WinUI 3 Desktop project demonstranting DataBindingInDepth
If you follow the Data binding in depth from Microsoft, starting from a WinUI 3 Desktop project, the App will compile and appear to work until you call
ViewModel().NextButtonText(L"Updated Next button text");
at that point the App will throw a
WinRT originate error - 0x8001010E : 'The application called an interface that was marshalled for a different thread.'.
The cause of the error is a namespace one. In HostViewModel.idl you should use Microsoft.UI.Xaml.Data.INotifyPropertyChanged not Windows.UI.....
The hope for this repository is to document the issue and provide a sample working project.