App.xaml.cs

using System;

using HyprWinUI3.Services;

using Windows.ApplicationModel.Activation;
using Windows.UI.Xaml;

namespace HyprWinUI3
{
	public sealed partial class App : Application
	{
		private Lazy<ActivationService> _activationService;

        private ActivationService ActivationService => _activationService.Value;

        public App()
		{
			InitializeComponent();
			UnhandledException += OnAppUnhandledException;

			// Deferred execution until used. Check https://docs.microsoft.com/dotnet/api/system.lazy-1 for further info on Lazy<T> class.
			_activationService = new Lazy<ActivationService>(CreateActivationService);
		}

		protected override async void OnLaunched(LaunchActivatedEventArgs args)
		{
			DebugSettings.EnableFrameRateCounter = true;
			if (!args.PrelaunchActivated)
			{
				await ActivationService.ActivateAsync(args);
			}
		}

		protected override async void OnActivated(IActivatedEventArgs args)
		{
			await ActivationService.ActivateAsync(args);
		}

		private void OnAppUnhandledException(object sender, Windows.UI.Xaml.UnhandledExceptionEventArgs e)
		{
			// TODO WTS: Please log and handle the exception as appropriate to your scenario
			// For more info see https://docs.microsoft.com/uwp/api/windows.ui.xaml.application.unhandledexception
		}

		private ActivationService CreateActivationService()
		{
			return new ActivationService(this, typeof(Views.TabViewPage), new Lazy<UIElement>(CreateShell));
		}

		private UIElement CreateShell()
		{
			return new Views.ShellPage();
		}
	}
}