C# winform中自定义精确定时器(经测试稳定可靠)

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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, , ); // 间隔性地运行 if (this.timerID == )
{
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;
} }
}