wpf 处理倒计时问题

  private DispatcherTimer TimeClose;  //定义

 TimeClose = new DispatcherTimer();
            TimeClose.Tick += new EventHandler(TimeClose_Tick);
            TimeClose.Interval = new TimeSpan(0, 0, 1);
            TimeClose.Start();

 void TimeClose_Tick(object sender, EventArgs e)
        {
            Count++;
            if (Count > 300)
            {
                TimeClose.Stop();
                GoMainWindow();
            }
        }