初始版本

TodoList/Views/MainWindow.xaml

@@ -7,10 +7,11 @@
         xmlns:models="clr-namespace:TodoList.Models"
         xmlns:converters="clr-namespace:TodoList.Converters"
         mc:Ignorable="d"
-        Title="待办事项" Height="600" Width="450"
+        Title="{Binding AppVersion, StringFormat='待办事项 v{0}'}" Height="600" Width="450"
         Background="#F5F5F7"
         Icon="/icon.ico"
-        WindowStartupLocation="CenterScreen">
+        WindowStartupLocation="CenterScreen"
+        PreviewKeyDown="Window_PreviewKeyDown">
     
     <Window.Resources>
         <ObjectDataProvider x:Key="PriorityEnum" MethodName="GetValues"

TodoList/Views/MainWindow.xaml.cs

@@ -19,6 +19,25 @@ namespace TodoList.Views
             // Verify if app shuts down? No, ShutdownMode is Explicit.
         }
 
+        private void Window_PreviewKeyDown(object sender, System.Windows.Input.KeyEventArgs e)
+        {
+            if (e.Key == Key.Escape)
+            {
+                // If settings are open, close settings? 
+                // But user requirement is "Equals pressing X button", which usually means Close/Hide window.
+                // However, if we want better UX:
+                if (DataContext is MainViewModel vm && vm.IsSettingsOpen)
+                {
+                    vm.IsSettingsOpen = false;
+                    e.Handled = true;
+                    return;
+                }
+
+                // Default behavior: Close (Hide) Window
+                Close();
+            }
+        }
+
         private void ShortcutBox_PreviewKeyDown(object sender, System.Windows.Input.KeyEventArgs e)
         {
             e.Handled = true;