Data Binding In Depth with C++/WinRT WinUI 3 on Desktop

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.