DateTime.Ticks没有一项决议，AF为100 ns？ [英] DateTime.Ticks does NOT have a resolution af 100 ns?

问题描述

可能重复：
   C＃DateTime.Now precision

有在.NET SO对于高分辨率定时几个问题，其中指出（如MSDN文档）的DateTime.Ticks具有100纳米秒resulution。

There are a few questions on SO regarding high-resolution timing in .NET where it is stated (as in the MSDN documentation) that the DateTime.Ticks has a resulution of 100 nano-seconds.

但是，这似乎不是在所有的情况在现实生活中。 如果我运行code以下，我希望它来生成线，那里的刻度值变化的每一行，其中很多线路都与相同Milisecond值。 但它没有 - 蜱值保持不变，直到milisecond值下一班，加上没什么时间戳的分辨率

But this seem not to be the case at all in real-life. If I run the code below, I would expect it to generate lines, where the Tick value varies for each line, where a lot of lines are with the the same Milisecond value. But it doesn't - the ticks value stays the same until next shift in milisecond value, adding nothing to the resolution of the time-stamp.

private static List<string> GetTimeLine(long iterations)
{
    List<string> liste = new List<string>();
    for (long i = 0; i <= iterations; i++)
    {
        liste.Add(DateTime.Now.Millisecond.ToString() + " - " + DateTime.Now.Ticks.ToString());
    }

    return liste;
}

static void Main(string[] args)
{
    Console.WriteLine("Generating timeline");
    guids = GetTimeLine(10000);
    File.WriteAllLines(@"C:\Test\GUIDS.TXT", guids);
    Console.WriteLine("File written - Press ENTER");
    Console.ReadLine();
}

结果输出的例子：

Example of result output:

...
  867 - 634940160118679615

...
867 - 634940160118679615

867 - 634940160118679615

867 - 634940160118679615

867 - 634940160118679615

867 - 634940160118679615

867 - 634940160118679615

867 - 634940160118679615

867 - 634940160118679615

867 - 634940160118679615

868 - 634940160118689616

868 - 634940160118689616

868 - 634940160118689616

868 - 634940160118689616

868 - 634940160118689616

868 - 634940160118689616

...

那么，什么是方法获取超过毫秒的分辨率在.NET？

So what is the method for getting more than miliseconds resolution in .NET?

推荐答案

测量经过时间在C＃中最准确的方法是使用的秒表类。

The most accurate way of measuring elapsed time in C# is to use the Stopwatch class.

本采用微处理器的性能计数器，通过调用的 QueryPerformanceCounter的。

This uses the microprocessor's performance counter, implemented with calls to QueryPerformanceCounter.

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