[Blazor] OwningComponentBase Dispose method in .NET 10 gets back the original behavior (#64695)

* Unit test that reproduces the problem.

* Feedback: Add more non-trivial cases tests.

* Remove unit testing the buggy behavior.

* Feedback: Trust framework to not to call dispose more than once.

---------

Co-authored-by: Copilot <[email protected]>

Author: ilonatommy

src/Components/Components/src/OwningComponentBase.cs

@@ -44,7 +44,7 @@ protected IServiceProvider ScopedServices
         }
     }
 
-    /// <inhertidoc />
+    /// <inheritdoc />
     void IDisposable.Dispose()
     {
         Dispose(disposing: true);
@@ -69,12 +69,12 @@ protected virtual void Dispose(bool disposing)
         }
     }
 
-    /// <inhertidoc />
+    /// <inheritdoc />
     async ValueTask IAsyncDisposable.DisposeAsync()
     {
         await DisposeAsyncCore().ConfigureAwait(false);
 
-        Dispose(disposing: false);
+        Dispose(disposing: true);
         GC.SuppressFinalize(this);
     }
 
@@ -89,8 +89,6 @@ protected virtual async ValueTask DisposeAsyncCore()
             await _scope.Value.DisposeAsync().ConfigureAwait(false);
             _scope = null;
         }
-
-        IsDisposed = true;
     }
 }
 

src/Components/Components/test/OwningComponentBaseTest.cs

@@ -111,11 +111,129 @@ public MyService(Counter counter)
         void IDisposable.Dispose() => Counter.DisposedCount++;
     }
 
+    [Fact]
+    public async Task DisposeAsync_CallsDispose_WithDisposingTrue()
+    {
+        var services = new ServiceCollection();
+        services.AddSingleton<Counter>();
+        services.AddTransient<MyService>();
+        var serviceProvider = services.BuildServiceProvider();
+
+        var renderer = new TestRenderer(serviceProvider);
+        var component = (ComponentWithDispose)renderer.InstantiateComponent<ComponentWithDispose>();
+
+        _ = component.MyService;
+        await ((IAsyncDisposable)component).DisposeAsync();
+        Assert.True(component.DisposingParameter);
+    }
+
+    [Fact]
+    public async Task DisposeAsync_ThenDispose_IsIdempotent()
+    {
+        var services = new ServiceCollection();
+        services.AddSingleton<Counter>();
+        services.AddTransient<MyService>();
+        var serviceProvider = services.BuildServiceProvider();
+
+        var counter = serviceProvider.GetRequiredService<Counter>();
+        var renderer = new TestRenderer(serviceProvider);
+        var component = (ComponentWithDispose)renderer.InstantiateComponent<ComponentWithDispose>();
+
+        _ = component.MyService;
+        
+        await ((IAsyncDisposable)component).DisposeAsync();
+        var firstCallCount = component.DisposeCallCount;
+        Assert.Equal(1, counter.DisposedCount);
+        
+        ((IDisposable)component).Dispose();
+        Assert.True(component.DisposeCallCount >= firstCallCount);
+        Assert.Equal(1, counter.DisposedCount);
+    }
+
+    private class ComponentWithDispose : OwningComponentBase<MyService>
+    {
+        public MyService MyService => Service;
+        public bool? DisposingParameter { get; private set; }
+        public int DisposeCallCount { get; private set; }
+
+        protected override void Dispose(bool disposing)
+        {
+            DisposingParameter = disposing;
+            DisposeCallCount++;
+            base.Dispose(disposing);
+        }
+    }
+
     private class MyOwningComponent : OwningComponentBase<MyService>
     {
         public MyService MyService => Service;
 
         // Expose IsDisposed for testing
         public bool IsDisposedPublic => IsDisposed;
     }
+
+    [Fact]
+    public async Task ComplexComponent_DisposesResourcesOnlyWhenDisposingIsTrue()
+    {
+        var services = new ServiceCollection();
+        services.AddSingleton<Counter>();
+        services.AddTransient<MyService>();
+        var serviceProvider = services.BuildServiceProvider();
+
+        var renderer = new TestRenderer(serviceProvider);
+        var component = (ComplexComponent)renderer.InstantiateComponent<ComplexComponent>();
+
+        _ = component.MyService;
+
+        await ((IAsyncDisposable)component).DisposeAsync();
+
+        // Verify all managed resources were disposed because disposing=true
+        Assert.True(component.TimerDisposed);
+        Assert.True(component.CancellationTokenSourceDisposed);
+        Assert.True(component.EventUnsubscribed);
+        Assert.Equal(1, component.ManagedResourcesCleanedUpCount);
+    }
+
+    private class ComplexComponent : OwningComponentBase<MyService>
+    {
+        private readonly System.Threading.Timer _timer;
+        private readonly CancellationTokenSource _cts;
+        private bool _eventSubscribed;
+
+        public MyService MyService => Service;
+        public bool TimerDisposed { get; private set; }
+        public bool CancellationTokenSourceDisposed { get; private set; }
+        public bool EventUnsubscribed { get; private set; }
+        public int ManagedResourcesCleanedUpCount { get; private set; }
+
+        public ComplexComponent()
+        {
+            _timer = new System.Threading.Timer(_ => { }, null, Timeout.Infinite, Timeout.Infinite);
+            _cts = new CancellationTokenSource();
+            _eventSubscribed = true;
+        }
+
+        protected override void Dispose(bool disposing)
+        {
+            if (disposing)
+            {
+                _timer?.Dispose();
+                TimerDisposed = true;
+
+                _cts?.Cancel();
+                _cts?.Dispose();
+                CancellationTokenSourceDisposed = true;
+
+                if (_eventSubscribed)
+                {
+                    EventUnsubscribed = true;
+                    _eventSubscribed = false;
+                }
+
+                ManagedResourcesCleanedUpCount++;
+            }
+
+            base.Dispose(disposing);
+        }
+    }
 }