WinUI 3 App - InitializeComponent Fails with WinRT Error and TypeInitializationException

[DhivyaBharathi-SF3890]

Describe the bug

This is a minimal WinUI 3 desktop app written in C++, hosting a WinUI 3 runtime component written in C# to display the Community Toolkit DataGrid.

When attempting to declare the DataGrid in a XAML file, InitializeComponent fails with the WinRT error 0x802B000A: 'Cannot create instance of type Microsoft.UI.Xaml.Controls.XamlControlsResources'.

When loading the DataGrid in the code-behind, a System.TypeInitializationException occurs, with the internal exception being a NullReferenceException: 'Object reference not set to an instance of an object'.

Steps to reproduce the bug

However, our host application is written in winrt/c++, which means we have to load the components as external winui3-runtime components.

Expected behavior

WinRT Error and TypeInitializationException should not occur.

Screenshots

No response

NuGet package version

None

Windows version

No response

Additional context

Any suggestions for resolving this issue?

[github-actions]

Hi I'm an AI powered bot that finds similar issues based off the issue title.

Please view the issues below to see if they solve your problem, and if the issue describes your problem please consider closing this one. Thank you!

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[codendone]

Can you attach a repro project?

[DhivyaBharathi-SF3890]

DataGrid.zip

I have attached the sample

[DhivyaBharathi-SF3890]

Any update on this?