C#中时间间隔的两种计算方法

1、

System.Diagnostics.Stopwatch watch = new  Stopwatch();
watch.Start();
..........
..........
watch.Stop();
watch.Elapsed;

2、
 

DateTime oldTime = DateTime.Now;
........
........
TimeSpan ts = DateTime.Now.Subtract(oldTime);
(ts.TotalMinutes * 60000 ).ToString(); // 毫秒