Wino-Mail/Wino.Mail.WinUI/App.xaml.cs

using System;
using Microsoft.UI.Xaml;

namespace Wino
{
    public partial class App : Application
    {
        public new static App Current => (App)Application.Current;
        public IServiceProvider Services { get; }

        public App()
        {
            this.InitializeComponent();
        }

        protected override void OnLaunched(LaunchActivatedEventArgs args)
        {
            m_window = new MainWindow();
            m_window.Activate();
        }

        private Window m_window;
    }
}