添加项目文件。

Commands/ClosingWindowBehavior.cs

@@ -0,0 +1,54 @@
+
+using System.ComponentModel;
+using System.Windows;
+using System.Windows.Input;
+using System.Windows.Interactivity;
+namespace YwxApp.AiChat.Commands
+{
+
+   
+        /// <summary>
+        /// Close Window Behavior
+        /// </summary>
+        public class ClosingWindowBehavior : Behavior<Window>
+        {
+            public static readonly DependencyProperty CommandProperty =
+                DependencyProperty.Register("Command", typeof(ICommand), typeof(ClosingWindowBehavior), new PropertyMetadata(null));
+
+            public static readonly DependencyProperty CommandParameterProperty =
+                DependencyProperty.Register("CommandParameter", typeof(object), typeof(ClosingWindowBehavior), new PropertyMetadata(null));
+
+            public ICommand Command
+            {
+                get { return (ICommand)GetValue(CommandProperty); }
+                set { SetValue(CommandProperty, value); }
+            }
+
+            public object CommandParameter
+            {
+                get { return GetValue(CommandParameterProperty); }
+                set { SetValue(CommandParameterProperty, value); }
+            }
+
+            protected override void OnAttached()
+            {
+                base.OnAttached();
+                AssociatedObject.Closing += OnClosing;
+            }
+
+            protected override void OnDetaching()
+            {
+                base.OnDetaching();
+                AssociatedObject.Closing -= OnClosing;
+            }
+
+            private void OnClosing(object sender, CancelEventArgs e)
+            {
+                if (Command != null && Command.CanExecute(CommandParameter))
+                {
+                    Command.Execute(e);
+                }
+            }
+        }
+    }
+