using System;

using Microsoft.UI.Dispatching;

using Microsoft.UI.Xaml;

using Microsoft.UI.Xaml.Controls;

namespace HelloWinUI;

public class App : Application

{

private Window? _window;

protected override void OnLaunched(LaunchActivatedEventArgs args)

{

var root = new Grid();

_window = new Window

{

Title = "WinUI",

Content = root,

};

root.Loaded += OnRootLoaded;

_window.Activate();

}

private async void OnRootLoaded(object sender, RoutedEventArgs e)

{

var root = (FrameworkElement)sender;

root.Loaded -= OnRootLoaded;

var dialog = new ContentDialog

{

XamlRoot = root.XamlRoot,

Title = "WinUI",

Content = $"WinUI: {typeof(Application).Name}",

CloseButtonText = "OK",

};

await dialog.ShowAsync();

_window?.Close();

Exit();

}

}

public static class Program

{

[STAThread]

public static void Main()

{

Application.Start(p =>

{

var context = new DispatcherQueueSynchronizationContext(

DispatcherQueue.GetForCurrentThread());

System.Threading.SynchronizationContext.SetSynchronizationContext(context);

_ = new App();

});

}

}