Fix EventCallback Net8.0 (#150)

* feat: add early fix for EventCallback equality comparison

* feat: add correct types to acessors

* fix: commented out UnsafeAccessor for EventCallback<T>

* chore: Add explining comments

---------

Co-authored-by: Oleksandr Liakhevych <[email protected]>

src/BlazorBindings.Core/NativeControlComponentBase.cs

@@ -3,6 +3,7 @@
 
 using Microsoft.AspNetCore.Components;
 using Microsoft.AspNetCore.Components.Rendering;
+using System.Runtime.CompilerServices;
 using System.Runtime.ExceptionServices;
 
 namespace BlazorBindings.Core;
@@ -30,6 +31,19 @@ public virtual Task SetParametersAsync(ParameterView parameters)
         return Task.CompletedTask;
     }
 
+    // Equals methods are overridden only as a workaround to this issue:
+    // https://github.com/dotnet/aspnetcore/issues/53361
+    protected static bool Equals(EventCallback e1, object e2)
+        => e2 is EventCallback other
+        && ReferenceEquals(GetReceiver(ref e1), GetReceiver(ref other))
+        && Equals(GetDelegate(ref e1), GetDelegate(ref other));
+
+    // TODO: uncomment on dotnet9.0
+    //protected static bool Equals<T>(EventCallback<T> e1, object e2)
+    //    => e2 is EventCallback<T> other
+    //    && ReferenceEquals(GetReceiver(ref e1), GetReceiver(ref other))
+    //    && Equals(GetDelegate(ref e1), GetDelegate(ref other));
+
     protected virtual void BuildRenderTree(RenderTreeBuilder builder)
     {
         if (_eventCallbackException != null)
@@ -165,4 +179,20 @@ void IComponent.Attach(RenderHandle renderHandle)
     {
         _renderHandle = renderHandle;
     }
+
+
+    [UnsafeAccessor(UnsafeAccessorKind.Field, Name = "Receiver")]
+    extern static ref IHandleEvent GetReceiver(ref EventCallback _this);
+
+    [UnsafeAccessor(UnsafeAccessorKind.Field, Name = "Delegate")]
+    extern static ref MulticastDelegate GetDelegate(ref EventCallback _this);
+
+    // Unfortunately can't use with generics https://github.com/dotnet/runtime/issues/89439
+    // TODO: uncomment on dotnet9.0
+
+    //[UnsafeAccessor(UnsafeAccessorKind.Field, Name = "Receiver")]
+    //extern static ref IHandleEvent GetReceiver<[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)] T>(ref EventCallback<T> _this);
+
+    //[UnsafeAccessor(UnsafeAccessorKind.Field, Name = "Delegate")]
+    //extern static ref MulticastDelegate GetDelegate<[DynamicallyAccessedMembers(DynamicallyAccessedMemberTypes.All)] T>(ref EventCallback<T> _this);
 }