Windows API高精度计时 C#版

// program.cs

// PerfTimer 及 测试程序

 TestPerformance
{
    internal sealed class PerfTimer
    {
        [DllImport("Kernel32.dll")]
        private static extern bool QueryPerformanceCounter(
            out long lpPerformanceCount);

        [DllImport("Kernel32.dll")]
        private static extern bool QueryPerformanceFrequency(
            out long lpFrequency);

        private long startTime, stopTime;
        private long freq;

        // Constructor
        public PerfTimer()
        {
            startTime = 0;
            stopTime = 0;

            if (QueryPerformanceFrequency(out freq) == false)
            {
                // high-performance counter not supported
                throw new Win32Exception();
            }
        }

        // Start the timer
        public void Start()
        {
            // lets do the waiting threads there work
            Thread.Sleep(0);
            QueryPerformanceCounter(out startTime);
        }

        // Stop the timer
        public void Stop()
        {
            QueryPerformanceCounter(out stopTime);
        }

        // Returns the duration of the timer (in seconds)
        public double Duration
        {
            get
            {
                return (double)(stopTime - startTime) / (double)freq;
            }
        }
    }
 

    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Press any key to continue");
            Console.ReadKey();

            PerfTimer pt = new PerfTimer();     // create a new PerfTimer object
            pt.Start();                             // start the timer

            for(int i=0; i<10000; i++)
            {
                string s = string.Format("This is test round {0}", i);//"This is test round "+i.ToString();
                Console.WriteLine(s);
            }

            pt.Stop();
            Console.WriteLine("Duration: {0} second(s)"n", pt.Duration); // print the duration of the timed code

            Console.WriteLine("Press any key to continue");
            Console.ReadKey();
        }
    }

}

 参考文献：

【1】http://www.codeproject.com/KB/cs/highperformancetimercshar.aspx