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Add metadata update handler to System.ComponentModel.TypeConverter (#…
…51466) * Add metadata update handler to System.ComponentModel.TypeConverter * Update src/libraries/System.ComponentModel.TypeConverter/src/System/ComponentModel/ReflectTypeDescriptionProvider.cs
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39 changes: 39 additions & 0 deletions
39
...m.ComponentModel.TypeConverter/src/System/ComponentModel/ReflectionCachesUpdateHandler.cs
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// Licensed to the .NET Foundation under one or more agreements. | ||
// The .NET Foundation licenses this file to you under the MIT license. | ||
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#nullable enable | ||
using System.ComponentModel; | ||
using System.Reflection; | ||
using System.Reflection.Metadata; | ||
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[assembly: MetadataUpdateHandler(typeof(ReflectionCachesUpdateHandler))] | ||
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namespace System.ComponentModel | ||
{ | ||
internal static class ReflectionCachesUpdateHandler | ||
{ | ||
public static void BeforeUpdate(Type[]? types) | ||
{ | ||
// ReflectTypeDescriptionProvider maintains global caches on top of reflection. | ||
// Clear those. | ||
ReflectTypeDescriptionProvider.ClearReflectionCaches(); | ||
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// Each type descriptor may also cache reflection-based state that it gathered | ||
// from ReflectTypeDescriptionProvider. Clear those as well. | ||
if (types is not null) | ||
{ | ||
foreach (Type type in types) | ||
{ | ||
TypeDescriptor.Refresh(type); | ||
} | ||
} | ||
else | ||
{ | ||
foreach (Assembly assembly in AppDomain.CurrentDomain.GetAssemblies()) | ||
{ | ||
TypeDescriptor.Refresh(assembly); | ||
} | ||
} | ||
} | ||
} | ||
} |
32 changes: 32 additions & 0 deletions
32
...libraries/System.ComponentModel.TypeConverter/tests/ReflectionCachesUpdateHandlerTests.cs
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// Licensed to the .NET Foundation under one or more agreements. | ||
// The .NET Foundation licenses this file to you under the MIT license. | ||
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using System.Reflection; | ||
using Xunit; | ||
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namespace System.ComponentModel.Tests | ||
{ | ||
[SimpleUpdateTest] | ||
public class ReflectionCachesUpdateHandlerTests | ||
{ | ||
[Fact] | ||
public void ReflectionCachesUpdateHandler_CachesCleared() | ||
{ | ||
AttributeCollection ac1 = TypeDescriptor.GetAttributes(typeof(ReflectionCachesUpdateHandlerTests)); | ||
AttributeCollection ac2 = TypeDescriptor.GetAttributes(typeof(ReflectionCachesUpdateHandlerTests)); | ||
Assert.Equal(ac1.Count, ac2.Count); | ||
Assert.Equal(1, ac1.Count); | ||
Assert.Same(ac1[0], ac2[0]); | ||
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MethodInfo beforeUpdate = typeof(TypeDescriptionProvider).Assembly.GetType("System.ComponentModel.ReflectionCachesUpdateHandler", throwOnError: true).GetMethod("BeforeUpdate"); | ||
Assert.NotNull(beforeUpdate); | ||
beforeUpdate.Invoke(null, new object[] { null }); | ||
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AttributeCollection ac3 = TypeDescriptor.GetAttributes(typeof(ReflectionCachesUpdateHandlerTests)); | ||
Assert.NotSame(ac1[0], ac3[0]); | ||
} | ||
} | ||
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[AttributeUsage(AttributeTargets.All)] | ||
internal sealed class SimpleUpdateTestAttribute : Attribute { } | ||
} |
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