[release/10.0] [Blazor] Clear RootTypeCache cache on HotReload (#63653)

* Clear RootTypeCache cache on HotReload

* ClearCache method

* Fix

---------

Co-authored-by: Marek Fišera <[email protected]>

Author: github-actions[bot]

src/Components/Server/src/Microsoft.AspNetCore.Components.Server.csproj

@@ -39,6 +39,7 @@
   </PropertyGroup>
 
   <ItemGroup>
+    <Compile Include="$(ComponentsSharedSourceRoot)src\HotReloadManager.cs" LinkBase="HotReload" />
     <Compile Include="$(ComponentsSharedSourceRoot)src\CacheHeaderSettings.cs" Link="Shared\CacheHeaderSettings.cs" />
     <Compile Include="$(ComponentsSharedSourceRoot)src\ArrayBuilder.cs" LinkBase="Circuits" />
     <Compile Include="$(ComponentsSharedSourceRoot)src\RenderBatchWriter.cs" LinkBase="Circuits" />

src/Components/Shared/src/RootTypeCache.cs

@@ -1,6 +1,7 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+using Microsoft.AspNetCore.Components.HotReload;
 using System.Collections.Concurrent;
 using System.Diagnostics.CodeAnalysis;
 using System.Reflection;
@@ -12,10 +13,28 @@ namespace Microsoft.AspNetCore.Components;
 #endif
 
 // A cache for root component types
-internal sealed class RootTypeCache
+internal sealed class RootTypeCache : IDisposable
 {
     private readonly ConcurrentDictionary<Key, Type?> _typeToKeyLookUp = new();
 
+    public RootTypeCache()
+    {
+        if (HotReloadManager.Default.MetadataUpdateSupported)
+        {
+            HotReloadManager.Default.OnDeltaApplied += ClearCache;
+        }
+    }
+
+    internal void ClearCache() => _typeToKeyLookUp.Clear();
+
+    public void Dispose()
+    {
+        if (HotReloadManager.Default.MetadataUpdateSupported)
+        {
+            HotReloadManager.Default.OnDeltaApplied -= ClearCache;
+        }
+    }
+
     public Type? GetRootType(string assembly, string type)
     {
         var key = new Key(assembly, type);

src/Components/WebAssembly/WebAssembly/src/Microsoft.AspNetCore.Components.WebAssembly.csproj

@@ -24,6 +24,7 @@
   </ItemGroup>
 
   <ItemGroup>
+    <Compile Include="$(ComponentsSharedSourceRoot)src\HotReloadManager.cs" LinkBase="HotReload" />
     <Compile Include="$(ComponentsSharedSourceRoot)src\BrowserNavigationManagerInterop.cs" />
     <Compile Include="$(ComponentsSharedSourceRoot)src\PullFromJSDataStream.cs" />
     <Compile Include="$(ComponentsSharedSourceRoot)src\TransmitDataStreamToJS.cs" />