如何将秒表刻度转换为纳秒,毫秒和秒?
这是一个非常基本的问题...很尴尬,但这里有:如何将秒表刻度转换为纳秒,毫秒和秒?
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
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。
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;
1)'sw.ElapsedTicks'返回'long' 2)将刻度滴定为'double或decimal',然后除以频率 – Timeless 2017-11-24 05:56:54
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);
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;
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
因此1ns对应于1000000000s。这看起来不正确。 :) – 2010-02-24 20:23:30
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。
尽管OP请求的纳秒数不会超过...... – 2010-02-24 20:18:00
用ns更新。 – RedFilter 2010-02-24 20:19:17
虽然这是非常不准确的,因为它会提供NS舍入到最近的MS。 – 2010-02-24 20:19:44