如何测量一段代码的运行时间
时间：2011-02-23 来源：郑文亮
using System.Diagnostics;
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
// do something...
stopwatch.Stop();
long spendTime = stopwatch.ElapsedMilliseconds;
注解: spendTime 就是花费的时间 (以毫秒为单位)
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