WPF制作一个简单的倒计时器实例附源码(2)


  private int countSecond=300; //记录秒数
  private void UserControl_Loaded(object sender, RoutedEventArgs e)
  {
    private DispatcherTimer disTimer = new DispatcherTimer();
    disTimer.Interval = new TimeSpan(0, 0, 0, 1); //参数分别为:天,小时,分,秒。此方法有重载,可根据实际情况调用。
    disTimer.Tick += new EventHandler(disTimer_Tick); //每一秒执行的方法
    disTimer.Start();
  }
  void disTimer_Tick(object sender, EventArgs e)
  {
    if(countSecond==0)
    {
      MessageBox.Show("结束");
    }
    else
    {
      //判断lblSecond是否处于UI线程上
      if (lblSecond.Dispatcher.CheckAccess())
      {
        lblSecond.Content=countSecnd.ToString();
      }
      else
      {
        lblSecond.Dispatcher.BeginInvoke(DispatcherPriority.Normal,(Action)(() =>{
          lblSecond.Content=countSecond.ToString();
        }));  
      }
      countSecond--;
    }
  }

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