private static System.Windows.Threading.DispatcherTimer readDataTimer = null; //用于触发定时器
//倒计时
readDataTimer = new System.Windows.Threading.DispatcherTimer();
readDataTimer.Tick += new EventHandler(ShowLayer);
readDataTimer.Interval = new TimeSpan(0, 0, 0, 2);
readDataTimer.Start();
private void CountDown(object sender, EventArgs e)
{
//写你需要执行的代码
}