C# 程序运行耗时测试类

主要用于精确测试一段代码的运行耗时时间。这里以秒为单位（包括小数点）。。

 

代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace StackallocArrayDemo
{
    public class TimerTest
    {
        [System.Runtime.InteropServices.DllImport("Kernel32.dll")]
        static extern bool QueryPerformanceCounter(ref long count);

        [System.Runtime.InteropServices.DllImport("Kernel32.dll")]
        static extern bool QueryPerformanceFrequency(ref long count);

        long count = 0;
        long count1 = 0;
        long freq = 0;
        double result = 0;

        /// <summary>
        /// 开始计时
        /// </summary>
        public void Start()
        {
            QueryPerformanceFrequency(ref freq);
            QueryPerformanceCounter(ref count);
        }

        /// <summary>
        /// 结束计时并返回耗时（秒，如 ： 0.0001 秒）
        /// </summary>
        /// <returns></returns>
        public double End()
        {
            QueryPerformanceCounter(ref count1);
            count = count1 - count;
            result = (double)(count) / (double)freq;
            return result;
        }
    }
}

 

用法：

            TimerTest test1 = new TimerTest();
            test1.Start();
                //这里是需要测试耗时的代码段
            double result = test1.End();

    

参考：http://www.wxzzz.com/?id=109