How to use Xaml Islands in a .NET WPF App?

[AchimStuy]

With the release of Xaml Islands for Windows App SDK - how to use WinUI 3 Controls in a WPF app?

I am stuck with a COMException: The group or resource is not in the correct state to perform the requested operation.

It is documented, how to use Windows App SDK features like ResourceManager (https://learn.microsoft.com/en-us/windows/apps/windows-app-sdk/wpf-plus-winappsdk), but all search for xaml islands leads to the old Community Toolkit documentation.

[castorix]

I had posted a test sample (WPF_XAML_Islands_WinUI3)

[DarranRowe]

As a reference, this is the C++ sample.
This includes everything you need to emulate, including the call to ContentPreTranslateMessage and the stuff for navigation into and out of the island.

[myth384]

Microsoft.Toolkit.Win32 has a XAML Control WindowsXamlHost to host a UWP Control inside WPF or Winforms projects. It acts as a convenience wrapper around DesktopWindowXamlSource. This feature was removed in Windows Community Toolkit 8, reasoning that Windows App SDK 1.4 introduced XAML Islands... as you may have guessed in the form of DesktopWindowXamlSource...
I created an issue on Github of Windows Community Toolkit to reintroduce the wrappers to work with WinUI 3.