Some fixes

AmiReel.WinUI/MainWindow.xaml.cs

@@ -1,4 +1,6 @@
+using Microsoft.UI.Windowing;
 using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
 using System;
 using System.IO;
 
@@ -14,6 +16,8 @@ namespace AmiReel_WinUI;
 /// </summary>
 public sealed partial class MainWindow : Window
 {
+    private bool _exitConfirmed;
+
     public MainWindow()
     {
         InitializeComponent();
@@ -27,5 +31,29 @@ public sealed partial class MainWindow : Window
 
         // Navigate the root frame to the main page on startup.
         RootFrame.Navigate(typeof(MainPage));
+
+        AppWindow.Closing += AppWindow_Closing;
+    }
+
+    private async void AppWindow_Closing(AppWindow sender, AppWindowClosingEventArgs args)
+    {
+        if (_exitConfirmed) return;
+        args.Cancel = true;
+
+        ContentDialog dialog = new()
+        {
+            Title = "Exit AmiReel?",
+            Content = "Are you sure you want to close the application?",
+            PrimaryButtonText = "Exit",
+            CloseButtonText = "Cancel",
+            DefaultButton = ContentDialogButton.Close,
+            XamlRoot = RootFrame.XamlRoot
+        };
+
+        ContentDialogResult result = await dialog.ShowAsync();
+        if (result != ContentDialogResult.Primary) return;
+
+        _exitConfirmed = true;
+        Close();
     }
 }