Content Dialog - XAML Islands Winforms C#

Question

Hi I am using the XAML Islands technology in Winforms .net core 3.1.
Now under a UWP Button click I am trying the following:

 ContentDialog dialog = new ContentDialog();  
            dialog.Title = "Save your work?";  
            dialog.PrimaryButtonText = "Save";  
            dialog.SecondaryButtonText = "Don't Save";  
            dialog.CloseButtonText = "Cancel";  
            dialog.DefaultButton = ContentDialogButton.Primary;  
            dialog.Content = "Somethng";  
            var result = await dialog.ShowAsync();  
  

But with this code, I am getting the following exception:

What is the problem?
Does content dialog have a problem in WinForms?
Also how do I add a keyboard Accelerator to the button in Winforms c#?

Answer 1

You must set XamlRoot :

For example, in the Button click :

 Windows.UI.Xaml.DependencyObject parent = ((Windows.UI.Xaml.FrameworkElement)sender).Parent;  
 dialog.XamlRoot = ((Windows.UI.Xaml.UIElement)parent).XamlRoot;