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App.xaml.cs

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+using Microsoft.UI.Windowing;
+using Microsoft.UI.Xaml.Media;
+using Microsoft.UI.Xaml.Navigation;
+using System;
+using Windows.Graphics;
+using WinRT.Interop;
+
+namespace TornadoAce_GSShop
+{
+    /// <summary>
+    /// Provides application-specific behavior to supplement the default Application class.
+    /// </summary>
+    public partial class App : Application
+    {
+        private Window? window;
+
+        /// <summary>
+        /// Initializes the singleton application object.  This is the first line of authored code
+        /// executed, and as such is the logical equivalent of main() or WinMain().
+        /// </summary>
+        public App()
+        {
+            this.InitializeComponent();
+        }
+
+        /// <summary>
+        /// Invoked when the application is launched normally by the end user.  Other entry points
+        /// will be used such as when the application is launched to open a specific file.
+        /// </summary>
+        /// <param name="e">Details about the launch request and process.</param>
+        protected override void OnLaunched(LaunchActivatedEventArgs e)
+        {
+            window ??= new Window
+            {
+                Title = "TornadoAce GS Shop"
+            };
+            window.SystemBackdrop = new MicaBackdrop();
+
+            if (window.Content is not Frame rootFrame)
+            {
+                rootFrame = new Frame();
+                rootFrame.NavigationFailed += OnNavigationFailed;
+                window.Content = rootFrame;
+            }
+
+            _ = rootFrame.Navigate(typeof(MainPage), e.Arguments);
+            ConfigureWindow(window);
+            window.Activate();
+        }
+
+        private static void ConfigureWindow(Window targetWindow)
+        {
+            var windowHandle = WindowNative.GetWindowHandle(targetWindow);
+            if (windowHandle == IntPtr.Zero)
+            {
+                return;
+            }
+
+            var windowId = Microsoft.UI.Win32Interop.GetWindowIdFromWindow(windowHandle);
+            var appWindow = AppWindow.GetFromWindowId(windowId);
+            appWindow.Resize(new SizeInt32(1440, 900));
+        }
+
+        /// <summary>
+        /// Invoked when Navigation to a certain page fails
+        /// </summary>
+        /// <param name="sender">The Frame which failed navigation</param>
+        /// <param name="e">Details about the navigation failure</param>
+        void OnNavigationFailed(object sender, NavigationFailedEventArgs e)
+        {
+            throw new Exception("Failed to load Page " + e.SourcePageType.FullName);
+        }
+    }
+}