C# winform中自定义精确定时器(经测试稳定可靠)

原C#的定时器时间越长，误差越大。

在主动请求设备数据的使用，使用C#的几种自带定时器导致每天都会丢失几条数据。

经测试使用自定义的定时器可完全解决此问题。

使用方法:

MillisecondTimer _sysTimer;

_sysTimer = new MillisecondTimer();
_sysTimer.Tick += sysTimer_Tick; ;
_sysTimer.Interval = 1000; //每秒执行
_sysTimer.Start();

private void sysTimer_Tick(object sender, EventArgs e)
{

//需要定时执行的内容

}

自定义类（MillisecondTimer.cs）如下：

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

namespace TEST
{
public sealed class MillisecondTimer : IComponent, IDisposable
    {

private static TimerCaps caps;
private int interval;
private bool isRunning;
private int resolution;
private TimerCallback timerCallback;
private int timerID;

public int Interval
        {
get
            {
return this.interval;
            }
set
            {
if ((value < caps.periodMin) || (value > caps.periodMax))
                {
throw new Exception("超出计时范围！");
                }
this.interval = value;
            }
        }

/// <summary>
/// 
/// </summary>
public bool IsRunning
        {
get
            {
return this.isRunning;
            }
        }

/// <summary>
/// 
/// </summary>
public ISite Site
        {
set;
get;
        }

public event EventHandler Disposed;  // 这个事件实现了IComponet接口
public event EventHandler Tick;

static MillisecondTimer()
        {
            timeGetDevCaps(ref caps, Marshal.SizeOf(caps));
        }

public MillisecondTimer()
        {
this.interval = caps.periodMin;    // 
this.resolution = caps.periodMin;  //

this.isRunning = false;
this.timerCallback = new TimerCallback(this.TimerEventCallback);

        }

public MillisecondTimer(IContainer container)
            : this()
        {
            container.Add(this);
        }

~MillisecondTimer()
        {
            timeKillEvent(this.timerID);
        }

public void Start()
        {
if (!this.isRunning)
            {
this.timerID = timeSetEvent(this.interval, this.resolution, this.timerCallback, 0, 1); // 间隔性地运行

if (this.timerID == 0)
                {
throw new Exception("无法启动计时器");
                }
this.isRunning = true;
            }
        }

public void Stop()
        {
if (this.isRunning)
            {
                timeKillEvent(this.timerID);
this.isRunning = false;
            }
        }

/// <summary>
/// 实现IDisposable接口
/// </summary>
public void Dispose()
        {
            timeKillEvent(this.timerID);
            GC.SuppressFinalize(this);
            EventHandler disposed = this.Disposed;
if (disposed != null)
            {
                disposed(this, EventArgs.Empty);
            }
        }


//***************************************************  内部函数  ******************************************************************
        [DllImport("winmm.dll")]
private static extern int timeSetEvent(int delay, int resolution, TimerCallback callback, int user, int mode);


        [DllImport("winmm.dll")]
private static extern int timeKillEvent(int id);


        [DllImport("winmm.dll")]
private static extern int timeGetDevCaps(ref TimerCaps caps, int sizeOfTimerCaps);
//  The timeGetDevCaps function queries the timer device to determine its resolution. 



private void TimerEventCallback(int id, int msg, int user, int param1, int param2)
        {
if (this.Tick != null)
            {
this.Tick(this, null);  // 引发事件
            }
        }


//***************************************************  内部类型  ******************************************************************

private delegate void TimerCallback(int id, int msg, int user, int param1, int param2); // timeSetEvent所对应的回调函数的签名


/// <summary>
/// 定时器的分辨率（resolution）。单位是ms，毫秒
/// </summary>
        [StructLayout(LayoutKind.Sequential)]
private struct TimerCaps
        {
public int periodMin;
public int periodMax;
        }

    }
}