Microsoft.UI.Xaml.Markup.XamlParseException: 'The text associated with this error code could not be found.

[hippieZhou]

Describe the bug

I met this error when I upgraded Microsoft.WindowsAppSDK to '1.6.240701003-experimental2'.

Steps to reproduce the bug

1. set TargetType for controls:SwitchPresenter control
2. upgrade Microsoft.WindowsAppSDK to '1.6.240701003-experimental2'.

Expected behavior

No Exception

Screenshots

NuGet package version

Windows App SDK 1.6 Experimental 2: 1.6.240701003-experimental2

Packaging type

Packaged (MSIX), Unpackaged

Windows version

No response

IDE

Visual Studio 2022

Additional context

No response

[evelynwu-msft]

@hippieZhou Could you provide a repro project? I'm not familiar with this control and the snippet in the screenshot isn't enough for me to be confident that I've recreated your scenario faithfully. Additionally, what version of Windows App SDK were you originally using before upgrading?

[evelynwu-msft]

@manodasanW Did something change recently in how C#/WinRT projects Windows.UI.Xaml.Interop.TypeName to System.Type? In the repro project the WinUI framework is passing an object of type Windows.UI.Xaml.Interop.TypeName to the managed generated IXMP. If the project (targeting WinAppSDK 1.5.5) specifies <WindowsSdkPackageVersion>10.0.19041.35-preview</WindowsSdkPackageVersion> then an InvalidCastException is raised because the object is projected to type WinRT.IInspectable. If the aforementioned WindowsSdkPackageVersion override is commented out, then the object has the projected type System.Type as expected.

[manodasanW]

Was able to repro it and can confirm this is fixed in the upcoming CsWinRT preview.

Fixed by microsoft/CsWinRT#1646

[evelynwu-msft]

Was able to repro it and can confirm this is fixed in the upcoming CsWinRT preview.

Fixed by microsoft/CsWinRT#1646

Awesome, thanks!

[hippieZhou]

@manodasanW if so, how can I resolve this issue in my project currently?

[JesseCol]

Hi, the latest update of C#/WinRT should have the fix. Thanks!