High-Performance Timer in C#

最新推荐文章于 2022-02-15 09:14:38 发布

joyhen

最新推荐文章于 2022-02-15 09:14:38 发布

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分类专栏： C# 文章标签： Stopwatch Kernel32.dll QueryPerformanceCoun HiPerfTimer

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本文介绍了一个基于 C# 的高性能计时器类的实现方法，该计时器利用了 Kernel32.dll 中的 QueryPerformanceCounter 和 QueryPerformanceFrequency 函数来获取更精确的时间间隔。

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继上一篇 http://blog.youkuaiyun.com/Joyhen/article/details/17222273

原文：http://www.codeproject.com/Articles/2635/High-Performance-Timer-in-C

上码：

namespace ConsoleApplication1
{
    using System;
    using System.Runtime.InteropServices;
    using System.ComponentModel;
    using System.Threading;

    internal class HiPerfTimer
    {
        const string dll = "Kernel32.dll";

        [DllImport(dll)]
        private static extern bool QueryPerformanceCounter(out long lpPerformanceCount);

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

        private long startTime, stopTime;
        private long freq;

        // Constructor
        public HiPerfTimer()
        {
            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;
            }
        }
    }
}

使用：

static void Main(string[] args)
        {
            HiPerfTimer pt = new HiPerfTimer();
            pt.Start();

            var items = Guid.NewGuid();
            Console.WriteLine(items.ToString());

            pt.Stop();

            Console.WriteLine("Duration: {0} sec\n", pt.Duration);

            Console.ReadKey();
        }