Masuit.Tools/Masuit.Tools.Abstractions/Systems/HiPerfTimer.cs

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

namespace Masuit.Tools.Systems
{
    /// <summary>
    /// 纳秒级计时器，仅支持Windows系统
    /// </summary>
    public class HiPerfTimer
    {
        [DllImport("Kernel32.dll")]
        private static extern bool QueryPerformanceCounter(out long lpPerformanceCount);

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

        private long _startTime;
        private long _stopTime;
        private readonly long _exFreq;

        /// <summary>
        /// 纳秒计数器
        /// </summary>
        public HiPerfTimer()
        {
            _startTime = 0;
            _stopTime = 0;
            if (QueryPerformanceFrequency(out _exFreq) == false)
            {
                throw new Win32Exception("不支持高性能计数器");
            }
        }

        /// <summary>
        /// 开始计时器
        /// </summary>
        public void Start()
        {
            // 让等待线程工作 
            Thread.Sleep(0);
            QueryPerformanceCounter(out _startTime);
        }

        /// <summary>
        /// 开始计时器
        /// </summary>
        public void Restart()
        {
            _startTime = 0;
            Start();
        }

        /// <summary>
        /// 停止计时器
        /// </summary>
        public double Stop()
        {
            QueryPerformanceCounter(out _stopTime);
            return Duration;
        }

        /// <summary>
        /// 启动一个新的计时器
        /// </summary>
        /// <returns></returns>
        public static HiPerfTimer StartNew()
        {
            HiPerfTimer timer = new HiPerfTimer();
            timer.Start();
            return timer;
        }

        /// <summary>
        /// 时器经过时间(单位：秒)
        /// </summary>
        public double Duration => (_stopTime - _startTime) / (double)_exFreq;
        public double DurationNanoseconds => _stopTime - _startTime;

        /// <summary>
        /// 时器经过的总时间(单位：秒)
        /// </summary>
        public double Elapsed
        {
            get
            {
                Stop();
                return Duration;
            }
        }

        /// <summary>
        /// 时器经过的总时间(单位：纳秒)
        /// </summary>
        public double ElapsedNanoseconds
        {
            get
            {
                Stop();
                return DurationNanoseconds;
            }
        }

        /// <summary>
        /// 执行一个方法并测试执行时间
        /// </summary>
        /// <param name="action"></param>
        /// <returns></returns>
        public static double Execute(Action action)
        {
            var timer = new HiPerfTimer();
            timer.Start();
            action();
            timer.Stop();
            return timer.Duration;
        }
    }
}