C#写计时器：

System.Diagnostics.Stopwatch watch = new System.Diagnostics.Stopwatch();
watch.Start();//开始计时
　　　　　　　
int count=0;
for (int i = 0; i < 10000; i++)
{
count++;
}
watch.Stop();//停止计时

Console.WriteLine("共耗时:" + (watch.ElapsedMilliseconds));//输出时间--毫秒

Console.ReadKey();