C#里如何不用time.h里面的函数来获取时间间隔？

用 System.Diagnostics.Stopwatch 类
实例:
Stopwatch watch = new Stopwatch();
watch.Start();
for(int i=0;i<10;i++)
{
Thread.Sleep(100);
}
watch.Stop();
Console.WriteLine("Work on {0}ms", watch.ElapsedMilliseconds);