public static class QueryPerformanceMethd

    {

        [DllImport("kernel32.dll")]

      public  extern static short QueryPerformanceCounter(ref long x);

        [DllImport("kernel32.dll")]

        public extern static short QueryPerformanceFrequency(ref long x);

    }

    static void Main(string[] args)

        {

            long stop_Value = 0;

            long start_Value = 0;

            long freq = 0;

            QueryPerformanceMethd.QueryPerformanceFrequency(ref freq);

            QueryPerformanceMethd.QueryPerformanceCounter(ref start_Value);

            //Fun()    需要计时方法

            QueryPerformanceMethd.QueryPerformanceCounter(ref stop_Value);

            double time = (double)(stop_Value - start_Value) / (double)(freq);

            Console.WriteLine(time);//单位S

            Console.ReadLine();

        }    

#include "stdafx.h"

#include "windows.h"

void main()

{

    LARGE_INTEGER nFreq;

    LARGE_INTEGER nBeginTime;

    LARGE_INTEGER nEndTime;

    double time;

    QueryPerformanceFrequency(&nFreq);

    QueryPerformanceCounter(&nBeginTime);

    Sleep();

    QueryPerformanceCounter(&nEndTime);

    time = (double)(nEndTime.QuadPart - nBeginTime.QuadPart) / (double)nFreq.QuadPart;

    printf("%f\n", time);

    system("Pause");

}