C＃秒表显示不正确的时间 [英] C# Stopwatch shows incorrect time

问题描述

我看到其他用户的帖子这显示出花Thread.sleep代码（5000）是大约5000毫秒秒表测量时间。

I have seen other user posts which show Stopwatch measuring time spent in "Thread.Sleep(5000)" to be around 5000ms.

但我的程序产生以下结果

But my program produces the following results

for (int i = 0; i < 20; ++i)
{
    Stopwatch sw = Stopwatch.StartNew();
    DateTime start = DateTime.Now;
    Thread.Sleep(5000);
    sw.Stop();
    Console.Out.WriteLine(
        "StopWatch Diff:" + 
        sw.ElapsedMilliseconds.ToString()); 
    Console.Out.WriteLine(
        "DateTime Diff:" + 
        DateTime.Now.Subtract(start).TotalMilliseconds.ToString());
}

---

---

StopWatch Diff:1684
DateTime Diff:5262.592
StopWatch Diff:1625
DateTime Diff:4997.12
StopWatch Diff:1604
DateTime Diff:4997.12
StopWatch Diff:1601
DateTime Diff:4997.12
StopWatch Diff:1690
DateTime Diff:4997.12
StopWatch Diff:1603

难道只是我，谁是观察这种行为？为什么秒表过5秒钟实际传递的措施1.6秒。这是该线程实际运行时间？

Is it just me who is observing this behaviour? Why stopwatch measures 1.6 seconds when 5 seconds have actually passed. It is the time that the thread is actually running?

推荐答案

的秒表类的不可靠。

这是没有一个恒定的时钟速率的处理器不可靠的（大多数处理器可以降低时钟速度以节约能源）。中对此有详细这里解释。

This is unreliable on processors that do not have a constant clock speed (most processors can reduce the clock speed to conserve energy). This is explained in detail here.

这篇关于C＃秒表显示不正确的时间的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！