C#获取代码执行时间（精确到毫秒）

         private void Time(int i)
         {
            Stopwatch sw = new Stopwatch();
            sw.Start();
            Thread.Sleep(i);
            sw.Stop();
            Console.WriteLine(sw.ElapsedTicks / (decimal)Stopwatch.Frequency * 1000);
         }
   

 在main函数中调用Time(1000); 定时1000ms，

 控制台显示实际运行时间：999.9807566979519995073714676