WPF 单例窗口Close()后再Show()

WPF  单例窗口Close()后再Show()会报错，Close会调用Dispose，资源会马上被释放，ShowDialog()的情形是一样的。

重载OnClosing(CancelEventArgs e)方法，使用Hide()方法。

 public partial class SingletonWin : Window
    {
       #region 单件实例

        private static SingletonWin _instance;
        private static readonly object ObjLok = new object();
        private SingletonWin()
        {
            InitializeComponent();
        }

        public static SingletonWin Instance()
        {
            lock (ObjLok)
            {
                return _instance ?? (_instance = new SingletonWin());
            }
        }

        #endregion

        private void CloseBtn_OnClick(object sender, RoutedEventArgs e)
        {
            Close();
        }

        /// <summary> 重写Close,窗口关闭时设置为隐藏。
        /// </summary>
        protected override void OnClosing(CancelEventArgs e)
        {
            Hide();
            e.Cancel = true;
        }
    }