Timer.cs :  » Persistence-Frameworks » iBATIS.NET » IBatisNet » Common » Test » NUnit » CommonTests » Utilities » C# / CSharp Open Source

using System;
using System.ComponentModel;
using System.Runtime.InteropServices;
using System.Threading;

namespace IBatisNet.Common.Test.NUnit.CommonTests.Utilities{
    public class Timer
    {
            [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;

      public Timer()
      {
        startTime = 0;
        stopTime = 0;

        if (QueryPerformanceFrequency(out freq) == false)
        {
          throw new Win32Exception();
        }
      }

      public void Start()
      {
        Thread.Sleep(0);
        QueryPerformanceCounter(out startTime);
      }

      public void Stop()
      {
        QueryPerformanceCounter(out stopTime);
      }

      public double Duration
      {
        get { return (double) (stopTime - startTime)/(double) freq; }
      }
    }
}