-toggle md-toggle--indeterminate" type=checkbox id=__nav_3_4> <label class=md-nav__link for=__nav_3_4 id=__nav_3_4_label tabindex> <span class=md-ellipsis> Effects System </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_3_4_label aria-expanded=false> <label class=md-nav__title for=__nav_3_4> <span class="md-nav__icon md-icon"></span> Effects System </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../effects/effects-system/ class=md-nav__link> <span class=md-ellipsis> Overview </span> </a> </li> <li class=md-nav__item> <a href=../../effects/effects-system-tutorial/ class=md-nav__link> <span class=md-ellipsis> Tutorial </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--section md-nav__item--nested"> <input class="md-nav__toggle md-toggle md-toggle--indeterminate" type=checkbox id=__nav_3_5> <label class=md-nav__link for=__nav_3_5 id=__nav_3_5_label tabindex> <span class=md-ellipsis> Serialization </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_3_5_label aria-expanded=false> <label class=md-nav__title for=__nav_3_5> <span class="md-nav__icon md-icon"></span> Serialization </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../serialization/serialization/ class=md-nav__link> <span class=md-ellipsis> Overview </span> </a> </li> <li class=md-nav__item> <a href=../../serialization/serialization-types/ class=md-nav__link> <span class=md-ellipsis> Serializable Types </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--section md-nav__item--nested"> <input class="md-nav__toggle md-toggle md-toggle--indeterminate" type=checkbox id=__nav_3_6> <label class=md-nav__link for=__nav_3_6 id=__nav_3_6_label tabindex> <span class=md-ellipsis> Utilities </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_3_6_label aria-expanded=false> <label class=md-nav__title for=__nav_3_6> <span class="md-nav__icon md-icon"></span> Utilities </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../utilities/math-and-extensions/ class=md-nav__link> <span class=md-ellipsis> Math & Extensions </span> </a> </li> <li class=md-nav__item> <a href=../../utilities/data-structures/ class=md-nav__link> <span class=md-ellipsis> Data Structures </span> </a> </li> <li class=md-nav__item> <a href=../../utilities/random-generators/ class=md-nav__link> <span class=md-ellipsis> Random Generators </span> </a> </li> <li class=md-nav__item> <a href=../../utilities/singletons/ class=md-nav__link> <span class=md-ellipsis> Singletons </span> </a> </li> <li class=md-nav__item> <a href=../../utilities/reflection-helpers/ class=md-nav__link> <span class=md-ellipsis> Reflection Helpers </span> </a> </li> <li class=md-nav__item> <a href=../../utilities/helper-utilities/ class=md-nav__link> <span class=md-ellipsis> Helper Utilities </span> </a> </li> <li class=md-nav__item> <a href=../../utilities/pooling-guide/ class=md-nav__link> <span class=md-ellipsis> Pooling Guide </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--section md-nav__item--nested"> <input class="md-nav__toggle md-toggle md-toggle--indeterminate" type=checkbox id=__nav_3_7> <label class=md-nav__link for=__nav_3_7 id=__nav_3_7_label tabindex> <span class=md-ellipsis> Logging </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_3_7_label aria-expanded=false> <label class=md-nav__title for=__nav_3_7> <span class="md-nav__icon md-icon"></span> Logging </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../logging/logging-extensions/ class=md-nav__link> <span class=md-ellipsis> Logging Extensions </span> </a> </li> <li class=md-nav__item> <a href=../../logging/unity-main-thread-dispatcher/ class=md-nav__link> <span class=md-ellipsis> Main Thread Dispatcher </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--section md-nav__item--nested"> <input class="md-nav__toggle md-toggle md-toggle--indeterminate" type=checkbox id=__nav_3_8> <label class=md-nav__link for=__nav_3_8 id=__nav_3_8_label tabindex> <span class=md-ellipsis> Editor Tools </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=2 aria-labelledby=__nav_3_8_label aria-expanded=false> <label class=md-nav__title for=__nav_3_8> <span class="md-nav__icon md-icon"></span> Editor Tools </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../editor-tools/editor-tools-guide/ class=md-nav__link> <span class=md-ellipsis> Tools Guide </span> </a> </li> <li class=md-nav__item> <a href=../../editor-tools/unity-method-analyzer/ class=md-nav__link> <span class=md-ellipsis> Unity Method Analyzer </span> </a> </li> <li class=md-nav__item> <a href=../../editor-tools/asset-change-detection/ class=md-nav__link> <span class=md-ellipsis> Asset Change Detection </span> </a> </li> <li class=md-nav__item> <a href=../../editor-tools/failed-tests-exporter/ class=md-nav__link> <span class=md-ellipsis> Failed Tests Exporter </span> </a> </li> </ul> </nav> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle md-toggle--indeterminate" type=checkbox id=__nav_4> <label class=md-nav__link for=__nav_4 id=__nav_4_label tabindex=0> <span class=md-ellipsis> Performance </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=1 aria-labelledby=__nav_4_label aria-expanded=false> <label class=md-nav__title for=__nav_4> <span class="md-nav__icon md-icon"></span> Performance </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../../performance/random-performance/ class=md-nav__link> <span class=md-ellipsis> Random Generators </span> </a> </li> <li class=md-nav__item> <a href=../../../performance/spatial-tree-2d-performance/ class=md-nav__link> <span class=md-ellipsis> Spatial Trees 2D </span> </a> </li> <li class=md-nav__item> <a href=../../../performance/spatial-tree-3d-performance/ class=md-nav__link> <span class=md-ellipsis> Spatial Trees 3D </span> </a> </li> <li class=md-nav__item> <a href=../../../performance/relational-components-performance/ class=md-nav__link> <span class=md-ellipsis> Relational Components </span> </a> </li> <li class=md-nav__item> <a href=../../../performance/reflection-performance/ class=md-nav__link> <span class=md-ellipsis> Reflection Helpers </span> </a> </li> <li class=md-nav__item> <a href=../../../performance/ilist-sorting-performance/ class=md-nav__link> <span class=md-ellipsis> IList Sorting </span> </a> </li> <li class=md-nav__item> <a href=../../../performance/baseline-tests-performance/ class=md-nav__link> <span class=md-ellipsis> Baseline Tests </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle md-toggle--indeterminate" type=checkbox id=__nav_5> <label class=md-nav__link for=__nav_5 id=__nav_5_label tabindex=0> <span class=md-ellipsis> Guides </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=1 aria-labelledby=__nav_5_label aria-expanded=false> <label class=md-nav__title for=__nav_5> <span class="md-nav__icon md-icon"></span> Guides </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../../guides/odin-migration-guide/ class=md-nav__link> <span class=md-ellipsis> Odin Migration </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle md-toggle--indeterminate" type=checkbox id=__nav_6> <label class=md-nav__link for=__nav_6 id=__nav_6_label tabindex=0> <span class=md-ellipsis> Contributing </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=1 aria-labelledby=__nav_6_label aria-expanded=false> <label class=md-nav__title for=__nav_6> <span class="md-nav__icon md-icon"></span> Contributing </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../../project/contributing/ class=md-nav__link> <span class=md-ellipsis> Overview </span> </a> </li> <li class=md-nav__item> <a href=../../../contributing/testing-patterns/ class=md-nav__link> <span class=md-ellipsis> Testing Patterns </span> </a> </li> </ul> </nav> </li> <li class="md-nav__item md-nav__item--nested"> <input class="md-nav__toggle md-toggle md-toggle--indeterminate" type=checkbox id=__nav_7> <label class=md-nav__link for=__nav_7 id=__nav_7_label tabindex=0> <span class=md-ellipsis> Project </span> <span class="md-nav__icon md-icon"></span> </label> <nav class=md-nav data-md-level=1 aria-labelledby=__nav_7_label aria-expanded=false> <label class=md-nav__title for=__nav_7> <span class="md-nav__icon md-icon"></span> Project </label> <ul class=md-nav__list data-md-scrollfix> <li class=md-nav__item> <a href=../../../project/license/ class=md-nav__link> <span class=md-ellipsis> License </span> </a> </li> <li class=md-nav__item> <a href=../../../project/third-party-notices/ class=md-nav__link> <span class=md-ellipsis> Third-Party Notices </span> </a> </li> <li class=md-nav__item> <a href=../../../project/llms-txt/ class=md-nav__link> <span class=md-ellipsis> LLMs.txt </span> </a> </li> </ul> </nav> </li> </ul> </nav> </div> </div> </div> <div class=md-content data-md-component=content> <nav class=md-path aria-label=Navigation> <ol class=md-path__list> <li class=md-path__item> <a href=../../.. class=md-path__link> <span class=md-ellipsis> Home </span> </a> </li> <li class=md-path__item> <a href=../inspector-overview/ class=md-path__link> <span class=md-ellipsis> Features </span> </a> </li> <li class=md-path__item> <a href=../inspector-overview/ class=md-path__link> <span class=md-ellipsis> Inspector </span> </a> </li> </ol> </nav> <article class="md-content__inner md-typeset"> <a href=https://github.com/wallstop/unity-helpers/edit/main/docs/features/inspector/inspector-validation-attributes.md title="Edit this page" class="md-content__button md-icon" rel=edit> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20.71 7.04c.39-.39.39-1.04 0-1.41l-2.34-2.34c-.37-.39-1.02-.39-1.41 0l-1.84 1.83 3.75 3.75M3 17.25V21h3.75L17.81 9.93l-3.75-3.75z"/></svg> </a> <a href=https://github.com/wallstop/unity-helpers/raw/main/docs/features/inspector/inspector-validation-attributes.md title="View source of this page" class="md-content__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M12 9a3 3 0 0 0-3 3 3 3 0 0 0 3 3 3 3 0 0 0 3-3 3 3 0 0 0-3-3m0 8a5 5 0 0 1-5-5 5 5 0 0 1 5-5 5 5 0 0 1 5 5 5 5 0 0 1-5 5m0-12.5C7 4.5 2.73 7.61 1 12c1.73 4.39 6 7.5 11 7.5s9.27-3.11 11-7.5c-1.73-4.39-6-7.5-11-7.5"/></svg> </a> <h1 id=inspector-validation-attributes>Inspector Validation Attributes<a class=headerlink href=#inspector-validation-attributes title="Permanent link">¶</a></h1> <p><strong>Protect your data with declarative validation and read-only presentation.</strong></p> <p>Unity Helpers provides validation attributes that help maintain data integrity and prevent accidental modifications. These attributes work seamlessly with the Unity inspector and can validate fields at runtime.</p> <hr> <h2 id=table-of-contents>Table of Contents<a class=headerlink href=#table-of-contents title="Permanent link">¶</a></h2> <ul> <li><a href=#wreadonly>WReadOnly</a></li> <li><a href=#wnotnull>WNotNull</a></li> <li><a href=#validateassignment>ValidateAssignment</a></li> <li><a href=#best-practices>Best Practices</a></li> </ul> <hr> <h2 id=wreadonly>WReadOnly<a class=headerlink href=#wreadonly title="Permanent link">¶</a></h2> <p>Displays a field in the inspector as read-only, preventing accidental modifications while keeping the value visible.</p> <h3 id=basic-usage>Basic Usage<a class=headerlink href=#basic-usage title="Permanent link">¶</a></h3> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-0-1> 1</a></span>
<span class=normal><a href=#__codelineno-0-2> 2</a></span>
<span class=normal><a href=#__codelineno-0-3> 3</a></span>
<span class=normal><a href=#__codelineno-0-4> 4</a></span>
<span class=normal><a href=#__codelineno-0-5> 5</a></span>
<span class=normal><a href=#__codelineno-0-6> 6</a></span>
<span class=normal><a href=#__codelineno-0-7> 7</a></span>
<span class=normal><a href=#__codelineno-0-8> 8</a></span>
<span class=normal><a href=#__codelineno-0-9> 9</a></span>
<span class=normal><a href=#__codelineno-0-10>10</a></span>
<span class=normal><a href=#__codelineno-0-11>11</a></span>
<span class=normal><a href=#__codelineno-0-12>12</a></span>
<span class=normal><a href=#__codelineno-0-13>13</a></span>
<span class=normal><a href=#__codelineno-0-14>14</a></span>
<span class=normal><a href=#__codelineno-0-15>15</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-0-1><a id=__codelineno-0-1 name=__codelineno-0-1></a><span class=k>using</span><span class=w> </span><span class=nn>UnityEngine</span><span class=p>;</span>
</span><span id=__span-0-2><a id=__codelineno-0-2 name=__codelineno-0-2></a><span class=k>using</span><span class=w> </span><span class=nn>WallstopStudios.UnityHelpers.Core.Attributes</span><span class=p>;</span>
</span><span id=__span-0-3><a id=__codelineno-0-3 name=__codelineno-0-3></a>
</span><span id=__span-0-4><a id=__codelineno-0-4 name=__codelineno-0-4></a><span class=k>public</span><span class=w> </span><span class=k>class</span><span class=w> </span><span class=nc>GameManagerReadOnly</span><span class=w> </span><span class=p>:</span><span class=w> </span><span class=n>MonoBehaviour</span>
</span><span id=__span-0-5><a id=__codelineno-0-5 name=__codelineno-0-5></a><span class=p>{</span>
</span><span id=__span-0-6><a id=__codelineno-0-6 name=__codelineno-0-6></a><span class=w> </span><span class=na>[WReadOnly]</span>
</span><span id=__span-0-7><a id=__codelineno-0-7 name=__codelineno-0-7></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=kt>string</span><span class=w> </span><span class=n>sessionId</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=s>"abc-123-xyz"</span><span class=p>;</span>
</span><span id=__span-0-8><a id=__codelineno-0-8 name=__codelineno-0-8></a>
</span><span id=__span-0-9><a id=__codelineno-0-9 name=__codelineno-0-9></a><span class=w> </span><span class=na>[WReadOnly]</span>
</span><span id=__span-0-10><a id=__codelineno-0-10 name=__codelineno-0-10></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=kt>float</span><span class=w> </span><span class=n>elapsedTime</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=mf>0f</span><span class=p>;</span>
</span><span id=__span-0-11><a id=__codelineno-0-11 name=__codelineno-0-11></a>
</span><span id=__span-0-12><a id=__codelineno-0-12 name=__codelineno-0-12></a><span class=w> </span><span class=na>[WReadOnly]</span>
</span><span id=__span-0-13><a id=__codelineno-0-13 name=__codelineno-0-13></a><span class=w> </span><span class=na>[SerializeField]</span>
</span><span id=__span-0-14><a id=__codelineno-0-14 name=__codelineno-0-14></a><span class=w> </span><span class=k>private</span><span class=w> </span><span class=kt>int</span><span class=w> </span><span class=n>internalScore</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=mi>100</span><span class=p>;</span>
</span><span id=__span-0-15><a id=__codelineno-0-15 name=__codelineno-0-15></a><span class=p>}</span>
</span></code></pre></div></td></tr></table></div> <p><strong>Behavior:</strong></p> <ul> <li>Field appears grayed out in the inspector</li> <li>Value is visible but cannot be edited through the inspector</li> <li>Useful for displaying computed values, debug info, or auto-generated IDs</li> <li>Works with any serializable field type</li> </ul> <blockquote> <p><strong>Visual Reference</strong></p> <p><img alt="WReadOnly attribute showing grayed-out fields in the inspector" src=../../../images/inspector/validation/wreadonly-basic.png></p> <p><em>Fields marked with [WReadOnly] appear grayed out and cannot be edited</em></p> </blockquote> <h3 id=common-use-cases>Common Use Cases<a class=headerlink href=#common-use-cases title="Permanent link">¶</a></h3> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-1-1> 1</a></span>
<span class=normal><a href=#__codelineno-1-2> 2</a></span>
<span class=normal><a href=#__codelineno-1-3> 3</a></span>
<span class=normal><a href=#__codelineno-1-4> 4</a></span>
<span class=normal><a href=#__codelineno-1-5> 5</a></span>
<span class=normal><a href=#__codelineno-1-6> 6</a></span>
<span class=normal><a href=#__codelineno-1-7> 7</a></span>
<span class=normal><a href=#__codelineno-1-8> 8</a></span>
<span class=normal><a href=#__codelineno-1-9> 9</a></span>
<span class=normal><a href=#__codelineno-1-10>10</a></span>
<span class=normal><a href=#__codelineno-1-11>11</a></span>
<span class=normal><a href=#__codelineno-1-12>12</a></span>
<span class=normal><a href=#__codelineno-1-13>13</a></span>
<span class=normal><a href=#__codelineno-1-14>14</a></span>
<span class=normal><a href=#__codelineno-1-15>15</a></span>
<span class=normal><a href=#__codelineno-1-16>16</a></span>
<span class=normal><a href=#__codelineno-1-17>17</a></span>
<span class=normal><a href=#__codelineno-1-18>18</a></span>
<span class=normal><a href=#__codelineno-1-19>19</a></span>
<span class=normal><a href=#__codelineno-1-20>20</a></span>
<span class=normal><a href=#__codelineno-1-21>21</a></span>
<span class=normal><a href=#__codelineno-1-22>22</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-1-1><a id=__codelineno-1-1 name=__codelineno-1-1></a><span class=k>using</span><span class=w> </span><span class=nn>UnityEngine</span><span class=p>;</span>
</span><span id=__span-1-2><a id=__codelineno-1-2 name=__codelineno-1-2></a><span class=k>using</span><span class=w> </span><span class=nn>WallstopStudios.UnityHelpers.Core.Attributes</span><span class=p>;</span>
</span><span id=__span-1-3><a id=__codelineno-1-3 name=__codelineno-1-3></a>
</span><span id=__span-1-4><a id=__codelineno-1-4 name=__codelineno-1-4></a><span class=k>public</span><span class=w> </span><span class=k>class</span><span class=w> </span><span class=nc>EntityReadOnly</span><span class=w> </span><span class=p>:</span><span class=w> </span><span class=n>MonoBehaviour</span>
</span><span id=__span-1-5><a id=__codelineno-1-5 name=__codelineno-1-5></a><span class=p>{</span>
</span><span id=__span-1-6><a id=__codelineno-1-6 name=__codelineno-1-6></a><span class=w> </span><span class=c1>// Auto-generated unique identifier</span>
</span><span id=__span-1-7><a id=__codelineno-1-7 name=__codelineno-1-7></a><span class=w> </span><span class=na>[WReadOnly]</span>
</span><span id=__span-1-8><a id=__codelineno-1-8 name=__codelineno-1-8></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=kt>string</span><span class=w> </span><span class=n>entityId</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>System</span><span class=p>.</span><span class=n>Guid</span><span class=p>.</span><span class=n>NewGuid</span><span class=p>().</span><span class=n>ToString</span><span class=p>();</span>
</span><span id=__span-1-9><a id=__codelineno-1-9 name=__codelineno-1-9></a>
</span><span id=__span-1-10><a id=__codelineno-1-10 name=__codelineno-1-10></a><span class=w> </span><span class=c1>// Computed property exposed for debugging</span>
</span><span id=__span-1-11><a id=__codelineno-1-11 name=__codelineno-1-11></a><span class=w> </span><span class=na>[WReadOnly]</span>
</span><span id=__span-1-12><a id=__codelineno-1-12 name=__codelineno-1-12></a><span class=w> </span><span class=na>[SerializeField]</span>
</span><span id=__span-1-13><a id=__codelineno-1-13 name=__codelineno-1-13></a><span class=w> </span><span class=k>private</span><span class=w> </span><span class=kt>float</span><span class=w> </span><span class=n>_currentHealth</span><span class=p>;</span>
</span><span id=__span-1-14><a id=__codelineno-1-14 name=__codelineno-1-14></a>
</span><span id=__span-1-15><a id=__codelineno-1-15 name=__codelineno-1-15></a><span class=w> </span><span class=c1>// Reference that should only be set via code</span>
</span><span id=__span-1-16><a id=__codelineno-1-16 name=__codelineno-1-16></a><span class=w> </span><span class=na>[WReadOnly]</span>
</span><span id=__span-1-17><a id=__codelineno-1-17 name=__codelineno-1-17></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>Transform</span><span class=w> </span><span class=n>cachedTarget</span><span class=p>;</span>
</span><span id=__span-1-18><a id=__codelineno-1-18 name=__codelineno-1-18></a>
</span><span id=__span-1-19><a id=__codelineno-1-19 name=__codelineno-1-19></a><span class=w> </span><span class=c1>// Frame counter for debugging</span>
</span><span id=__span-1-20><a id=__codelineno-1-20 name=__codelineno-1-20></a><span class=w> </span><span class=na>[WReadOnly]</span>
</span><span id=__span-1-21><a id=__codelineno-1-21 name=__codelineno-1-21></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=kt>int</span><span class=w> </span><span class=n>framesSinceLastUpdate</span><span class=p>;</span>
</span><span id=__span-1-22><a id=__codelineno-1-22 name=__codelineno-1-22></a><span class=p>}</span>
</span></code></pre></div></td></tr></table></div> <p><strong>Why Use WReadOnly:</strong></p> <ul> <li><strong>Prevent accidents</strong>: Stop designers from accidentally modifying auto-generated values</li> <li><strong>Debug visibility</strong>: Show internal state without allowing modification</li> <li><strong>Documentation</strong>: Make it clear which fields are managed by code vs. configured in the editor</li> <li><strong>Data integrity</strong>: Protect computed or cached values from manual overrides</li> </ul> <blockquote> <p><strong>Visual Reference</strong></p> <p><img alt="WReadOnly showing various field types as read-only" src=../../../images/inspector/validation/wreadonly-use-cases.png></p> <p><em>Multiple field types (string, float, Transform, int) displayed as read-only</em></p> </blockquote> <hr> <h2 id=wnotnull>WNotNull<a class=headerlink href=#wnotnull title="Permanent link">¶</a></h2> <p>Validates that a field is not null, providing both <strong>visual inspector feedback</strong> and <strong>runtime validation</strong>. When a field marked with <code>[WNotNull]</code> is null, the inspector displays a warning or error HelpBox. Additionally, calling <code>CheckForNulls()</code> on an object will throw an <code>ArgumentNullException</code> for any null <code>[WNotNull]</code> fields.</p> <h3 id=basic-usage_1>Basic Usage<a class=headerlink href=#basic-usage_1 title="Permanent link">¶</a></h3> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-2-1> 1</a></span>
<span class=normal><a href=#__codelineno-2-2> 2</a></span>
<span class=normal><a href=#__codelineno-2-3> 3</a></span>
<span class=normal><a href=#__codelineno-2-4> 4</a></span>
<span class=normal><a href=#__codelineno-2-5> 5</a></span>
<span class=normal><a href=#__codelineno-2-6> 6</a></span>
<span class=normal><a href=#__codelineno-2-7> 7</a></span>
<span class=normal><a href=#__codelineno-2-8> 8</a></span>
<span class=normal><a href=#__codelineno-2-9> 9</a></span>
<span class=normal><a href=#__codelineno-2-10>10</a></span>
<span class=normal><a href=#__codelineno-2-11>11</a></span>
<span class=normal><a href=#__codelineno-2-12>12</a></span>
<span class=normal><a href=#__codelineno-2-13>13</a></span>
<span class=normal><a href=#__codelineno-2-14>14</a></span>
<span class=normal><a href=#__codelineno-2-15>15</a></span>
<span class=normal><a href=#__codelineno-2-16>16</a></span>
<span class=normal><a href=#__codelineno-2-17>17</a></span>
<span class=normal><a href=#__codelineno-2-18>18</a></span>
<span class=normal><a href=#__codelineno-2-19>19</a></span>
<span class=normal><a href=#__codelineno-2-20>20</a></span>
<span class=normal><a href=#__codelineno-2-21>21</a></span>
<span class=normal><a href=#__codelineno-2-22>22</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-2-1><a id=__codelineno-2-1 name=__codelineno-2-1></a><span class=k>using</span><span class=w> </span><span class=nn>UnityEngine</span><span class=p>;</span>
</span><span id=__span-2-2><a id=__codelineno-2-2 name=__codelineno-2-2></a><span class=k>using</span><span class=w> </span><span class=nn>WallstopStudios.UnityHelpers.Core.Attributes</span><span class=p>;</span>
</span><span id=__span-2-3><a id=__codelineno-2-3 name=__codelineno-2-3></a>
</span><span id=__span-2-4><a id=__codelineno-2-4 name=__codelineno-2-4></a><span class=k>public</span><span class=w> </span><span class=k>class</span><span class=w> </span><span class=nc>PlayerControllerNotNull</span><span class=w> </span><span class=p>:</span><span class=w> </span><span class=n>MonoBehaviour</span>
</span><span id=__span-2-5><a id=__codelineno-2-5 name=__codelineno-2-5></a><span class=p>{</span>
</span><span id=__span-2-6><a id=__codelineno-2-6 name=__codelineno-2-6></a><span class=w> </span><span class=na>[WNotNull]</span>
</span><span id=__span-2-7><a id=__codelineno-2-7 name=__codelineno-2-7></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>Rigidbody2D</span><span class=w> </span><span class=n>rb</span><span class=p>;</span>
</span><span id=__span-2-8><a id=__codelineno-2-8 name=__codelineno-2-8></a>
</span><span id=__span-2-9><a id=__codelineno-2-9 name=__codelineno-2-9></a><span class=w> </span><span class=na>[WNotNull]</span>
</span><span id=__span-2-10><a id=__codelineno-2-10 name=__codelineno-2-10></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>SpriteRenderer</span><span class=w> </span><span class=n>spriteRenderer</span><span class=p>;</span>
</span><span id=__span-2-11><a id=__codelineno-2-11 name=__codelineno-2-11></a>
</span><span id=__span-2-12><a id=__codelineno-2-12 name=__codelineno-2-12></a><span class=w> </span><span class=na>[WNotNull]</span>
</span><span id=__span-2-13><a id=__codelineno-2-13 name=__codelineno-2-13></a><span class=w> </span><span class=na>[SerializeField]</span>
</span><span id=__span-2-14><a id=__codelineno-2-14 name=__codelineno-2-14></a><span class=w> </span><span class=k>private</span><span class=w> </span><span class=n>AudioSource</span><span class=w> </span><span class=n>audioSource</span><span class=p>;</span>
</span><span id=__span-2-15><a id=__codelineno-2-15 name=__codelineno-2-15></a>
</span><span id=__span-2-16><a id=__codelineno-2-16 name=__codelineno-2-16></a><span class=w> </span><span class=k>private</span><span class=w> </span><span class=k>void</span><span class=w> </span><span class=nf>Awake</span><span class=p>()</span>
</span><span id=__span-2-17><a id=__codelineno-2-17 name=__codelineno-2-17></a><span class=w> </span><span class=p>{</span>
</span><span id=__span-2-18><a id=__codelineno-2-18 name=__codelineno-2-18></a><span class=w> </span><span class=c1>// Validates all [WNotNull] fields are assigned</span>
</span><span id=__span-2-19><a id=__codelineno-2-19 name=__codelineno-2-19></a><span class=w> </span><span class=c1>// Throws ArgumentNullException if any are null in Editor ONLY</span>
</span><span id=__span-2-20><a id=__codelineno-2-20 name=__codelineno-2-20></a><span class=w> </span><span class=k>this</span><span class=p>.</span><span class=n>CheckForNulls</span><span class=p>();</span>
</span><span id=__span-2-21><a id=__codelineno-2-21 name=__codelineno-2-21></a><span class=w> </span><span class=p>}</span>
</span><span id=__span-2-22><a id=__codelineno-2-22 name=__codelineno-2-22></a><span class=p>}</span>
</span></code></pre></div></td></tr></table></div> <p><strong>Behavior:</strong></p> <ul> <li><strong>Inspector feedback</strong>: Displays a HelpBox warning (yellow) or error (red) when the field is null</li> <li><strong>Runtime validation</strong>: Call <code>this.CheckForNulls()</code> to validate all <code>[WNotNull]</code> fields</li> <li>Throws <code>ArgumentNullException</code> with the field name if any marked field is null</li> <li>Works with both Unity <code>Object</code> types and plain C# objects</li> <li>All validation runs <strong>only in the Unity Editor</strong> (stripped in builds for performance)</li> </ul> <blockquote> <p><strong>Visual Reference</strong></p> <p><img alt="WNotNull fields in inspector with null references highlighted" src=../../../images/inspector/validation/wnotnull-inspector.png></p> <p><em>Fields marked with [WNotNull] display a HelpBox in the inspector when null</em></p> </blockquote> <h3 id=wnotnullmessagetype-enum>WNotNullMessageType Enum<a class=headerlink href=#wnotnullmessagetype-enum title="Permanent link">¶</a></h3> <p>The <code>WNotNullMessageType</code> enum controls how null fields are displayed in the inspector:</p> <table> <thead> <tr> <th>Value</th> <th>Description</th> </tr> </thead> <tbody> <tr> <td><code>Warning</code></td> <td>Displays a yellow warning HelpBox (default)</td> </tr> <tr> <td><code>Error</code></td> <td>Displays a red error HelpBox</td> </tr> </tbody> </table> <h3 id=constructor-overloads>Constructor Overloads<a class=headerlink href=#constructor-overloads title="Permanent link">¶</a></h3> <p>The <code>[WNotNull]</code> attribute supports multiple constructor overloads for flexibility:</p> <h4 id=default-warning>Default Warning<a class=headerlink href=#default-warning title="Permanent link">¶</a></h4> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-3-1>1</a></span>
<span class=normal><a href=#__codelineno-3-2>2</a></span>
<span class=normal><a href=#__codelineno-3-3>3</a></span>
<span class=normal><a href=#__codelineno-3-4>4</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-3-1><a id=__codelineno-3-1 name=__codelineno-3-1></a><span class=c1>// Default: warning message type with auto-generated message</span>
</span><span id=__span-3-2><a id=__codelineno-3-2 name=__codelineno-3-2></a><span class=na>[WNotNull]</span>
</span><span id=__span-3-3><a id=__codelineno-3-3 name=__codelineno-3-3></a><span class=k>public</span><span class=w> </span><span class=n>GameObject</span><span class=w> </span><span class=n>target</span><span class=p>;</span>
</span><span id=__span-3-4><a id=__codelineno-3-4 name=__codelineno-3-4></a><span class=c1>// Inspector shows: "target must be assigned"</span>
</span></code></pre></div></td></tr></table></div> <h4 id=specify-message-type>Specify Message Type<a class=headerlink href=#specify-message-type title="Permanent link">¶</a></h4> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-4-1>1</a></span>
<span class=normal><a href=#__codelineno-4-2>2</a></span>
<span class=normal><a href=#__codelineno-4-3>3</a></span>
<span class=normal><a href=#__codelineno-4-4>4</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-4-1><a id=__codelineno-4-1 name=__codelineno-4-1></a><span class=c1>// Error message type with auto-generated message</span>
</span><span id=__span-4-2><a id=__codelineno-4-2 name=__codelineno-4-2></a><span class=na>[WNotNull(WNotNullMessageType.Error)]</span>
</span><span id=__span-4-3><a id=__codelineno-4-3 name=__codelineno-4-3></a><span class=k>public</span><span class=w> </span><span class=n>AudioSource</span><span class=w> </span><span class=n>criticalAudioSource</span><span class=p>;</span>
</span><span id=__span-4-4><a id=__codelineno-4-4 name=__codelineno-4-4></a><span class=c1>// Inspector shows red error: "criticalAudioSource must be assigned"</span>
</span></code></pre></div></td></tr></table></div> <h4 id=custom-message>Custom Message<a class=headerlink href=#custom-message title="Permanent link">¶</a></h4> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-5-1>1</a></span>
<span class=normal><a href=#__codelineno-5-2>2</a></span>
<span class=normal><a href=#__codelineno-5-3>3</a></span>
<span class=normal><a href=#__codelineno-5-4>4</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-5-1><a id=__codelineno-5-1 name=__codelineno-5-1></a><span class=c1>// Warning with custom message</span>
</span><span id=__span-5-2><a id=__codelineno-5-2 name=__codelineno-5-2></a><span class=na>[WNotNull("Player needs a target to attack")]</span>
</span><span id=__span-5-3><a id=__codelineno-5-3 name=__codelineno-5-3></a><span class=k>public</span><span class=w> </span><span class=n>Transform</span><span class=w> </span><span class=n>attackTarget</span><span class=p>;</span>
</span><span id=__span-5-4><a id=__codelineno-5-4 name=__codelineno-5-4></a><span class=c1>// Inspector shows yellow warning: "Player needs a target to attack"</span>
</span></code></pre></div></td></tr></table></div> <h4 id=full-customization>Full Customization<a class=headerlink href=#full-customization title="Permanent link">¶</a></h4> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-6-1>1</a></span>
<span class=normal><a href=#__codelineno-6-2>2</a></span>
<span class=normal><a href=#__codelineno-6-3>3</a></span>
<span class=normal><a href=#__codelineno-6-4>4</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-6-1><a id=__codelineno-6-1 name=__codelineno-6-1></a><span class=c1>// Error with custom message</span>
</span><span id=__span-6-2><a id=__codelineno-6-2 name=__codelineno-6-2></a><span class=na>[WNotNull(WNotNullMessageType.Error, "Audio source is required for sound effects")]</span>
</span><span id=__span-6-3><a id=__codelineno-6-3 name=__codelineno-6-3></a><span class=k>public</span><span class=w> </span><span class=n>AudioSource</span><span class=w> </span><span class=n>audioSource</span><span class=p>;</span>
</span><span id=__span-6-4><a id=__codelineno-6-4 name=__codelineno-6-4></a><span class=c1>// Inspector shows red error: "Audio source is required for sound effects"</span>
</span></code></pre></div></td></tr></table></div> <h3 id=inspector-display-examples>Inspector Display Examples<a class=headerlink href=#inspector-display-examples title="Permanent link">¶</a></h3> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-7-1> 1</a></span>
<span class=normal><a href=#__codelineno-7-2> 2</a></span>
<span class=normal><a href=#__codelineno-7-3> 3</a></span>
<span class=normal><a href=#__codelineno-7-4> 4</a></span>
<span class=normal><a href=#__codelineno-7-5> 5</a></span>
<span class=normal><a href=#__codelineno-7-6> 6</a></span>
<span class=normal><a href=#__codelineno-7-7> 7</a></span>
<span class=normal><a href=#__codelineno-7-8> 8</a></span>
<span class=normal><a href=#__codelineno-7-9> 9</a></span>
<span class=normal><a href=#__codelineno-7-10>10</a></span>
<span class=normal><a href=#__codelineno-7-11>11</a></span>
<span class=normal><a href=#__codelineno-7-12>12</a></span>
<span class=normal><a href=#__codelineno-7-13>13</a></span>
<span class=normal><a href=#__codelineno-7-14>14</a></span>
<span class=normal><a href=#__codelineno-7-15>15</a></span>
<span class=normal><a href=#__codelineno-7-16>16</a></span>
<span class=normal><a href=#__codelineno-7-17>17</a></span>
<span class=normal><a href=#__codelineno-7-18>18</a></span>
<span class=normal><a href=#__codelineno-7-19>19</a></span>
<span class=normal><a href=#__codelineno-7-20>20</a></span>
<span class=normal><a href=#__codelineno-7-21>21</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-7-1><a id=__codelineno-7-1 name=__codelineno-7-1></a><span class=k>using</span><span class=w> </span><span class=nn>UnityEngine</span><span class=p>;</span>
</span><span id=__span-7-2><a id=__codelineno-7-2 name=__codelineno-7-2></a><span class=k>using</span><span class=w> </span><span class=nn>WallstopStudios.UnityHelpers.Core.Attributes</span><span class=p>;</span>
</span><span id=__span-7-3><a id=__codelineno-7-3 name=__codelineno-7-3></a>
</span><span id=__span-7-4><a id=__codelineno-7-4 name=__codelineno-7-4></a><span class=k>public</span><span class=w> </span><span class=k>class</span><span class=w> </span><span class=nc>EnemyAI</span><span class=w> </span><span class=p>:</span><span class=w> </span><span class=n>MonoBehaviour</span>
</span><span id=__span-7-5><a id=__codelineno-7-5 name=__codelineno-7-5></a><span class=p>{</span>
</span><span id=__span-7-6><a id=__codelineno-7-6 name=__codelineno-7-6></a><span class=w> </span><span class=c1>// Yellow warning - nice to have</span>
</span><span id=__span-7-7><a id=__codelineno-7-7 name=__codelineno-7-7></a><span class=w> </span><span class=na>[WNotNull]</span>
</span><span id=__span-7-8><a id=__codelineno-7-8 name=__codelineno-7-8></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>ParticleSystem</span><span class=w> </span><span class=n>hitEffect</span><span class=p>;</span>
</span><span id=__span-7-9><a id=__codelineno-7-9 name=__codelineno-7-9></a>
</span><span id=__span-7-10><a id=__codelineno-7-10 name=__codelineno-7-10></a><span class=w> </span><span class=c1>// Red error - critical reference</span>
</span><span id=__span-7-11><a id=__codelineno-7-11 name=__codelineno-7-11></a><span class=w> </span><span class=na>[WNotNull(WNotNullMessageType.Error)]</span>
</span><span id=__span-7-12><a id=__codelineno-7-12 name=__codelineno-7-12></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>Transform</span><span class=w> </span><span class=n>patrolPath</span><span class=p>;</span>
</span><span id=__span-7-13><a id=__codelineno-7-13 name=__codelineno-7-13></a>
</span><span id=__span-7-14><a id=__codelineno-7-14 name=__codelineno-7-14></a><span class=w> </span><span class=c1>// Warning with helpful context</span>
</span><span id=__span-7-15><a id=__codelineno-7-15 name=__codelineno-7-15></a><span class=w> </span><span class=na>[WNotNull("Assign the player tag or the enemy won't detect the player")]</span>
</span><span id=__span-7-16><a id=__codelineno-7-16 name=__codelineno-7-16></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=kt>string</span><span class=w> </span><span class=n>playerTag</span><span class=p>;</span>
</span><span id=__span-7-17><a id=__codelineno-7-17 name=__codelineno-7-17></a>
</span><span id=__span-7-18><a id=__codelineno-7-18 name=__codelineno-7-18></a><span class=w> </span><span class=c1>// Error with specific instructions</span>
</span><span id=__span-7-19><a id=__codelineno-7-19 name=__codelineno-7-19></a><span class=w> </span><span class=na>[WNotNull(WNotNullMessageType.Error, "Drag the NavMeshAgent component here - required for movement")]</span>
</span><span id=__span-7-20><a id=__codelineno-7-20 name=__codelineno-7-20></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>UnityEngine</span><span class=p>.</span><span class=n>AI</span><span class=p>.</span><span class=n>NavMeshAgent</span><span class=w> </span><span class=n>agent</span><span class=p>;</span>
</span><span id=__span-7-21><a id=__codelineno-7-21 name=__codelineno-7-21></a><span class=p>}</span>
</span></code></pre></div></td></tr></table></div> <blockquote> <p><strong>Visual Reference</strong></p> <p><img alt="WNotNull with different message types" src=../../../images/inspector/validation/wnotnull-message-types.png></p> <p><em>Warning (yellow) and Error (red) HelpBoxes for null fields in the inspector</em></p> </blockquote> <h3 id=runtime-validation-with-checkfornulls>Runtime Validation with CheckForNulls()<a class=headerlink href=#runtime-validation-with-checkfornulls title="Permanent link">¶</a></h3> <p>The <code>CheckForNulls()</code> extension method validates all <code>[WNotNull]</code> fields at runtime:</p> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-8-1> 1</a></span>
<span class=normal><a href=#__codelineno-8-2> 2</a></span>
<span class=normal><a href=#__codelineno-8-3> 3</a></span>
<span class=normal><a href=#__codelineno-8-4> 4</a></span>
<span class=normal><a href=#__codelineno-8-5> 5</a></span>
<span class=normal><a href=#__codelineno-8-6> 6</a></span>
<span class=normal><a href=#__codelineno-8-7> 7</a></span>
<span class=normal><a href=#__codelineno-8-8> 8</a></span>
<span class=normal><a href=#__codelineno-8-9> 9</a></span>
<span class=normal><a href=#__codelineno-8-10>10</a></span>
<span class=normal><a href=#__codelineno-8-11>11</a></span>
<span class=normal><a href=#__codelineno-8-12>12</a></span>
<span class=normal><a href=#__codelineno-8-13>13</a></span>
<span class=normal><a href=#__codelineno-8-14>14</a></span>
<span class=normal><a href=#__codelineno-8-15>15</a></span>
<span class=normal><a href=#__codelineno-8-16>16</a></span>
<span class=normal><a href=#__codelineno-8-17>17</a></span>
<span class=normal><a href=#__codelineno-8-18>18</a></span>
<span class=normal><a href=#__codelineno-8-19>19</a></span>
<span class=normal><a href=#__codelineno-8-20>20</a></span>
<span class=normal><a href=#__codelineno-8-21>21</a></span>
<span class=normal><a href=#__codelineno-8-22>22</a></span>
<span class=normal><a href=#__codelineno-8-23>23</a></span>
<span class=normal><a href=#__codelineno-8-24>24</a></span>
<span class=normal><a href=#__codelineno-8-25>25</a></span>
<span class=normal><a href=#__codelineno-8-26>26</a></span>
<span class=normal><a href=#__codelineno-8-27>27</a></span>
<span class=normal><a href=#__codelineno-8-28>28</a></span>
<span class=normal><a href=#__codelineno-8-29>29</a></span>
<span class=normal><a href=#__codelineno-8-30>30</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-8-1><a id=__codelineno-8-1 name=__codelineno-8-1></a><span class=k>using</span><span class=w> </span><span class=nn>UnityEngine</span><span class=p>;</span>
</span><span id=__span-8-2><a id=__codelineno-8-2 name=__codelineno-8-2></a><span class=k>using</span><span class=w> </span><span class=nn>WallstopStudios.UnityHelpers.Core.Attributes</span><span class=p>;</span>
</span><span id=__span-8-3><a id=__codelineno-8-3 name=__codelineno-8-3></a>
</span><span id=__span-8-4><a id=__codelineno-8-4 name=__codelineno-8-4></a><span class=k>public</span><span class=w> </span><span class=k>class</span><span class=w> </span><span class=nc>EnemySpawner</span><span class=w> </span><span class=p>:</span><span class=w> </span><span class=n>MonoBehaviour</span>
</span><span id=__span-8-5><a id=__codelineno-8-5 name=__codelineno-8-5></a><span class=p>{</span>
</span><span id=__span-8-6><a id=__codelineno-8-6 name=__codelineno-8-6></a><span class=w> </span><span class=na>[WNotNull]</span>
</span><span id=__span-8-7><a id=__codelineno-8-7 name=__codelineno-8-7></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>GameObject</span><span class=w> </span><span class=n>enemyPrefab</span><span class=p>;</span>
</span><span id=__span-8-8><a id=__codelineno-8-8 name=__codelineno-8-8></a>
</span><span id=__span-8-9><a id=__codelineno-8-9 name=__codelineno-8-9></a><span class=w> </span><span class=na>[WNotNull]</span>
</span><span id=__span-8-10><a id=__codelineno-8-10 name=__codelineno-8-10></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>Transform</span><span class=w> </span><span class=n>spawnPoint</span><span class=p>;</span>
</span><span id=__span-8-11><a id=__codelineno-8-11 name=__codelineno-8-11></a>
</span><span id=__span-8-12><a id=__codelineno-8-12 name=__codelineno-8-12></a><span class=w> </span><span class=na>[WNotNull(WNotNullMessageType.Error)]</span>
</span><span id=__span-8-13><a id=__codelineno-8-13 name=__codelineno-8-13></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>EnemyManager</span><span class=w> </span><span class=n>enemyManager</span><span class=p>;</span>
</span><span id=__span-8-14><a id=__codelineno-8-14 name=__codelineno-8-14></a>
</span><span id=__span-8-15><a id=__codelineno-8-15 name=__codelineno-8-15></a><span class=w> </span><span class=k>private</span><span class=w> </span><span class=k>void</span><span class=w> </span><span class=nf>Start</span><span class=p>()</span>
</span><span id=__span-8-16><a id=__codelineno-8-16 name=__codelineno-8-16></a><span class=w> </span><span class=p>{</span>
</span><span id=__span-8-17><a id=__codelineno-8-17 name=__codelineno-8-17></a><span class=w> </span><span class=c1>// If any [WNotNull] field is null, this throws with the field name</span>
</span><span id=__span-8-18><a id=__codelineno-8-18 name=__codelineno-8-18></a><span class=w> </span><span class=c1>// Example: ArgumentNullException("enemyPrefab")</span>
</span><span id=__span-8-19><a id=__codelineno-8-19 name=__codelineno-8-19></a><span class=w> </span><span class=k>this</span><span class=p>.</span><span class=n>CheckForNulls</span><span class=p>();</span>
</span><span id=__span-8-20><a id=__codelineno-8-20 name=__codelineno-8-20></a>
</span><span id=__span-8-21><a id=__codelineno-8-21 name=__codelineno-8-21></a><span class=w> </span><span class=c1>// Safe to use - we know these are assigned</span>
</span><span id=__span-8-22><a id=__codelineno-8-22 name=__codelineno-8-22></a><span class=w> </span><span class=n>SpawnEnemy</span><span class=p>();</span>
</span><span id=__span-8-23><a id=__codelineno-8-23 name=__codelineno-8-23></a><span class=w> </span><span class=p>}</span>
</span><span id=__span-8-24><a id=__codelineno-8-24 name=__codelineno-8-24></a>
</span><span id=__span-8-25><a id=__codelineno-8-25 name=__codelineno-8-25></a><span class=w> </span><span class=k>private</span><span class=w> </span><span class=k>void</span><span class=w> </span><span class=nf>SpawnEnemy</span><span class=p>()</span>
</span><span id=__span-8-26><a id=__codelineno-8-26 name=__codelineno-8-26></a><span class=w> </span><span class=p>{</span>
</span><span id=__span-8-27><a id=__codelineno-8-27 name=__codelineno-8-27></a><span class=w> </span><span class=n>GameObject</span><span class=w> </span><span class=n>enemy</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=n>Instantiate</span><span class=p>(</span><span class=n>enemyPrefab</span><span class=p>,</span><span class=w> </span><span class=n>spawnPoint</span><span class=p>.</span><span class=n>position</span><span class=p>,</span><span class=w> </span><span class=n>Quaternion</span><span class=p>.</span><span class=n>identity</span><span class=p>);</span>
</span><span id=__span-8-28><a id=__codelineno-8-28 name=__codelineno-8-28></a><span class=w> </span><span class=n>enemyManager</span><span class=p>.</span><span class=n>RegisterEnemy</span><span class=p>(</span><span class=n>enemy</span><span class=p>);</span>
</span><span id=__span-8-29><a id=__codelineno-8-29 name=__codelineno-8-29></a><span class=w> </span><span class=p>}</span>
</span><span id=__span-8-30><a id=__codelineno-8-30 name=__codelineno-8-30></a><span class=p>}</span>
</span></code></pre></div></td></tr></table></div> <h3 id=editor-only-validation>Editor-Only Validation<a class=headerlink href=#editor-only-validation title="Permanent link">¶</a></h3> <p>Both the inspector HelpBox display and the <code>CheckForNulls()</code> extension method are only active in the Unity Editor:</p> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-9-1>1</a></span>
<span class=normal><a href=#__codelineno-9-2>2</a></span>
<span class=normal><a href=#__codelineno-9-3>3</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-9-1><a id=__codelineno-9-1 name=__codelineno-9-1></a><span class=c1>// The validation code only runs in UNITY_EDITOR</span>
</span><span id=__span-9-2><a id=__codelineno-9-2 name=__codelineno-9-2></a><span class=c1>// In builds, CheckForNulls() does nothing (stripped for performance)</span>
</span><span id=__span-9-3><a id=__codelineno-9-3 name=__codelineno-9-3></a><span class=k>this</span><span class=p>.</span><span class=n>CheckForNulls</span><span class=p>();</span>
</span></code></pre></div></td></tr></table></div> <p>This means:</p> <ul> <li><strong>Development</strong>: Visual feedback in inspector + runtime null checking with detailed exception messages</li> <li><strong>Production</strong>: Zero runtime cost (all validation code is stripped)</li> </ul> <h3 id=combining-with-other-attributes>Combining with Other Attributes<a class=headerlink href=#combining-with-other-attributes title="Permanent link">¶</a></h3> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-10-1> 1</a></span>
<span class=normal><a href=#__codelineno-10-2> 2</a></span>
<span class=normal><a href=#__codelineno-10-3> 3</a></span>
<span class=normal><a href=#__codelineno-10-4> 4</a></span>
<span class=normal><a href=#__codelineno-10-5> 5</a></span>
<span class=normal><a href=#__codelineno-10-6> 6</a></span>
<span class=normal><a href=#__codelineno-10-7> 7</a></span>
<span class=normal><a href=#__codelineno-10-8> 8</a></span>
<span class=normal><a href=#__codelineno-10-9> 9</a></span>
<span class=normal><a href=#__codelineno-10-10>10</a></span>
<span class=normal><a href=#__codelineno-10-11>11</a></span>
<span class=normal><a href=#__codelineno-10-12>12</a></span>
<span class=normal><a href=#__codelineno-10-13>13</a></span>
<span class=normal><a href=#__codelineno-10-14>14</a></span>
<span class=normal><a href=#__codelineno-10-15>15</a></span>
<span class=normal><a href=#__codelineno-10-16>16</a></span>
<span class=normal><a href=#__codelineno-10-17>17</a></span>
<span class=normal><a href=#__codelineno-10-18>18</a></span>
<span class=normal><a href=#__codelineno-10-19>19</a></span>
<span class=normal><a href=#__codelineno-10-20>20</a></span>
<span class=normal><a href=#__codelineno-10-21>21</a></span>
<span class=normal><a href=#__codelineno-10-22>22</a></span>
<span class=normal><a href=#__codelineno-10-23>23</a></span>
<span class=normal><a href=#__codelineno-10-24>24</a></span>
<span class=normal><a href=#__codelineno-10-25>25</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-10-1><a id=__codelineno-10-1 name=__codelineno-10-1></a><span class=k>public</span><span class=w> </span><span class=k>class</span><span class=w> </span><span class=nc>UIManager</span><span class=w> </span><span class=p>:</span><span class=w> </span><span class=n>MonoBehaviour</span>
</span><span id=__span-10-2><a id=__codelineno-10-2 name=__codelineno-10-2></a><span class=p>{</span>
</span><span id=__span-10-3><a id=__codelineno-10-3 name=__codelineno-10-3></a><span class=w> </span><span class=c1>// Required reference with error severity - validated at runtime</span>
</span><span id=__span-10-4><a id=__codelineno-10-4 name=__codelineno-10-4></a><span class=w> </span><span class=na>[WNotNull(WNotNullMessageType.Error)]</span>
</span><span id=__span-10-5><a id=__codelineno-10-5 name=__codelineno-10-5></a><span class=w> </span><span class=na>[SerializeField]</span>
</span><span id=__span-10-6><a id=__codelineno-10-6 name=__codelineno-10-6></a><span class=w> </span><span class=k>private</span><span class=w> </span><span class=n>Canvas</span><span class=w> </span><span class=n>mainCanvas</span><span class=p>;</span>
</span><span id=__span-10-7><a id=__codelineno-10-7 name=__codelineno-10-7></a>
</span><span id=__span-10-8><a id=__codelineno-10-8 name=__codelineno-10-8></a><span class=w> </span><span class=c1>// Optional reference - not validated</span>
</span><span id=__span-10-9><a id=__codelineno-10-9 name=__codelineno-10-9></a><span class=w> </span><span class=na>[SerializeField]</span>
</span><span id=__span-10-10><a id=__codelineno-10-10 name=__codelineno-10-10></a><span class=w> </span><span class=k>private</span><span class=w> </span><span class=n>AudioSource</span><span class=w> </span><span class=n>clickSound</span><span class=p>;</span>
</span><span id=__span-10-11><a id=__codelineno-10-11 name=__codelineno-10-11></a>
</span><span id=__span-10-12><a id=__codelineno-10-12 name=__codelineno-10-12></a><span class=w> </span><span class=c1>// Read-only and required</span>
</span><span id=__span-10-13><a id=__codelineno-10-13 name=__codelineno-10-13></a><span class=w> </span><span class=na>[WReadOnly]</span>
</span><span id=__span-10-14><a id=__codelineno-10-14 name=__codelineno-10-14></a><span class=w> </span><span class=na>[WNotNull]</span>
</span><span id=__span-10-15><a id=__codelineno-10-15 name=__codelineno-10-15></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>RectTransform</span><span class=w> </span><span class=n>cachedRect</span><span class=p>;</span>
</span><span id=__span-10-16><a id=__codelineno-10-16 name=__codelineno-10-16></a>
</span><span id=__span-10-17><a id=__codelineno-10-17 name=__codelineno-10-17></a><span class=w> </span><span class=c1>// Group with validation and custom message</span>
</span><span id=__span-10-18><a id=__codelineno-10-18 name=__codelineno-10-18></a><span class=w> </span><span class=na>[WGroup("UI Elements")]</span>
</span><span id=__span-10-19><a id=__codelineno-10-19 name=__codelineno-10-19></a><span class=w> </span><span class=na>[WNotNull("Start button required for main menu")]</span>
</span><span id=__span-10-20><a id=__codelineno-10-20 name=__codelineno-10-20></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>Button</span><span class=w> </span><span class=n>startButton</span><span class=p>;</span><span class=w> </span><span class=c1>// In group</span>
</span><span id=__span-10-21><a id=__codelineno-10-21 name=__codelineno-10-21></a>
</span><span id=__span-10-22><a id=__codelineno-10-22 name=__codelineno-10-22></a><span class=w> </span><span class=na>[WNotNull(WNotNullMessageType.Error, "Quit button required for main menu")]</span>
</span><span id=__span-10-23><a id=__codelineno-10-23 name=__codelineno-10-23></a><span class=w> </span><span class=na>[WGroupEnd("UI Elements")]</span><span class=w> </span><span class=c1>// quitButton IS included, then closes</span>
</span><span id=__span-10-24><a id=__codelineno-10-24 name=__codelineno-10-24></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>Button</span><span class=w> </span><span class=n>quitButton</span><span class=p>;</span><span class=w> </span><span class=c1>// In group (last field)</span>
</span><span id=__span-10-25><a id=__codelineno-10-25 name=__codelineno-10-25></a><span class=p>}</span>
</span></code></pre></div></td></tr></table></div> <p><strong>Why Use WNotNull:</strong></p> <ul> <li><strong>Visual feedback</strong>: See missing references immediately in the inspector without running the game</li> <li><strong>Severity control</strong>: Use warnings for nice-to-have references, errors for critical ones</li> <li><strong>Custom messages</strong>: Provide helpful context about why a reference is needed</li> <li><strong>Early failure</strong>: Catch missing references at game start with <code>CheckForNulls()</code>, not when first used</li> <li><strong>Clear errors</strong>: Get the exact field name in the exception message</li> <li><strong>Documentation</strong>: Make required references explicit in code</li> <li><strong>Zero runtime cost</strong>: All validation stripped from builds</li> </ul> <hr> <h2 id=validateassignment>ValidateAssignment<a class=headerlink href=#validateassignment title="Permanent link">¶</a></h2> <p>Validates that a field is properly assigned, providing <strong>visual inspector feedback</strong> when validation fails. Unlike <code>[WNotNull]</code> which only checks for null references, <code>[ValidateAssignment]</code> validates that fields are "properly assigned" based on their type—including checking for empty strings, empty collections, and null references.</p> <h3 id=what-validateassignment-validates>What ValidateAssignment Validates<a class=headerlink href=#what-validateassignment-validates title="Permanent link">¶</a></h3> <table> <thead> <tr> <th>Field Type</th> <th>Validation Rule</th> </tr> </thead> <tbody> <tr> <td>Unity <code>Object</code> references</td> <td>Not null</td> </tr> <tr> <td>Strings</td> <td>Not null or whitespace</td> </tr> <tr> <td><code>IList</code> (arrays, List<t>)</td> <td>Has at least one element</td> </tr> <tr> <td><code>ICollection</code></td> <td>Has at least one element</td> </tr> <tr> <td><code>IEnumerable</code></td> <td>Has at least one element</td> </tr> <tr> <td>Other types</td> <td>Not null</td> </tr> </tbody> </table> <h3 id=basic-usage_2>Basic Usage<a class=headerlink href=#basic-usage_2 title="Permanent link">¶</a></h3> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-11-1> 1</a></span>
<span class=normal><a href=#__codelineno-11-2> 2</a></span>
<span class=normal><a href=#__codelineno-11-3> 3</a></span>
<span class=normal><a href=#__codelineno-11-4> 4</a></span>
<span class=normal><a href=#__codelineno-11-5> 5</a></span>
<span class=normal><a href=#__codelineno-11-6> 6</a></span>
<span class=normal><a href=#__codelineno-11-7> 7</a></span>
<span class=normal><a href=#__codelineno-11-8> 8</a></span>
<span class=normal><a href=#__codelineno-11-9> 9</a></span>
<span class=normal><a href=#__codelineno-11-10>10</a></span>
<span class=normal><a href=#__codelineno-11-11>11</a></span>
<span class=normal><a href=#__codelineno-11-12>12</a></span>
<span class=normal><a href=#__codelineno-11-13>13</a></span>
<span class=normal><a href=#__codelineno-11-14>14</a></span>
<span class=normal><a href=#__codelineno-11-15>15</a></span>
<span class=normal><a href=#__codelineno-11-16>16</a></span>
<span class=normal><a href=#__codelineno-11-17>17</a></span>
<span class=normal><a href=#__codelineno-11-18>18</a></span>
<span class=normal><a href=#__codelineno-11-19>19</a></span>
<span class=normal><a href=#__codelineno-11-20>20</a></span>
<span class=normal><a href=#__codelineno-11-21>21</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-11-1><a id=__codelineno-11-1 name=__codelineno-11-1></a><span class=k>using</span><span class=w> </span><span class=nn>System.Collections.Generic</span><span class=p>;</span>
</span><span id=__span-11-2><a id=__codelineno-11-2 name=__codelineno-11-2></a><span class=k>using</span><span class=w> </span><span class=nn>UnityEngine</span><span class=p>;</span>
</span><span id=__span-11-3><a id=__codelineno-11-3 name=__codelineno-11-3></a><span class=k>using</span><span class=w> </span><span class=nn>WallstopStudios.UnityHelpers.Core.Attributes</span><span class=p>;</span>
</span><span id=__span-11-4><a id=__codelineno-11-4 name=__codelineno-11-4></a>
</span><span id=__span-11-5><a id=__codelineno-11-5 name=__codelineno-11-5></a><span class=k>public</span><span class=w> </span><span class=k>class</span><span class=w> </span><span class=nc>EnemySpawner</span><span class=w> </span><span class=p>:</span><span class=w> </span><span class=n>MonoBehaviour</span>
</span><span id=__span-11-6><a id=__codelineno-11-6 name=__codelineno-11-6></a><span class=p>{</span>
</span><span id=__span-11-7><a id=__codelineno-11-7 name=__codelineno-11-7></a><span class=w> </span><span class=na>[ValidateAssignment]</span>
</span><span id=__span-11-8><a id=__codelineno-11-8 name=__codelineno-11-8></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>GameObject</span><span class=w> </span><span class=n>enemyPrefab</span><span class=p>;</span>
</span><span id=__span-11-9><a id=__codelineno-11-9 name=__codelineno-11-9></a>
</span><span id=__span-11-10><a id=__codelineno-11-10 name=__codelineno-11-10></a><span class=w> </span><span class=na>[ValidateAssignment]</span>
</span><span id=__span-11-11><a id=__codelineno-11-11 name=__codelineno-11-11></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=kt>string</span><span class=w> </span><span class=n>enemyName</span><span class=p>;</span>
</span><span id=__span-11-12><a id=__codelineno-11-12 name=__codelineno-11-12></a>
</span><span id=__span-11-13><a id=__codelineno-11-13 name=__codelineno-11-13></a><span class=w> </span><span class=na>[ValidateAssignment]</span>
</span><span id=__span-11-14><a id=__codelineno-11-14 name=__codelineno-11-14></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>List</span><span class=o><</span><span class=n>Transform</span><span class=o>></span><span class=w> </span><span class=n>spawnPoints</span><span class=p>;</span>
</span><span id=__span-11-15><a id=__codelineno-11-15 name=__codelineno-11-15></a>
</span><span id=__span-11-16><a id=__codelineno-11-16 name=__codelineno-11-16></a><span class=w> </span><span class=k>private</span><span class=w> </span><span class=k>void</span><span class=w> </span><span class=nf>Start</span><span class=p>()</span>
</span><span id=__span-11-17><a id=__codelineno-11-17 name=__codelineno-11-17></a><span class=w> </span><span class=p>{</span>
</span><span id=__span-11-18><a id=__codelineno-11-18 name=__codelineno-11-18></a><span class=w> </span><span class=c1>// Logs warnings for any invalid [ValidateAssignment] fields</span>
</span><span id=__span-11-19><a id=__codelineno-11-19 name=__codelineno-11-19></a><span class=w> </span><span class=k>this</span><span class=p>.</span><span class=n>ValidateAssignments</span><span class=p>();</span>
</span><span id=__span-11-20><a id=__codelineno-11-20 name=__codelineno-11-20></a><span class=w> </span><span class=p>}</span>
</span><span id=__span-11-21><a id=__codelineno-11-21 name=__codelineno-11-21></a><span class=p>}</span>
</span></code></pre></div></td></tr></table></div> <p><strong>Behavior:</strong></p> <ul> <li><strong>Inspector feedback</strong>: Displays a HelpBox warning (yellow) or error (red) when the field is invalid</li> <li><strong>Runtime validation</strong>: Call <code>this.ValidateAssignments()</code> to log warnings for invalid fields</li> <li><strong>Programmatic checking</strong>: Call <code>this.AreAnyAssignmentsInvalid()</code> to check if any fields are invalid</li> <li>Works with Unity <code>Object</code> types, strings, collections, and any reference type</li> <li>Inspector validation runs <strong>only in the Unity Editor</strong> (stripped in builds for performance)</li> </ul> <blockquote> <p><strong>Visual Reference</strong></p> <p><img alt="ValidateAssignment fields in inspector with invalid values highlighted" src=../../../images/inspector/validation/validateassignment-inspector.png></p> <p><em>Fields marked with [ValidateAssignment] display a HelpBox in the inspector when invalid</em></p> </blockquote> <h3 id=validateassignmentmessagetype-enum>ValidateAssignmentMessageType Enum<a class=headerlink href=#validateassignmentmessagetype-enum title="Permanent link">¶</a></h3> <p>The <code>ValidateAssignmentMessageType</code> enum controls how invalid fields are displayed in the inspector:</p> <table> <thead> <tr> <th>Value</th> <th>Description</th> </tr> </thead> <tbody> <tr> <td><code>Warning</code></td> <td>Displays a yellow warning HelpBox (default)</td> </tr> <tr> <td><code>Error</code></td> <td>Displays a red error HelpBox</td> </tr> </tbody> </table> <h3 id=constructor-overloads_1>Constructor Overloads<a class=headerlink href=#constructor-overloads_1 title="Permanent link">¶</a></h3> <p>The <code>[ValidateAssignment]</code> attribute supports multiple constructor overloads for flexibility:</p> <h4 id=default-warning_1>Default Warning<a class=headerlink href=#default-warning_1 title="Permanent link">¶</a></h4> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-12-1>1</a></span>
<span class=normal><a href=#__codelineno-12-2>2</a></span>
<span class=normal><a href=#__codelineno-12-3>3</a></span>
<span class=normal><a href=#__codelineno-12-4>4</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-12-1><a id=__codelineno-12-1 name=__codelineno-12-1></a><span class=c1>// Default: warning message type with auto-generated message</span>
</span><span id=__span-12-2><a id=__codelineno-12-2 name=__codelineno-12-2></a><span class=na>[ValidateAssignment]</span>
</span><span id=__span-12-3><a id=__codelineno-12-3 name=__codelineno-12-3></a><span class=k>public</span><span class=w> </span><span class=n>GameObject</span><span class=w> </span><span class=n>target</span><span class=p>;</span>
</span><span id=__span-12-4><a id=__codelineno-12-4 name=__codelineno-12-4></a><span class=c1>// Inspector shows: "target must be assigned"</span>
</span></code></pre></div></td></tr></table></div> <h4 id=specify-message-type_1>Specify Message Type<a class=headerlink href=#specify-message-type_1 title="Permanent link">¶</a></h4> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-13-1>1</a></span>
<span class=normal><a href=#__codelineno-13-2>2</a></span>
<span class=normal><a href=#__codelineno-13-3>3</a></span>
<span class=normal><a href=#__codelineno-13-4>4</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-13-1><a id=__codelineno-13-1 name=__codelineno-13-1></a><span class=c1>// Error message type with auto-generated message</span>
</span><span id=__span-13-2><a id=__codelineno-13-2 name=__codelineno-13-2></a><span class=na>[ValidateAssignment(ValidateAssignmentMessageType.Error)]</span>
</span><span id=__span-13-3><a id=__codelineno-13-3 name=__codelineno-13-3></a><span class=k>public</span><span class=w> </span><span class=n>AudioSource</span><span class=w> </span><span class=n>criticalAudioSource</span><span class=p>;</span>
</span><span id=__span-13-4><a id=__codelineno-13-4 name=__codelineno-13-4></a><span class=c1>// Inspector shows red error: "criticalAudioSource must be assigned"</span>
</span></code></pre></div></td></tr></table></div> <h4 id=custom-message_1>Custom Message<a class=headerlink href=#custom-message_1 title="Permanent link">¶</a></h4> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-14-1>1</a></span>
<span class=normal><a href=#__codelineno-14-2>2</a></span>
<span class=normal><a href=#__codelineno-14-3>3</a></span>
<span class=normal><a href=#__codelineno-14-4>4</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-14-1><a id=__codelineno-14-1 name=__codelineno-14-1></a><span class=c1>// Warning with custom message</span>
</span><span id=__span-14-2><a id=__codelineno-14-2 name=__codelineno-14-2></a><span class=na>[ValidateAssignment("Enemy name is required for UI display")]</span>
</span><span id=__span-14-3><a id=__codelineno-14-3 name=__codelineno-14-3></a><span class=k>public</span><span class=w> </span><span class=kt>string</span><span class=w> </span><span class=n>enemyName</span><span class=p>;</span>
</span><span id=__span-14-4><a id=__codelineno-14-4 name=__codelineno-14-4></a><span class=c1>// Inspector shows yellow warning: "Enemy name is required for UI display"</span>
</span></code></pre></div></td></tr></table></div> <h4 id=full-customization_1>Full Customization<a class=headerlink href=#full-customization_1 title="Permanent link">¶</a></h4> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-15-1>1</a></span>
<span class=normal><a href=#__codelineno-15-2>2</a></span>
<span class=normal><a href=#__codelineno-15-3>3</a></span>
<span class=normal><a href=#__codelineno-15-4>4</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-15-1><a id=__codelineno-15-1 name=__codelineno-15-1></a><span class=c1>// Error with custom message</span>
</span><span id=__span-15-2><a id=__codelineno-15-2 name=__codelineno-15-2></a><span class=na>[ValidateAssignment(ValidateAssignmentMessageType.Error, "Spawn points list cannot be empty")]</span>
</span><span id=__span-15-3><a id=__codelineno-15-3 name=__codelineno-15-3></a><span class=k>public</span><span class=w> </span><span class=n>List</span><span class=o><</span><span class=n>Transform</span><span class=o>></span><span class=w> </span><span class=n>spawnPoints</span><span class=p>;</span>
</span><span id=__span-15-4><a id=__codelineno-15-4 name=__codelineno-15-4></a><span class=c1>// Inspector shows red error: "Spawn points list cannot be empty"</span>
</span></code></pre></div></td></tr></table></div> <h3 id=inspector-display-examples_1>Inspector Display Examples<a class=headerlink href=#inspector-display-examples_1 title="Permanent link">¶</a></h3> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-16-1> 1</a></span>
<span class=normal><a href=#__codelineno-16-2> 2</a></span>
<span class=normal><a href=#__codelineno-16-3> 3</a></span>
<span class=normal><a href=#__codelineno-16-4> 4</a></span>
<span class=normal><a href=#__codelineno-16-5> 5</a></span>
<span class=normal><a href=#__codelineno-16-6> 6</a></span>
<span class=normal><a href=#__codelineno-16-7> 7</a></span>
<span class=normal><a href=#__codelineno-16-8> 8</a></span>
<span class=normal><a href=#__codelineno-16-9> 9</a></span>
<span class=normal><a href=#__codelineno-16-10>10</a></span>
<span class=normal><a href=#__codelineno-16-11>11</a></span>
<span class=normal><a href=#__codelineno-16-12>12</a></span>
<span class=normal><a href=#__codelineno-16-13>13</a></span>
<span class=normal><a href=#__codelineno-16-14>14</a></span>
<span class=normal><a href=#__codelineno-16-15>15</a></span>
<span class=normal><a href=#__codelineno-16-16>16</a></span>
<span class=normal><a href=#__codelineno-16-17>17</a></span>
<span class=normal><a href=#__codelineno-16-18>18</a></span>
<span class=normal><a href=#__codelineno-16-19>19</a></span>
<span class=normal><a href=#__codelineno-16-20>20</a></span>
<span class=normal><a href=#__codelineno-16-21>21</a></span>
<span class=normal><a href=#__codelineno-16-22>22</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-16-1><a id=__codelineno-16-1 name=__codelineno-16-1></a><span class=k>using</span><span class=w> </span><span class=nn>UnityEngine</span><span class=p>;</span>
</span><span id=__span-16-2><a id=__codelineno-16-2 name=__codelineno-16-2></a><span class=k>using</span><span class=w> </span><span class=nn>WallstopStudios.UnityHelpers.Core.Attributes</span><span class=p>;</span>
</span><span id=__span-16-3><a id=__codelineno-16-3 name=__codelineno-16-3></a><span class=k>using</span><span class=w> </span><span class=nn>System.Collections.Generic</span><span class=p>;</span>
</span><span id=__span-16-4><a id=__codelineno-16-4 name=__codelineno-16-4></a>
</span><span id=__span-16-5><a id=__codelineno-16-5 name=__codelineno-16-5></a><span class=k>public</span><span class=w> </span><span class=k>class</span><span class=w> </span><span class=nc>GameConfig</span><span class=w> </span><span class=p>:</span><span class=w> </span><span class=n>MonoBehaviour</span>
</span><span id=__span-16-6><a id=__codelineno-16-6 name=__codelineno-16-6></a><span class=p>{</span>
</span><span id=__span-16-7><a id=__codelineno-16-7 name=__codelineno-16-7></a><span class=w> </span><span class=c1>// Yellow warning - validates not null</span>
</span><span id=__span-16-8><a id=__codelineno-16-8 name=__codelineno-16-8></a><span class=w> </span><span class=na>[ValidateAssignment]</span>
</span><span id=__span-16-9><a id=__codelineno-16-9 name=__codelineno-16-9></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>GameObject</span><span class=w> </span><span class=n>playerPrefab</span><span class=p>;</span>
</span><span id=__span-16-10><a id=__codelineno-16-10 name=__codelineno-16-10></a>
</span><span id=__span-16-11><a id=__codelineno-16-11 name=__codelineno-16-11></a><span class=w> </span><span class=c1>// Red error - validates string not empty/whitespace</span>
</span><span id=__span-16-12><a id=__codelineno-16-12 name=__codelineno-16-12></a><span class=w> </span><span class=na>[ValidateAssignment(ValidateAssignmentMessageType.Error)]</span>
</span><span id=__span-16-13><a id=__codelineno-16-13 name=__codelineno-16-13></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=kt>string</span><span class=w> </span><span class=n>gameTitle</span><span class=p>;</span>
</span><span id=__span-16-14><a id=__codelineno-16-14 name=__codelineno-16-14></a>
</span><span id=__span-16-15><a id=__codelineno-16-15 name=__codelineno-16-15></a><span class=w> </span><span class=c1>// Warning with helpful context - validates list not empty</span>
</span><span id=__span-16-16><a id=__codelineno-16-16 name=__codelineno-16-16></a><span class=w> </span><span class=na>[ValidateAssignment("Add at least one difficulty level")]</span>
</span><span id=__span-16-17><a id=__codelineno-16-17 name=__codelineno-16-17></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>List</span><span class=o><</span><span class=kt>string</span><span class=o>></span><span class=w> </span><span class=n>difficultyLevels</span><span class=p>;</span>
</span><span id=__span-16-18><a id=__codelineno-16-18 name=__codelineno-16-18></a>
</span><span id=__span-16-19><a id=__codelineno-16-19 name=__codelineno-16-19></a><span class=w> </span><span class=c1>// Error with specific instructions - validates array not empty</span>
</span><span id=__span-16-20><a id=__codelineno-16-20 name=__codelineno-16-20></a><span class=w> </span><span class=na>[ValidateAssignment(ValidateAssignmentMessageType.Error, "Spawn points are required - add Transform references")]</span>
</span><span id=__span-16-21><a id=__codelineno-16-21 name=__codelineno-16-21></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>Transform</span><span class=p>[]</span><span class=w> </span><span class=n>spawnPoints</span><span class=p>;</span>
</span><span id=__span-16-22><a id=__codelineno-16-22 name=__codelineno-16-22></a><span class=p>}</span>
</span></code></pre></div></td></tr></table></div> <blockquote> <p><strong>Visual Reference</strong></p> <p><img alt="ValidateAssignment with different field types and message types" src=../../../images/inspector/validation/validateassignment-message-types.png></p> <p><em>Warning (yellow) and Error (red) HelpBoxes for various invalid field types</em></p> </blockquote> <h3 id=runtime-validation-methods>Runtime Validation Methods<a class=headerlink href=#runtime-validation-methods title="Permanent link">¶</a></h3> <p>Two extension methods are available for runtime validation of <code>[ValidateAssignment]</code> fields:</p> <h4 id=validateassignments>ValidateAssignments()<a class=headerlink href=#validateassignments title="Permanent link">¶</a></h4> <p>Logs warnings to the console for all invalid fields:</p> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-17-1> 1</a></span>
<span class=normal><a href=#__codelineno-17-2> 2</a></span>
<span class=normal><a href=#__codelineno-17-3> 3</a></span>
<span class=normal><a href=#__codelineno-17-4> 4</a></span>
<span class=normal><a href=#__codelineno-17-5> 5</a></span>
<span class=normal><a href=#__codelineno-17-6> 6</a></span>
<span class=normal><a href=#__codelineno-17-7> 7</a></span>
<span class=normal><a href=#__codelineno-17-8> 8</a></span>
<span class=normal><a href=#__codelineno-17-9> 9</a></span>
<span class=normal><a href=#__codelineno-17-10>10</a></span>
<span class=normal><a href=#__codelineno-17-11>11</a></span>
<span class=normal><a href=#__codelineno-17-12>12</a></span>
<span class=normal><a href=#__codelineno-17-13>13</a></span>
<span class=normal><a href=#__codelineno-17-14>14</a></span>
<span class=normal><a href=#__codelineno-17-15>15</a></span>
<span class=normal><a href=#__codelineno-17-16>16</a></span>
<span class=normal><a href=#__codelineno-17-17>17</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-17-1><a id=__codelineno-17-1 name=__codelineno-17-1></a><span class=k>using</span><span class=w> </span><span class=nn>UnityEngine</span><span class=p>;</span>
</span><span id=__span-17-2><a id=__codelineno-17-2 name=__codelineno-17-2></a><span class=k>using</span><span class=w> </span><span class=nn>WallstopStudios.UnityHelpers.Core.Attributes</span><span class=p>;</span>
</span><span id=__span-17-3><a id=__codelineno-17-3 name=__codelineno-17-3></a>
</span><span id=__span-17-4><a id=__codelineno-17-4 name=__codelineno-17-4></a><span class=k>public</span><span class=w> </span><span class=k>class</span><span class=w> </span><span class=nc>LevelManager</span><span class=w> </span><span class=p>:</span><span class=w> </span><span class=n>MonoBehaviour</span>
</span><span id=__span-17-5><a id=__codelineno-17-5 name=__codelineno-17-5></a><span class=p>{</span>
</span><span id=__span-17-6><a id=__codelineno-17-6 name=__codelineno-17-6></a><span class=w> </span><span class=na>[ValidateAssignment]</span>
</span><span id=__span-17-7><a id=__codelineno-17-7 name=__codelineno-17-7></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>GameObject</span><span class=p>[]</span><span class=w> </span><span class=n>enemyPrefabs</span><span class=p>;</span>
</span><span id=__span-17-8><a id=__codelineno-17-8 name=__codelineno-17-8></a>
</span><span id=__span-17-9><a id=__codelineno-17-9 name=__codelineno-17-9></a><span class=w> </span><span class=na>[ValidateAssignment]</span>
</span><span id=__span-17-10><a id=__codelineno-17-10 name=__codelineno-17-10></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=kt>string</span><span class=w> </span><span class=n>levelName</span><span class=p>;</span>
</span><span id=__span-17-11><a id=__codelineno-17-11 name=__codelineno-17-11></a>
</span><span id=__span-17-12><a id=__codelineno-17-12 name=__codelineno-17-12></a><span class=w> </span><span class=k>private</span><span class=w> </span><span class=k>void</span><span class=w> </span><span class=nf>Start</span><span class=p>()</span>
</span><span id=__span-17-13><a id=__codelineno-17-13 name=__codelineno-17-13></a><span class=w> </span><span class=p>{</span>
</span><span id=__span-17-14><a id=__codelineno-17-14 name=__codelineno-17-14></a><span class=w> </span><span class=c1>// Logs a warning for each invalid [ValidateAssignment] field</span>
</span><span id=__span-17-15><a id=__codelineno-17-15 name=__codelineno-17-15></a><span class=w> </span><span class=k>this</span><span class=p>.</span><span class=n>ValidateAssignments</span><span class=p>();</span>
</span><span id=__span-17-16><a id=__codelineno-17-16 name=__codelineno-17-16></a><span class=w> </span><span class=p>}</span>
</span><span id=__span-17-17><a id=__codelineno-17-17 name=__codelineno-17-17></a><span class=p>}</span>
</span></code></pre></div></td></tr></table></div> <h4 id=areanyassignmentsinvalid>AreAnyAssignmentsInvalid()<a class=headerlink href=#areanyassignmentsinvalid title="Permanent link">¶</a></h4> <p>Returns <code>true</code> if any <code>[ValidateAssignment]</code> field is invalid:</p> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-18-1> 1</a></span>
<span class=normal><a href=#__codelineno-18-2> 2</a></span>
<span class=normal><a href=#__codelineno-18-3> 3</a></span>
<span class=normal><a href=#__codelineno-18-4> 4</a></span>
<span class=normal><a href=#__codelineno-18-5> 5</a></span>
<span class=normal><a href=#__codelineno-18-6> 6</a></span>
<span class=normal><a href=#__codelineno-18-7> 7</a></span>
<span class=normal><a href=#__codelineno-18-8> 8</a></span>
<span class=normal><a href=#__codelineno-18-9> 9</a></span>
<span class=normal><a href=#__codelineno-18-10>10</a></span>
<span class=normal><a href=#__codelineno-18-11>11</a></span>
<span class=normal><a href=#__codelineno-18-12>12</a></span>
<span class=normal><a href=#__codelineno-18-13>13</a></span>
<span class=normal><a href=#__codelineno-18-14>14</a></span>
<span class=normal><a href=#__codelineno-18-15>15</a></span>
<span class=normal><a href=#__codelineno-18-16>16</a></span>
<span class=normal><a href=#__codelineno-18-17>17</a></span>
<span class=normal><a href=#__codelineno-18-18>18</a></span>
<span class=normal><a href=#__codelineno-18-19>19</a></span>
<span class=normal><a href=#__codelineno-18-20>20</a></span>
<span class=normal><a href=#__codelineno-18-21>21</a></span>
<span class=normal><a href=#__codelineno-18-22>22</a></span>
<span class=normal><a href=#__codelineno-18-23>23</a></span>
<span class=normal><a href=#__codelineno-18-24>24</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-18-1><a id=__codelineno-18-1 name=__codelineno-18-1></a><span class=k>using</span><span class=w> </span><span class=nn>UnityEngine</span><span class=p>;</span>
</span><span id=__span-18-2><a id=__codelineno-18-2 name=__codelineno-18-2></a><span class=k>using</span><span class=w> </span><span class=nn>WallstopStudios.UnityHelpers.Core.Attributes</span><span class=p>;</span>
</span><span id=__span-18-3><a id=__codelineno-18-3 name=__codelineno-18-3></a>
</span><span id=__span-18-4><a id=__codelineno-18-4 name=__codelineno-18-4></a><span class=k>public</span><span class=w> </span><span class=k>class</span><span class=w> </span><span class=nc>SpawnManager</span><span class=w> </span><span class=p>:</span><span class=w> </span><span class=n>MonoBehaviour</span>
</span><span id=__span-18-5><a id=__codelineno-18-5 name=__codelineno-18-5></a><span class=p>{</span>
</span><span id=__span-18-6><a id=__codelineno-18-6 name=__codelineno-18-6></a><span class=w> </span><span class=na>[ValidateAssignment]</span>
</span><span id=__span-18-7><a id=__codelineno-18-7 name=__codelineno-18-7></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>GameObject</span><span class=w> </span><span class=n>spawnPrefab</span><span class=p>;</span>
</span><span id=__span-18-8><a id=__codelineno-18-8 name=__codelineno-18-8></a>
</span><span id=__span-18-9><a id=__codelineno-18-9 name=__codelineno-18-9></a><span class=w> </span><span class=na>[ValidateAssignment]</span>
</span><span id=__span-18-10><a id=__codelineno-18-10 name=__codelineno-18-10></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>List</span><span class=o><</span><span class=n>Transform</span><span class=o>></span><span class=w> </span><span class=n>spawnLocations</span><span class=p>;</span>
</span><span id=__span-18-11><a id=__codelineno-18-11 name=__codelineno-18-11></a>
</span><span id=__span-18-12><a id=__codelineno-18-12 name=__codelineno-18-12></a><span class=w> </span><span class=k>private</span><span class=w> </span><span class=k>void</span><span class=w> </span><span class=nf>Start</span><span class=p>()</span>
</span><span id=__span-18-13><a id=__codelineno-18-13 name=__codelineno-18-13></a><span class=w> </span><span class=p>{</span>
</span><span id=__span-18-14><a id=__codelineno-18-14 name=__codelineno-18-14></a><span class=w> </span><span class=k>if</span><span class=w> </span><span class=p>(</span><span class=k>this</span><span class=p>.</span><span class=n>AreAnyAssignmentsInvalid</span><span class=p>())</span>
</span><span id=__span-18-15><a id=__codelineno-18-15 name=__codelineno-18-15></a><span class=w> </span><span class=p>{</span>
</span><span id=__span-18-16><a id=__codelineno-18-16 name=__codelineno-18-16></a><span class=w> </span><span class=n>Debug</span><span class=p>.</span><span class=n>LogError</span><span class=p>(</span><span class=s>"SpawnManager has invalid assignments - spawning disabled"</span><span class=p>);</span>
</span><span id=__span-18-17><a id=__codelineno-18-17 name=__codelineno-18-17></a><span class=w> </span><span class=n>enabled</span><span class=w> </span><span class=o>=</span><span class=w> </span><span class=k>false</span><span class=p>;</span>
</span><span id=__span-18-18><a id=__codelineno-18-18 name=__codelineno-18-18></a><span class=w> </span><span class=k>return</span><span class=p>;</span>
</span><span id=__span-18-19><a id=__codelineno-18-19 name=__codelineno-18-19></a><span class=w> </span><span class=p>}</span>
</span><span id=__span-18-20><a id=__codelineno-18-20 name=__codelineno-18-20></a>
</span><span id=__span-18-21><a id=__codelineno-18-21 name=__codelineno-18-21></a><span class=w> </span><span class=c1>// Safe to proceed - all assignments are valid</span>
</span><span id=__span-18-22><a id=__codelineno-18-22 name=__codelineno-18-22></a><span class=w> </span><span class=n>SpawnEnemies</span><span class=p>();</span>
</span><span id=__span-18-23><a id=__codelineno-18-23 name=__codelineno-18-23></a><span class=w> </span><span class=p>}</span>
</span><span id=__span-18-24><a id=__codelineno-18-24 name=__codelineno-18-24></a><span class=p>}</span>
</span></code></pre></div></td></tr></table></div> <h3 id=validateassignment-vs-wnotnull>ValidateAssignment vs WNotNull<a class=headerlink href=#validateassignment-vs-wnotnull title="Permanent link">¶</a></h3> <p>Both attributes validate fields and provide inspector feedback, but they serve different purposes:</p> <table> <thead> <tr> <th>Feature</th> <th>ValidateAssignment</th> <th>WNotNull</th> </tr> </thead> <tbody> <tr> <td><strong>Null object check</strong></td> <td>✓</td> <td>✓</td> </tr> <tr> <td><strong>Empty string check</strong></td> <td>✓</td> <td>✗</td> </tr> <tr> <td><strong>Empty collection check</strong></td> <td>✓</td> <td>✗</td> </tr> <tr> <td><strong>Runtime behavior</strong></td> <td>Logs warnings</td> <td>Throws <code>ArgumentNullException</code></td> </tr> <tr> <td><strong>Best for</strong></td> <td>Comprehensive field validation</td> <td>Strict null reference checking</td> </tr> </tbody> </table> <p><strong>When to use which:</strong></p> <ul> <li>Use <code>[ValidateAssignment]</code> when you need to validate that strings are non-empty or collections have elements</li> <li>Use <code>[WNotNull]</code> when you want strict null checking with an exception thrown at runtime</li> <li>Use <code>[ValidateAssignment]</code> when you want softer runtime validation (warnings instead of exceptions)</li> <li>Use <code>[WNotNull]</code> for critical references where the game should fail fast if not assigned</li> </ul> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-19-1> 1</a></span>
<span class=normal><a href=#__codelineno-19-2> 2</a></span>
<span class=normal><a href=#__codelineno-19-3> 3</a></span>
<span class=normal><a href=#__codelineno-19-4> 4</a></span>
<span class=normal><a href=#__codelineno-19-5> 5</a></span>
<span class=normal><a href=#__codelineno-19-6> 6</a></span>
<span class=normal><a href=#__codelineno-19-7> 7</a></span>
<span class=normal><a href=#__codelineno-19-8> 8</a></span>
<span class=normal><a href=#__codelineno-19-9> 9</a></span>
<span class=normal><a href=#__codelineno-19-10>10</a></span>
<span class=normal><a href=#__codelineno-19-11>11</a></span>
<span class=normal><a href=#__codelineno-19-12>12</a></span>
<span class=normal><a href=#__codelineno-19-13>13</a></span>
<span class=normal><a href=#__codelineno-19-14>14</a></span>
<span class=normal><a href=#__codelineno-19-15>15</a></span>
<span class=normal><a href=#__codelineno-19-16>16</a></span>
<span class=normal><a href=#__codelineno-19-17>17</a></span>
<span class=normal><a href=#__codelineno-19-18>18</a></span>
<span class=normal><a href=#__codelineno-19-19>19</a></span>
<span class=normal><a href=#__codelineno-19-20>20</a></span>
<span class=normal><a href=#__codelineno-19-21>21</a></span>
<span class=normal><a href=#__codelineno-19-22>22</a></span>
<span class=normal><a href=#__codelineno-19-23>23</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-19-1><a id=__codelineno-19-1 name=__codelineno-19-1></a><span class=k>public</span><span class=w> </span><span class=k>class</span><span class=w> </span><span class=nc>PlayerSetup</span><span class=w> </span><span class=p>:</span><span class=w> </span><span class=n>MonoBehaviour</span>
</span><span id=__span-19-2><a id=__codelineno-19-2 name=__codelineno-19-2></a><span class=p>{</span>
</span><span id=__span-19-3><a id=__codelineno-19-3 name=__codelineno-19-3></a><span class=w> </span><span class=c1>// Use WNotNull for critical references - throws if null</span>
</span><span id=__span-19-4><a id=__codelineno-19-4 name=__codelineno-19-4></a><span class=w> </span><span class=na>[WNotNull(WNotNullMessageType.Error)]</span>
</span><span id=__span-19-5><a id=__codelineno-19-5 name=__codelineno-19-5></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>Rigidbody2D</span><span class=w> </span><span class=n>rb</span><span class=p>;</span>
</span><span id=__span-19-6><a id=__codelineno-19-6 name=__codelineno-19-6></a>
</span><span id=__span-19-7><a id=__codelineno-19-7 name=__codelineno-19-7></a><span class=w> </span><span class=c1>// Use ValidateAssignment for string validation</span>
</span><span id=__span-19-8><a id=__codelineno-19-8 name=__codelineno-19-8></a><span class=w> </span><span class=na>[ValidateAssignment]</span>
</span><span id=__span-19-9><a id=__codelineno-19-9 name=__codelineno-19-9></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=kt>string</span><span class=w> </span><span class=n>playerName</span><span class=p>;</span>
</span><span id=__span-19-10><a id=__codelineno-19-10 name=__codelineno-19-10></a>
</span><span id=__span-19-11><a id=__codelineno-19-11 name=__codelineno-19-11></a><span class=w> </span><span class=c1>// Use ValidateAssignment for collection validation</span>
</span><span id=__span-19-12><a id=__codelineno-19-12 name=__codelineno-19-12></a><span class=w> </span><span class=na>[ValidateAssignment(ValidateAssignmentMessageType.Error, "Add at least one weapon")]</span>
</span><span id=__span-19-13><a id=__codelineno-19-13 name=__codelineno-19-13></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>List</span><span class=o><</span><span class=n>GameObject</span><span class=o>></span><span class=w> </span><span class=n>startingWeapons</span><span class=p>;</span>
</span><span id=__span-19-14><a id=__codelineno-19-14 name=__codelineno-19-14></a>
</span><span id=__span-19-15><a id=__codelineno-19-15 name=__codelineno-19-15></a><span class=w> </span><span class=k>private</span><span class=w> </span><span class=k>void</span><span class=w> </span><span class=nf>Awake</span><span class=p>()</span>
</span><span id=__span-19-16><a id=__codelineno-19-16 name=__codelineno-19-16></a><span class=w> </span><span class=p>{</span>
</span><span id=__span-19-17><a id=__codelineno-19-17 name=__codelineno-19-17></a><span class=w> </span><span class=c1>// Throws ArgumentNullException if rb is null</span>
</span><span id=__span-19-18><a id=__codelineno-19-18 name=__codelineno-19-18></a><span class=w> </span><span class=k>this</span><span class=p>.</span><span class=n>CheckForNulls</span><span class=p>();</span>
</span><span id=__span-19-19><a id=__codelineno-19-19 name=__codelineno-19-19></a>
</span><span id=__span-19-20><a id=__codelineno-19-20 name=__codelineno-19-20></a><span class=w> </span><span class=c1>// Logs warnings if playerName is empty or startingWeapons is empty</span>
</span><span id=__span-19-21><a id=__codelineno-19-21 name=__codelineno-19-21></a><span class=w> </span><span class=k>this</span><span class=p>.</span><span class=n>ValidateAssignments</span><span class=p>();</span>
</span><span id=__span-19-22><a id=__codelineno-19-22 name=__codelineno-19-22></a><span class=w> </span><span class=p>}</span>
</span><span id=__span-19-23><a id=__codelineno-19-23 name=__codelineno-19-23></a><span class=p>}</span>
</span></code></pre></div></td></tr></table></div> <h3 id=combining-with-other-attributes_1>Combining with Other Attributes<a class=headerlink href=#combining-with-other-attributes_1 title="Permanent link">¶</a></h3> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-20-1> 1</a></span>
<span class=normal><a href=#__codelineno-20-2> 2</a></span>
<span class=normal><a href=#__codelineno-20-3> 3</a></span>
<span class=normal><a href=#__codelineno-20-4> 4</a></span>
<span class=normal><a href=#__codelineno-20-5> 5</a></span>
<span class=normal><a href=#__codelineno-20-6> 6</a></span>
<span class=normal><a href=#__codelineno-20-7> 7</a></span>
<span class=normal><a href=#__codelineno-20-8> 8</a></span>
<span class=normal><a href=#__codelineno-20-9> 9</a></span>
<span class=normal><a href=#__codelineno-20-10>10</a></span>
<span class=normal><a href=#__codelineno-20-11>11</a></span>
<span class=normal><a href=#__codelineno-20-12>12</a></span>
<span class=normal><a href=#__codelineno-20-13>13</a></span>
<span class=normal><a href=#__codelineno-20-14>14</a></span>
<span class=normal><a href=#__codelineno-20-15>15</a></span>
<span class=normal><a href=#__codelineno-20-16>16</a></span>
<span class=normal><a href=#__codelineno-20-17>17</a></span>
<span class=normal><a href=#__codelineno-20-18>18</a></span>
<span class=normal><a href=#__codelineno-20-19>19</a></span>
<span class=normal><a href=#__codelineno-20-20>20</a></span>
<span class=normal><a href=#__codelineno-20-21>21</a></span>
<span class=normal><a href=#__codelineno-20-22>22</a></span>
<span class=normal><a href=#__codelineno-20-23>23</a></span>
<span class=normal><a href=#__codelineno-20-24>24</a></span>
<span class=normal><a href=#__codelineno-20-25>25</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-20-1><a id=__codelineno-20-1 name=__codelineno-20-1></a><span class=k>using</span><span class=w> </span><span class=nn>UnityEngine</span><span class=p>;</span>
</span><span id=__span-20-2><a id=__codelineno-20-2 name=__codelineno-20-2></a><span class=k>using</span><span class=w> </span><span class=nn>WallstopStudios.UnityHelpers.Core.Attributes</span><span class=p>;</span>
</span><span id=__span-20-3><a id=__codelineno-20-3 name=__codelineno-20-3></a><span class=k>using</span><span class=w> </span><span class=nn>System.Collections.Generic</span><span class=p>;</span>
</span><span id=__span-20-4><a id=__codelineno-20-4 name=__codelineno-20-4></a>
</span><span id=__span-20-5><a id=__codelineno-20-5 name=__codelineno-20-5></a><span class=k>public</span><span class=w> </span><span class=k>class</span><span class=w> </span><span class=nc>UIManager</span><span class=w> </span><span class=p>:</span><span class=w> </span><span class=n>MonoBehaviour</span>
</span><span id=__span-20-6><a id=__codelineno-20-6 name=__codelineno-20-6></a><span class=p>{</span>
</span><span id=__span-20-7><a id=__codelineno-20-7 name=__codelineno-20-7></a><span class=w> </span><span class=c1>// Group with validation</span>
</span><span id=__span-20-8><a id=__codelineno-20-8 name=__codelineno-20-8></a><span class=w> </span><span class=na>[WGroup("Required UI Elements")]</span>
</span><span id=__span-20-9><a id=__codelineno-20-9 name=__codelineno-20-9></a><span class=w> </span><span class=na>[ValidateAssignment(ValidateAssignmentMessageType.Error)]</span>
</span><span id=__span-20-10><a id=__codelineno-20-10 name=__codelineno-20-10></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>Canvas</span><span class=w> </span><span class=n>mainCanvas</span><span class=p>;</span><span class=w> </span><span class=c1>// In group</span>
</span><span id=__span-20-11><a id=__codelineno-20-11 name=__codelineno-20-11></a>
</span><span id=__span-20-12><a id=__codelineno-20-12 name=__codelineno-20-12></a><span class=w> </span><span class=na>[ValidateAssignment("Button text cannot be empty")]</span>
</span><span id=__span-20-13><a id=__codelineno-20-13 name=__codelineno-20-13></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=kt>string</span><span class=w> </span><span class=n>startButtonText</span><span class=p>;</span><span class=w> </span><span class=c1>// In group (auto-included)</span>
</span><span id=__span-20-14><a id=__codelineno-20-14 name=__codelineno-20-14></a>
</span><span id=__span-20-15><a id=__codelineno-20-15 name=__codelineno-20-15></a><span class=w> </span><span class=na>[ValidateAssignment(ValidateAssignmentMessageType.Error, "Add menu items to display")]</span>
</span><span id=__span-20-16><a id=__codelineno-20-16 name=__codelineno-20-16></a><span class=w> </span><span class=na>[WGroupEnd("Required UI Elements")]</span><span class=w> </span><span class=c1>// menuItems IS included, then closes</span>
</span><span id=__span-20-17><a id=__codelineno-20-17 name=__codelineno-20-17></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>List</span><span class=o><</span><span class=n>GameObject</span><span class=o>></span><span class=w> </span><span class=n>menuItems</span><span class=p>;</span><span class=w> </span><span class=c1>// In group (last field)</span>
</span><span id=__span-20-18><a id=__codelineno-20-18 name=__codelineno-20-18></a>
</span><span id=__span-20-19><a id=__codelineno-20-19 name=__codelineno-20-19></a><span class=w> </span><span class=c1>// Conditional validation</span>
</span><span id=__span-20-20><a id=__codelineno-20-20 name=__codelineno-20-20></a><span class=w> </span><span class=na>[WShowIf(nameof(useCustomTheme))]</span>
</span><span id=__span-20-21><a id=__codelineno-20-21 name=__codelineno-20-21></a><span class=w> </span><span class=na>[ValidateAssignment("Custom theme name required when using custom theme")]</span>
</span><span id=__span-20-22><a id=__codelineno-20-22 name=__codelineno-20-22></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=kt>string</span><span class=w> </span><span class=n>customThemeName</span><span class=p>;</span>
</span><span id=__span-20-23><a id=__codelineno-20-23 name=__codelineno-20-23></a>
</span><span id=__span-20-24><a id=__codelineno-20-24 name=__codelineno-20-24></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=kt>bool</span><span class=w> </span><span class=n>useCustomTheme</span><span class=p>;</span>
</span><span id=__span-20-25><a id=__codelineno-20-25 name=__codelineno-20-25></a><span class=p>}</span>
</span></code></pre></div></td></tr></table></div> <p><strong>Why Use ValidateAssignment:</strong></p> <ul> <li><strong>Comprehensive validation</strong>: Validates strings, collections, and references—not just null checks</li> <li><strong>Visual feedback</strong>: See invalid fields immediately in the inspector</li> <li><strong>Severity control</strong>: Use warnings for nice-to-have fields, errors for critical ones</li> <li><strong>Custom messages</strong>: Provide helpful context about validation requirements</li> <li><strong>Non-throwing validation</strong>: Use <code>ValidateAssignments()</code> for warnings instead of exceptions</li> <li><strong>Programmatic checking</strong>: Use <code>AreAnyAssignmentsInvalid()</code> for conditional logic</li> <li><strong>Zero runtime cost</strong>: All validation stripped from builds</li> </ul> <hr> <h2 id=best-practices>Best Practices<a class=headerlink href=#best-practices title="Permanent link">¶</a></h2> <h3 id=1-validate-early>1. Validate Early<a class=headerlink href=#1-validate-early title="Permanent link">¶</a></h3> <p>Call <code>CheckForNulls()</code> and <code>ValidateAssignments()</code> in <code>Awake()</code> or <code>Start()</code> to catch missing references immediately:</p> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-21-1>1</a></span>
<span class=normal><a href=#__codelineno-21-2>2</a></span>
<span class=normal><a href=#__codelineno-21-3>3</a></span>
<span class=normal><a href=#__codelineno-21-4>4</a></span>
<span class=normal><a href=#__codelineno-21-5>5</a></span>
<span class=normal><a href=#__codelineno-21-6>6</a></span>
<span class=normal><a href=#__codelineno-21-7>7</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-21-1><a id=__codelineno-21-1 name=__codelineno-21-1></a><span class=k>private</span><span class=w> </span><span class=k>void</span><span class=w> </span><span class=nf>Awake</span><span class=p>()</span>
</span><span id=__span-21-2><a id=__codelineno-21-2 name=__codelineno-21-2></a><span class=p>{</span>
</span><span id=__span-21-3><a id=__codelineno-21-3 name=__codelineno-21-3></a><span class=w> </span><span class=c1>// Throws for critical null references</span>
</span><span id=__span-21-4><a id=__codelineno-21-4 name=__codelineno-21-4></a><span class=w> </span><span class=k>this</span><span class=p>.</span><span class=n>CheckForNulls</span><span class=p>();</span>
</span><span id=__span-21-5><a id=__codelineno-21-5 name=__codelineno-21-5></a><span class=w> </span><span class=c1>// Logs warnings for empty strings, collections, etc.</span>
</span><span id=__span-21-6><a id=__codelineno-21-6 name=__codelineno-21-6></a><span class=w> </span><span class=k>this</span><span class=p>.</span><span class=n>ValidateAssignments</span><span class=p>();</span>
</span><span id=__span-21-7><a id=__codelineno-21-7 name=__codelineno-21-7></a><span class=p>}</span>
</span></code></pre></div></td></tr></table></div> <h3 id=2-choose-the-right-validation-attribute>2. Choose the Right Validation Attribute<a class=headerlink href=#2-choose-the-right-validation-attribute title="Permanent link">¶</a></h3> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-22-1> 1</a></span>
<span class=normal><a href=#__codelineno-22-2> 2</a></span>
<span class=normal><a href=#__codelineno-22-3> 3</a></span>
<span class=normal><a href=#__codelineno-22-4> 4</a></span>
<span class=normal><a href=#__codelineno-22-5> 5</a></span>
<span class=normal><a href=#__codelineno-22-6> 6</a></span>
<span class=normal><a href=#__codelineno-22-7> 7</a></span>
<span class=normal><a href=#__codelineno-22-8> 8</a></span>
<span class=normal><a href=#__codelineno-22-9> 9</a></span>
<span class=normal><a href=#__codelineno-22-10>10</a></span>
<span class=normal><a href=#__codelineno-22-11>11</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-22-1><a id=__codelineno-22-1 name=__codelineno-22-1></a><span class=c1>// Use WNotNull for critical object references (throws on null)</span>
</span><span id=__span-22-2><a id=__codelineno-22-2 name=__codelineno-22-2></a><span class=na>[WNotNull(WNotNullMessageType.Error)]</span>
</span><span id=__span-22-3><a id=__codelineno-22-3 name=__codelineno-22-3></a><span class=k>public</span><span class=w> </span><span class=n>Rigidbody2D</span><span class=w> </span><span class=n>rb</span><span class=p>;</span>
</span><span id=__span-22-4><a id=__codelineno-22-4 name=__codelineno-22-4></a>
</span><span id=__span-22-5><a id=__codelineno-22-5 name=__codelineno-22-5></a><span class=c1>// Use ValidateAssignment for strings (validates not empty/whitespace)</span>
</span><span id=__span-22-6><a id=__codelineno-22-6 name=__codelineno-22-6></a><span class=na>[ValidateAssignment]</span>
</span><span id=__span-22-7><a id=__codelineno-22-7 name=__codelineno-22-7></a><span class=k>public</span><span class=w> </span><span class=kt>string</span><span class=w> </span><span class=n>playerName</span><span class=p>;</span>
</span><span id=__span-22-8><a id=__codelineno-22-8 name=__codelineno-22-8></a>
</span><span id=__span-22-9><a id=__codelineno-22-9 name=__codelineno-22-9></a><span class=c1>// Use ValidateAssignment for collections (validates not empty)</span>
</span><span id=__span-22-10><a id=__codelineno-22-10 name=__codelineno-22-10></a><span class=na>[ValidateAssignment(ValidateAssignmentMessageType.Error)]</span>
</span><span id=__span-22-11><a id=__codelineno-22-11 name=__codelineno-22-11></a><span class=k>public</span><span class=w> </span><span class=n>List</span><span class=o><</span><span class=n>Transform</span><span class=o>></span><span class=w> </span><span class=n>waypoints</span><span class=p>;</span>
</span></code></pre></div></td></tr></table></div> <h3 id=3-use-wreadonly-for-computed-values>3. Use WReadOnly for Computed Values<a class=headerlink href=#3-use-wreadonly-for-computed-values title="Permanent link">¶</a></h3> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-23-1>1</a></span>
<span class=normal><a href=#__codelineno-23-2>2</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-23-1><a id=__codelineno-23-1 name=__codelineno-23-1></a><span class=na>[WReadOnly]</span>
</span><span id=__span-23-2><a id=__codelineno-23-2 name=__codelineno-23-2></a><span class=k>public</span><span class=w> </span><span class=kt>float</span><span class=w> </span><span class=n>Speed</span><span class=w> </span><span class=o>=></span><span class=w> </span><span class=n>rb</span><span class=p>.</span><span class=n>velocity</span><span class=p>.</span><span class=n>magnitude</span><span class=p>;</span>
</span></code></pre></div></td></tr></table></div> <h3 id=4-combine-with-relational-components>4. Combine with Relational Components<a class=headerlink href=#4-combine-with-relational-components title="Permanent link">¶</a></h3> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-24-1>1</a></span>
<span class=normal><a href=#__codelineno-24-2>2</a></span>
<span class=normal><a href=#__codelineno-24-3>3</a></span>
<span class=normal><a href=#__codelineno-24-4>4</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-24-1><a id=__codelineno-24-1 name=__codelineno-24-1></a><span class=c1>// Auto-wired but protected from manual changes</span>
</span><span id=__span-24-2><a id=__codelineno-24-2 name=__codelineno-24-2></a><span class=na>[WReadOnly]</span>
</span><span id=__span-24-3><a id=__codelineno-24-3 name=__codelineno-24-3></a><span class=na>[SiblingComponent]</span>
</span><span id=__span-24-4><a id=__codelineno-24-4 name=__codelineno-24-4></a><span class=k>public</span><span class=w> </span><span class=n>Collider2D</span><span class=w> </span><span class=n>col</span><span class=p>;</span>
</span></code></pre></div></td></tr></table></div> <h3 id=5-document-intent>5. Document Intent<a class=headerlink href=#5-document-intent title="Permanent link">¶</a></h3> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-25-1> 1</a></span>
<span class=normal><a href=#__codelineno-25-2> 2</a></span>
<span class=normal><a href=#__codelineno-25-3> 3</a></span>
<span class=normal><a href=#__codelineno-25-4> 4</a></span>
<span class=normal><a href=#__codelineno-25-5> 5</a></span>
<span class=normal><a href=#__codelineno-25-6> 6</a></span>
<span class=normal><a href=#__codelineno-25-7> 7</a></span>
<span class=normal><a href=#__codelineno-25-8> 8</a></span>
<span class=normal><a href=#__codelineno-25-9> 9</a></span>
<span class=normal><a href=#__codelineno-25-10>10</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-25-1><a id=__codelineno-25-1 name=__codelineno-25-1></a><span class=c1>// Required: Must be assigned in inspector</span>
</span><span id=__span-25-2><a id=__codelineno-25-2 name=__codelineno-25-2></a><span class=na>[WNotNull]</span>
</span><span id=__span-25-3><a id=__codelineno-25-3 name=__codelineno-25-3></a><span class=k>public</span><span class=w> </span><span class=n>AudioClip</span><span class=w> </span><span class=n>attackSound</span><span class=p>;</span>
</span><span id=__span-25-4><a id=__codelineno-25-4 name=__codelineno-25-4></a>
</span><span id=__span-25-5><a id=__codelineno-25-5 name=__codelineno-25-5></a><span class=c1>// Required: Must not be empty</span>
</span><span id=__span-25-6><a id=__codelineno-25-6 name=__codelineno-25-6></a><span class=na>[ValidateAssignment]</span>
</span><span id=__span-25-7><a id=__codelineno-25-7 name=__codelineno-25-7></a><span class=k>public</span><span class=w> </span><span class=kt>string</span><span class=w> </span><span class=n>characterName</span><span class=p>;</span>
</span><span id=__span-25-8><a id=__codelineno-25-8 name=__codelineno-25-8></a>
</span><span id=__span-25-9><a id=__codelineno-25-9 name=__codelineno-25-9></a><span class=c1>// Optional: May be null</span>
</span><span id=__span-25-10><a id=__codelineno-25-10 name=__codelineno-25-10></a><span class=k>public</span><span class=w> </span><span class=n>AudioClip</span><span class=w> </span><span class=n>hitSound</span><span class=p>;</span>
</span></code></pre></div></td></tr></table></div> <h3 id=6-use-with-scriptableobjects>6. Use with ScriptableObjects<a class=headerlink href=#6-use-with-scriptableobjects title="Permanent link">¶</a></h3> <div class="language-csharp highlight"><table class=highlighttable><tr><th colspan=2 class=filename><span class=filename>C#</span></th></tr><tr><td class=linenos><div class=linenodiv><pre><span></span><span class=normal><a href=#__codelineno-26-1> 1</a></span>
<span class=normal><a href=#__codelineno-26-2> 2</a></span>
<span class=normal><a href=#__codelineno-26-3> 3</a></span>
<span class=normal><a href=#__codelineno-26-4> 4</a></span>
<span class=normal><a href=#__codelineno-26-5> 5</a></span>
<span class=normal><a href=#__codelineno-26-6> 6</a></span>
<span class=normal><a href=#__codelineno-26-7> 7</a></span>
<span class=normal><a href=#__codelineno-26-8> 8</a></span>
<span class=normal><a href=#__codelineno-26-9> 9</a></span>
<span class=normal><a href=#__codelineno-26-10>10</a></span>
<span class=normal><a href=#__codelineno-26-11>11</a></span>
<span class=normal><a href=#__codelineno-26-12>12</a></span>
<span class=normal><a href=#__codelineno-26-13>13</a></span>
<span class=normal><a href=#__codelineno-26-14>14</a></span>
<span class=normal><a href=#__codelineno-26-15>15</a></span>
<span class=normal><a href=#__codelineno-26-16>16</a></span>
<span class=normal><a href=#__codelineno-26-17>17</a></span>
<span class=normal><a href=#__codelineno-26-18>18</a></span>
<span class=normal><a href=#__codelineno-26-19>19</a></span>
<span class=normal><a href=#__codelineno-26-20>20</a></span>
<span class=normal><a href=#__codelineno-26-21>21</a></span></pre></div></td><td class=code><div><pre><span></span><code><span id=__span-26-1><a id=__codelineno-26-1 name=__codelineno-26-1></a><span class=na>[CreateAssetMenu]</span>
</span><span id=__span-26-2><a id=__codelineno-26-2 name=__codelineno-26-2></a><span class=k>public</span><span class=w> </span><span class=k>class</span><span class=w> </span><span class=nc>GameConfig</span><span class=w> </span><span class=p>:</span><span class=w> </span><span class=n>ScriptableObject</span>
</span><span id=__span-26-3><a id=__codelineno-26-3 name=__codelineno-26-3></a><span class=p>{</span>
</span><span id=__span-26-4><a id=__codelineno-26-4 name=__codelineno-26-4></a><span class=w> </span><span class=na>[WNotNull]</span>
</span><span id=__span-26-5><a id=__codelineno-26-5 name=__codelineno-26-5></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>GameObject</span><span class=w> </span><span class=n>playerPrefab</span><span class=p>;</span>
</span><span id=__span-26-6><a id=__codelineno-26-6 name=__codelineno-26-6></a>
</span><span id=__span-26-7><a id=__codelineno-26-7 name=__codelineno-26-7></a><span class=w> </span><span class=na>[WNotNull]</span>
</span><span id=__span-26-8><a id=__codelineno-26-8 name=__codelineno-26-8></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>Material</span><span class=w> </span><span class=n>defaultMaterial</span><span class=p>;</span>
</span><span id=__span-26-9><a id=__codelineno-26-9 name=__codelineno-26-9></a>
</span><span id=__span-26-10><a id=__codelineno-26-10 name=__codelineno-26-10></a><span class=w> </span><span class=na>[ValidateAssignment("Game title cannot be empty")]</span>
</span><span id=__span-26-11><a id=__codelineno-26-11 name=__codelineno-26-11></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=kt>string</span><span class=w> </span><span class=n>gameTitle</span><span class=p>;</span>
</span><span id=__span-26-12><a id=__codelineno-26-12 name=__codelineno-26-12></a>
</span><span id=__span-26-13><a id=__codelineno-26-13 name=__codelineno-26-13></a><span class=w> </span><span class=na>[ValidateAssignment(ValidateAssignmentMessageType.Error)]</span>
</span><span id=__span-26-14><a id=__codelineno-26-14 name=__codelineno-26-14></a><span class=w> </span><span class=k>public</span><span class=w> </span><span class=n>List</span><span class=o><</span><span class=kt>string</span><span class=o>></span><span class=w> </span><span class=n>supportedLanguages</span><span class=p>;</span>
</span><span id=__span-26-15><a id=__codelineno-26-15 name=__codelineno-26-15></a>
</span><span id=__span-26-16><a id=__codelineno-26-16 name=__codelineno-26-16></a><span class=w> </span><span class=k>private</span><span class=w> </span><span class=k>void</span><span class=w> </span><span class=nf>OnEnable</span><span class=p>()</span>
</span><span id=__span-26-17><a id=__codelineno-26-17 name=__codelineno-26-17></a><span class=w> </span><span class=p>{</span>
</span><span id=__span-26-18><a id=__codelineno-26-18 name=__codelineno-26-18></a><span class=w> </span><span class=k>this</span><span class=p>.</span><span class=n>CheckForNulls</span><span class=p>();</span>
</span><span id=__span-26-19><a id=__codelineno-26-19 name=__codelineno-26-19></a><span class=w> </span><span class=k>this</span><span class=p>.</span><span class=n>ValidateAssignments</span><span class=p>();</span>
</span><span id=__span-26-20><a id=__codelineno-26-20 name=__codelineno-26-20></a><span class=w> </span><span class=p>}</span>
</span><span id=__span-26-21><a id=__codelineno-26-21 name=__codelineno-26-21></a><span class=p>}</span>
</span></code></pre></div></td></tr></table></div> <hr> <h2 id=see-also>See Also<a class=headerlink href=#see-also title="Permanent link">¶</a></h2> <ul> <li><strong><a href=../inspector-grouping-attributes/ >Inspector Grouping Attributes</a></strong> - Organize related fields</li> <li><strong><a href=../inspector-conditional-display/ >Inspector Conditional Display</a></strong> - Show/hide fields conditionally</li> <li><strong><a href=../../relational-components/relational-components/ >Relational Components</a></strong> - Auto-wire component references</li> </ul> <aside class=md-source-file> <span class=md-source-file__fact> <span class=md-icon title="Last update"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M21 13.1c-.1 0-.3.1-.4.2l-1 1 2.1 2.1 1-1c.2-.2.2-.6 0-.8l-1.3-1.3c-.1-.1-.2-.2-.4-.2m-1.9 1.8-6.1 6V23h2.1l6.1-6.1zM12.5 7v5.2l4 2.4-1 1L11 13V7zM11 21.9c-5.1-.5-9-4.8-9-9.9C2 6.5 6.5 2 12 2c5.3 0 9.6 4.1 10 9.3-.3-.1-.6-.2-1-.2s-.7.1-1 .2C19.6 7.2 16.2 4 12 4c-4.4 0-8 3.6-8 8 0 4.1 3.1 7.5 7.1 7.9l-.1.2z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-timeago" title="January 26, 2026 05:34:01 UTC"><span class=timeago datetime=2026-01-26T05:34:01+00:00 locale=en></span></span><span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-iso_date" title="January 26, 2026 05:34:01 UTC">2026-01-26</span> </span> <span class=md-source-file__fact> <span class=md-icon title=Created> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M14.47 15.08 11 13V7h1.5v5.25l3.08 1.83c-.41.28-.79.62-1.11 1m-1.39 4.84c-.36.05-.71.08-1.08.08-4.42 0-8-3.58-8-8s3.58-8 8-8 8 3.58 8 8c0 .37-.03.72-.08 1.08.69.1 1.33.32 1.92.64.1-.56.16-1.13.16-1.72 0-5.5-4.5-10-10-10S2 6.5 2 12s4.47 10 10 10c.59 0 1.16-.06 1.72-.16-.32-.59-.54-1.23-.64-1.92M18 15v3h-3v2h3v3h2v-3h3v-2h-3v-3z"/></svg> </span> <span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-timeago" title="December 25, 2025 20:02:30 UTC"><span class=timeago datetime=2025-12-25T20:02:30+00:00 locale=en></span></span><span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-iso_date" title="December 25, 2025 20:02:30 UTC">2025-12-25</span> </span> </aside> </article> </div> <script>var tabs=__md_get("__tabs");if(Array.isArray(tabs))e:for(var set of document.querySelectorAll(".tabbed-set")){var labels=set.querySelector(".tabbed-labels");for(var tab of tabs)for(var label of labels.getElementsByTagName("label"))if(label.innerText.trim()===tab){var input=document.getElementById(label.htmlFor);input.checked=!0;continue e}}</script> <script>var target=document.getElementById(location.hash.slice(1));target&&target.name&&(target.checked=target.name.startsWith("__tabbed_"))</script> </div> <button type=button class="md-top md-icon" data-md-component=top hidden> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M13 20h-2V8l-5.5 5.5-1.42-1.42L12 4.16l7.92 7.92-1.42 1.42L13 8z"/></svg> Back to top </button> </main> <footer class=md-footer> <nav class="md-footer__inner md-grid" aria-label=Footer> <a href=../inspector-conditional-display/ class="md-footer__link md-footer__link--prev" aria-label="Previous: Conditional Display"> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M20 11v2H8l5.5 5.5-1.42 1.42L4.16 12l7.92-7.92L13.5 5.5 8 11z"/></svg> </div> <div class=md-footer__title> <span class=md-footer__direction> Previous </span> <div class=md-ellipsis> Conditional Display </div> </div> </a> <a href=../inspector-inline-editor/ class="md-footer__link md-footer__link--next" aria-label="Next: Inline Editor"> <div class=md-footer__title> <span class=md-footer__direction> Next </span> <div class=md-ellipsis> Inline Editor </div> </div> <div class="md-footer__button md-icon"> <svg xmlns=http://www.w3.org/2000/svg viewbox="0 0 24 24"><path d="M4 11v2h12l-5.5 5.5 1.42 1.42L19.84 12l-7.92-7.92L10.5 5.5 16 11z"/></svg> </div> </a> </nav> <div class="md-footer-meta md-typeset"> <div class="md-footer-meta__inner md-grid"> <div class=md-copyright> <div class=md-copyright__highlight> Copyright © 2024-2026 Wallstop Studios - 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