如何将秒表刻度转换为纳秒，毫秒和秒？

Question

这是一个非常基本的问题...很尴尬，但这里有：

我有一个C＃代码中的秒表块。我以滴答确定流逝的时间，然后想转换为ns，ms，s。我知道频率由秒表类提供，并且它是转换所必需的。

感谢

Answer 1

Stopwatch.Elapsed是TimeSpan，所以你可以做myStopwatch.Elapsed.TotalMilliseconds，myStopwatch.Elapsed.TotalSeconds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); 

输出：

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

注意是stopwatch.ElapsedMilliseconds回报long因此只能精确到毫秒，而stopwatch.Elapsed.TotalMilliseconds返回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tick来计算的。

Answer 2

据MSDN，频率会告诉你每秒滴答的数量。因此：

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; 

Answer 3

使用Elapsed属性：

stopwatch.Elapsed.TotalMilliseconds 

Answer 4

从MSDN docs：

使用Frequency和IsHighResolution字段，以确定秒表计时执行的精度和分辨率。

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); 

Answer 5

如果您从秒表中获得经过的时间，那么时间范围对象的属性可以获得秒，磨等。

TimeSpan ts = stopWatch.Elapsed; 
int seconds = ts.FromSeconds; 
int mill = ts.FromMiliseconds; 

Answer 6

Stopwatch.Frequency给你秒/秒。

所以，如果你有蜱，你可以通过分频得到秒：

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

例如，你可以这样做：

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(); 
} 

其中，我的系统上，打印：

3455650175.58075, 3455.65017558075, 3.45565017558075 

Answer 7

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; 
    } 
} 

然后你就可以得到经过纳秒/微秒就像这样：

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

对于毫秒，你可以使用秒表ElapsedMilliseconds（）方法。