How to Show User Dialog on UI Thread for Global Unhandled Exceptions in .NET MAUI with WinUI 3?

I'm migrating a Xamarin.Forms project with UWP to .NET MAUI with WinUI3 (multi project app).

I need to implement a similar global exception handling logic in my MAUI project with WinUI 3. Although I'm able to trigger the method when an unhandled exception occurs, showing a user dialog on top of the UI thread in the specific page where the issue occurred doesn't seem to work in WinUI 3.

In my Xamarin.Forms project, I handled global unhandled exceptions by logging them and displaying a dialog on the current page using the following code in App.xaml.cs:

Application.Current.UnhandledException += All_UnhandledException;

private async void All_UnhandledException(object sender, Windows.UI.Xaml.UnhandledExceptionEventArgs e) { try { var exception = e.Exception; var crashLog = "Unhandled Exception | Message: " + exception.Message + " | Target Method: " + exception.TargetSite.Name + " | Target Class: " + exception.TargetSite.DeclaringType.FullName;

    Log.Fatal(crashLog, exception);

    e.Handled = true;

    await CoreApplication.MainView.CoreWindow.Dispatcher.RunAsync(CoreDispatcherPriority.Normal,
      async () =>
      {
          var showDialog = new MessageDialog("Caught the unhandled exception");
          await showDialog.ShowAsync();
      });
}
catch (Exception ex)
{                
    Log.Fatal($"Error while handling Unhandled exception: {ex.Message}");                    
}

}

How can I achieve this in a .NET MAUI project with WinUI 3? Any guidance or sample code would be greatly appreciated.

Use ContentDialog control.

To know more, Refer this page on how to use ContentDialog

Also, you need to use Task.Async() and await for this.