Bug: MarshalInspectable.CreateMarshaler exhibits different behaviors and results in UWP and WinUI 3

[Gaoyifei1011]

Description

MarshalInspectable.CreateMarshaler exhibits different behaviors and results in UWP and WinUI 3

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MarshalInspectable.CreateMarshaler 在 UWP 和 WinUI 3 中表现出不同的行为和结果

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Steps To Reproduce

1. Create WinUI 3 and UWP blank projects, the configuration used by the project: .NET 9 rc 2, CsWinRT 2.1.6, Windows App SDK 1.6.240923002
2. After the application is initialized, add the following code:

TypedEventHandler<CoreWindow, object> windowPositionChangedEventHandler = new(OnWindowPositionChanged);
IObjectReference objectReference = MarshalInterface<TypedEventHandler<CoreWindow,object>>.CreateMarshaler(windowPositionChangedEventHandler);

3. An exception occurred in UWP and the WinUI 3 project executed smoothly.

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1.创建 WinUI 3 和 UWP 空白项目，项目使用的配置： .NET 9 rc 2，CsWinRT 2.1.6，Windows App SDK 1.6.240923002 2.应用初始化完成后，添加如下代码

TypedEventHandler<CoreWindow, object> windowPositionChangedEventHandler = new(OnWindowPositionChanged);
IObjectReference objectReference = MarshalInterface<TypedEventHandler<CoreWindow,object>>.CreateMarshaler(windowPositionChangedEventHandler);

3.在 UWP 中发生了异常，WinUI 3 项目顺利执行。

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Expected Behavior

The above types of code will hopefully be called smoothly in UWP as well

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上述类型代码希望也可以在 UWP 中顺利调用

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Version Info

CsWinRT 2.1.6 .NET 9 RC2 Windows App SDK 1.6.240923002 Visual Studio 2022 17.12.preview 4.0

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Additional Context

ScreenShot（截图）

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UWP

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WinUI 3

[dongle-the-gadget]

You're likely using WinUI 3 without enabling <PublishAot>, which causes different behavior due to IsDynamicCodeCompiled returning false, not due to UWP and WinUI 3 differences. Chances are if you enable that property on WinUI 3 as well you would also see that exception.

[devsko]

Add <DynamicCodeSupport>true</DynamicCodeSupport> to your UWP .csproj. Only works without AOT.

[Gaoyifei1011]

You're likely using WinUI 3 without enabling <PublishAot>, which causes different behavior due to IsDynamicCodeCompiled returning false, not due to UWP and WinUI 3 differences. Chances are if you enable that property on WinUI 3 as well you would also see that exception.

Nowhere. When I turned on aot in the winui3 project, it did throw the same exceptions as the uwp project. So do you have a solution for non-dynamic code? Thank you very much

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确实。当我在winui3项目中开启了aot后发现它确实抛出了和uwp项目一样的异常。所以想问一下您有针对非动态代码的解决方案吗？非常感谢

[dongle-the-gadget]

Nope, it's just unsupported.

[Gaoyifei1011]

Nope, it's just unsupported.

All right. I can now do this only by temporarily replacing the generic TypedEventHandler with a non-generic EventHandler.

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好吧。我现在只能用非泛型的 EventHandler 临时替代泛型的 TypedEventHandler 来完成这一任务了。