WPF_双击改变窗口状态

        public Window5()        {            InitializeComponent();            this.topborder.MouseDown += topborder_MouseDown;        }        private void topborder_MouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)        {            if (e.ClickCount == 2)                this.WindowState = this.WindowState == WindowState.Maximized ? WindowState.Normal : WindowState.Maximized;        }