Stopwatch定时器测量代码中不同任务执行时间

 Stopwatch sw = new Stopwatch();
  sw.Start();
  //任务123
  Console.WriteLine("{0, 4}ms",sw.Elapsed.TotalMilliseconds);
  //MessageBox.Show(string.Format("查询耗时{0, 4}ms", sw.Elapsed.TotalMilliseconds), "提示");