What is the equivalent to System.nanoTime() in .NET?

c# java .net nanotime

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Solution 1

I think that the Stopwatch class is what you are looking for.

Solution 2

If you want a timestamp to be compared between different processes, different languages (Java, C, C#), under GNU/Linux and Windows (Seven at least):

Java:

java.lang.System.nanoTime();

C GNU/Linux:

static int64_t hpms_nano() {
   struct timespec t;
   clock_gettime( CLOCK_MONOTONIC, &t );
   int64_t nano = t.tv_sec;
   nano *= 1000;
   nano *= 1000;
   nano *= 1000;
   nano += t.tv_nsec;
   return nano;
}

C Windows:

static int64_t hpms_nano() {
   static LARGE_INTEGER ticksPerSecond;
   if( ticksPerSecond.QuadPart == 0 ) {
      QueryPerformanceFrequency( &ticksPerSecond );
   }
   LARGE_INTEGER ticks;
   QueryPerformanceCounter( &ticks );
   uint64_t nano = ( 1000*1000*10UL * ticks.QuadPart ) / ticksPerSecond.QuadPart;
   nano *= 100UL;
   return nano;
}

C#:

private static long nanoTime() {
   long nano = 10000L * Stopwatch.GetTimestamp();
   nano /= TimeSpan.TicksPerMillisecond;
   nano *= 100L;
   return nano;
}

Solution 3

the closest thing that i could find is the DateTime.ToFileTime() method. you can call this on an instance of a DateTime like so:

long starttime = DateTime.Now.ToFileTime()

The method returns a Windows File Time:

A Windows file time is a 64-bit value that represents the number of 100-nanosecond intervals that have elapsed since 12:00 midnight, January 1, 1601 A.D. (C.E.) Coordinated Universal Time (UTC).

you could at least time down to 100 ns intervals with it.

src: http://msdn.microsoft.com/en-us/library/system.datetime.tofiletime.aspx

Solution 4

DateTime.Now.Ticks

I was trying to find the answer to this to run some performance testing.

DateTime startTime = DateTime.Now;
generatorEntity.PopulateValueList();
TimeSpan elapsedTime = DateTime.Now - startTime;
Console.WriteLine("Completed! time(ticks) - " + elapsedTime.Ticks);

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