C# StopWatch的使用

        static void Main(string[] args)
        {
            Console.WriteLine("Main Start....");
            Stopwatch sw = new Stopwatch();
            sw.Start();
            Thread.Sleep(3000);
            sw.Stop();
            Console.WriteLine("time elapsed "+sw.ElapsedMilliseconds);
            sw.Restart();                            //置0，并重新开始计时,     如果直接使用Start(),必须先调用Reset()置0
            Thread.Sleep(3000);
            sw.Stop();
            Console.WriteLine("Main end...." + sw.Elapsed);
            Console.ReadLine();
        }