private void timerDownCount_Tick(object sender, EventArgs e)
    {
      string dateDiff = null;
      //獲取當(dāng)前時(shí)間
      DateTime DateTime1 = DateTime.Now;
      //第二天的00點(diǎn)00分00秒
      DateTime DateTime2 = DateTime.Now.AddDays(1).Date;     
      //計(jì)算兩個(gè)時(shí)間相差多少秒
      int sec = (int)DateTime2.Subtract(DateTime1).TotalSeconds;     
      if (sec == 0)
      {
        //延遲1秒執(zhí)行（為什么要延遲？如果不延遲，重啟的瞬間兩個(gè)時(shí)間差依然還是0，就會(huì)再次觸發(fā)重啟）
        Thread.Sleep(1000);
        //--------------重啟軟件 start---------------
        //開啟新的實(shí)例
        Process.Start(Application.ExecutablePath);
        //關(guān)閉當(dāng)前實(shí)例
        Process.GetCurrentProcess().Kill();
        //--------------重啟軟件 end-----------------     
      }
      if (sec < 0)
      {
        this.timerDownCount.Stop();
      }
      else
      {
        //把2個(gè)時(shí)間轉(zhuǎn)成TimeSpan,方便計(jì)算
        TimeSpan ts1 = new TimeSpan(DateTime1.Ticks);
        TimeSpan ts2 = new TimeSpan(DateTime2.Ticks);
        //時(shí)間比較，得出差值
        TimeSpan ts = ts1.Subtract(ts2).Duration();  
        //結(jié)果
        dateDiff = ts.Hours.ToString() + "小時(shí)" + ts.Minutes.ToString() + "分鐘" + ts.Seconds.ToString() + "秒";
        this.labDownCount.Text = dateDiff;
      }
 }