C# 如何将秒表刻度转换为纳秒、毫秒和秒？

How do you convert Stopwatch ticks to nanoseconds, milliseconds and seconds?

提问by Scott Davies

This is a very basic question...quite embarassing, but here goes:

这是一个非常基本的问题......很尴尬，但这里是：

I have a Stopwatch block in C# code. I determine the elapsed time in ticks and then want to convert to ns, ms, s. I know that the Frequency is provided by the Stopwatch class and that it is required for conversion.

我在 C# 代码中有一个秒表块。我以滴答为单位确定经过的时间，然后想转换为 ns、ms、s。我知道频率是由秒表类提供的，并且它是转换所必需的。

Thanks

谢谢

采纳答案by RedFilter

Stopwatch.Elapsed is a TimeSpan, so you can do myStopwatch.Elapsed.TotalMilliseconds, myStopwatch.Elapsed.TotalSeconds, etc.

Stopwatch.Elapsed是一个时间跨度，所以你可以做myStopwatch.Elapsed.TotalMilliseconds，myStopwatch.Elapsed.TotalSeconds等等。

// Create new stopwatch
Stopwatch stopwatch = new Stopwatch();

// Begin timing
stopwatch.Start();

// Do something
for (int i = 0; i < 1000; i++)
{
    Thread.Sleep(1);
}

// Stop timing
stopwatch.Stop();

// Write result
Console.WriteLine("Time elapsed (s): {0}", stopwatch.Elapsed.TotalSeconds);
Console.WriteLine("Time elapsed (ms): {0}", stopwatch.Elapsed.TotalMilliseconds);
Console.WriteLine("Time elapsed (ns): {0}", stopwatch.Elapsed.TotalMilliseconds * 1000000);

Output:

输出：

Time elapsed (s): 2.4976622
Time elapsed (ms): 2497.6622
Time elapsed (ns): 2497662200

Notethat stopwatch.ElapsedMillisecondsreturns a longand is thus only precise up to the millisecond, while stopwatch.Elapsed.TotalMillisecondsreturns a doubleand has the same precisionas stopwatch.ElapsedTicks, except it's easier to use. ILSpy shows that TimeSpan.TotalMillisecondsis computed using ticks anyway.

注意的是stopwatch.ElapsedMilliseconds回报long，因此只精确到毫秒，而stopwatch.Elapsed.TotalMilliseconds回报double和具有相同的精度为stopwatch.ElapsedTicks，但它更容易使用。ILSpy 显示TimeSpan.TotalMilliseconds无论如何都是使用刻度计算的。

回答by Zach Johnson

According to MSDN, Frequency tells you the number of ticks per second. Therefore:

根据MSDN，频率告诉您每秒的滴答数。所以：

Stopwatch sw = new Stopwatch();
// ...
double ticks = sw.ElapsedTicks;
double seconds = ticks / Stopwatch.Frequency;
double milliseconds = (ticks / Stopwatch.Frequency) * 1000;
double nanoseconds = (ticks / Stopwatch.Frequency) * 1000000000;

回答by SLaks

Use the Elapsedproperty:

使用Elapsed属性：

stopwatch.Elapsed.TotalMilliseconds

回答by John Weldon

From the MSDN docs:

从MSDN 文档：

Use the Frequencyand IsHighResolutionfields to determine the precision and resolution of the Stopwatch timing implementation.

使用Frequency和IsHighResolution字段来确定秒表计时实现的精度和分辨率。

long frequency = Stopwatch.Frequency;
Console.WriteLine("  Timer frequency in ticks per second = {0}",
    frequency);
long nanosecPerTick = (1000L*1000L*1000L) / frequency;
Console.WriteLine("  Timer is accurate within {0} nanoseconds", 
    nanosecPerTick);

回答by Reed Copsey

Stopwatch.Frequencygives you ticks/second.

秒表。频率为您提供滴答/秒。

So, if you have ticks, you can just divide by frequency to get seconds:

所以，如果你有刻度，你可以用频率除以得到秒数：

long ticks = sw.ElapsedTicks;
double ns = 1000000000.0 * (double)ticks / Stopwatch.Frequency;
double ms = ns / 1000000.0;
double s = ms / 1000;

For example, you can do:

例如，您可以执行以下操作：

static void Main()
{
    Stopwatch sw = new Stopwatch();
    sw.Start();
    System.Threading.Thread.Sleep(3456);
    sw.Stop();

    long ticks = sw.ElapsedTicks;
    double ns = 1000000000.0 * (double)ticks / Stopwatch.Frequency;
    double ms = ns / 1000000.0;
    double s = ms / 1000;

    Console.WriteLine("{0}, {1}, {2}", ns, ms, s);
    Console.ReadKey();
}

Which, on my system, prints:

其中，在我的系统上，打印：

3455650175.58075, 3455.65017558075, 3.45565017558075

回答by Kornél Regius

Use this class:

使用这个类：

public static class Utility
{
    public static long ElapsedNanoSeconds(this Stopwatch watch)
    {
         return watch.ElapsedTicks * 1000000000 / Stopwatch.Frequency;
    }
    public static long ElapsedMicroSeconds(this Stopwatch watch)
    {
        return watch.ElapsedTicks * 1000000 / Stopwatch.Frequency;
    }
}

Then you can get the elapsed nanoseconds/microseconds just like this:

然后你可以像这样获得经过的纳秒/微秒：

var stopwatch = Stopwatch.StartNew();
//... measured code part
Console.WriteLine(stopwatch.ElapsedNanoSeconds());
// OR
Console.WriteLine(stopwatch.ElapsedMicroSeconds());

For milliseconds you can use the ElapsedMilliseconds() method of Stopwatch.

对于毫秒，您可以使用秒表的 ElapsedMilliseconds() 方法。