Nested x:TypeArguments: "Type was not found" error.

[Wirox]

When using a nested generic type argument with the x:TypeArguments directive (such as Nullable<bool>), the following error is incorrectly shown in the XAML file:

When you actually run the application, it works fine.

I'm using Visual Studio 2022 17.11.4.

[karkarl]

This looks like an issue with IntelliSense with Visual Studio.

[Wirox]

@karkarl Yeah, I wasn't quite sure where the issue lies. Do you know if this should be reported in https://github.com/dotnet/roslyn then?

[karkarl]

@karkarl Yeah, I wasn't quite sure where the issue lies. Do you know if this should be reported in https://github.com/dotnet/roslyn then?

You can try opening an issue there. In the meantime, this bug will routed internally to Visual Studio.

[Wirox]

@karkarl Thanks, opened an issue there: dotnet/wpf#10050
Not sure if it means this one should be closed, but feel free to do that.

[evelynwu-msft]

Marking issue as closed as it's related to WPF and not WinUI 3, and a bug has been opened in the corresponding repo.