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1、添加Timer控件，这个控件可以显示倒计时功能
2、Timer控件的Tick事件代码：
private void timerDownCount_Tick(object sender, EventArgs e) { string
dateDiff = null; //获取当前时间 DateTime DateTime1 = DateTime.Now; //第二天的00点00分00秒
DateTime DateTime2 = DateTime.Now.AddDays(1).Date; //计算两个时间相差多少秒 int sec =
(int)DateTime2.Subtract(DateTime1).TotalSeconds; if (sec == 0) {
//延迟1秒执行（为什么要延迟？如果不延迟，重启的瞬间两个时间差依然还是0，就会再次触发重启） Thread.Sleep(1000);
//--------------重启软件 start--------------- //开启新的实例
Process.Start(Application.ExecutablePath); //关闭当前实例
Process.GetCurrentProcess().Kill(); //--------------重启软件 end----------------- }
if (sec < 0) { this.timerDownCount.Stop(); } else { //把2个时间转成TimeSpan,方便计算
TimeSpan ts1 = new TimeSpan(DateTime1.Ticks); TimeSpan ts2 = new
TimeSpan(DateTime2.Ticks); //时间比较，得出差值 TimeSpan ts =
ts1.Subtract(ts2).Duration(); //结果 dateDiff = ts.Hours.ToString() + "小时" +
ts.Minutes.ToString() + "分钟" + ts.Seconds.ToString() + "秒";
this.labDownCount.Text = dateDiff; } }
