如何將秒錶刻度轉換爲納秒，毫秒和秒？

Question

這是一個非常基本的問題...很尷尬，但這裏有：

我有一個C＃代碼中的秒錶塊。我以滴答確定流逝的時間，然後想轉換爲ns，ms，s。我知道頻率由秒錶類提供，並且它是轉換所必需的。

感謝

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); 

輸出：

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

注意是stopwatch.ElapsedMilliseconds回報long因此只能精確到毫秒，而stopwatch.Elapsed.TotalMilliseconds返回double和具有相同的精度爲stopwatch.ElapsedTicks，但它更容易使用。 ILSpy顯示TimeSpan.TotalMilliseconds無論如何都是使用tick來計算的。

Answer 2

據MSDN，頻率會告訴你每秒滴答的數量。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屬性：

stopwatch.Elapsed.TotalMilliseconds 

Answer 4

從MSDN docs：

使用Frequency和IsHighResolution字段，以確定秒錶計時執行的精度和分辨率。

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

如果您從秒錶中獲得經過的時間，那麼時間範圍對象的屬性可以獲得秒，磨等。

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

Answer 6

Stopwatch.Frequency給你秒/秒。

所以，如果你有蜱，你可以通過分頻得到秒：

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

例如，你可以這樣做：

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，我的系統上，打印：

3455650175.58075, 3455.65017558075, 3.45565017558075 

Answer 7

使用這個類：

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; 
    } 
} 

然後你就可以得到經過納秒/微秒就像這樣：

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

對於毫秒，你可以使用秒錶ElapsedMilliseconds（）方法。