c# - 匹配委托(delegate) 'System.Timers.ElapsedEventHandler' 没有重载

Question

我正在阅读这篇文章:http://www.c-sharpcorner.com/UploadFile/naresh.avari/develop-and-install-a-windows-service-in-C-Sharp/因此，由于缺乏知识，我在使用 Windows 服务时遇到了一个小问题。在这部分代码中:

 protected override void OnStart(string[] args)
    {
        timer1 = new Timer();
        this.timer1.Interval = 10800; 
        this.timer1.Elapsed += new System.Timers.ElapsedEventHandler(this.timer1_Tick);
        timer1.Enabled = true;
    }

    private void timer1_Tick()
    {
       //some code here
    }

    protected override void OnStop()
    {
        timer1.Enabled = false;
      //some code here

    }

this.timer1.Elapsed += new System.Timers.ElapsedEventHandler(this.timer1_Tick);给出:

Error 1 No overload for 'timer1_Tick' matches delegate 'System.Timers.ElapsedEventHandler'

我想知道为什么很多人对这个例子没有异议？

Answer 1

事件就是多播委托(delegate)。并且您的方法签名与委托(delegate)签名不匹配，在您的情况下是 ElapsedEventHandler 委托(delegate)。

你必须改变你的代码:

 protected override void OnStart(string[] args)
{
    timer1 = new Timer();
    this.timer1.Interval = 10800; 
    this.timer1.Elapsed += new System.Timers.ElapsedEventHandler(this.timer1_Tick);
    timer1.Enabled = true;
}

private void timer1_Tick(object sender, ElapsedEventArgs elapsedEventArg)
{
   //some code here
}

protected override void OnStop()
{
    timer1.Enabled = false;
  //some code here

}

你也可以代替:

this.timer1.Elapsed += new System.Timers.ElapsedEventHandler(this.timer1_Tick);

这样做:

timer.Elapsed += this.timer1_Tick;