“方法"没有重载匹配委托“System.EventHandler" [英] No overload for 'method' matches delegate 'System.EventHandler'

问题描述

我正在尝试构建一个程序，一旦单击按钮，每 5 秒就会执行一次该功能 (OnTimed).

I am trying to build a program that, once the button was click, every 5 second will perform the function (OnTimed).

以下是目前的代码:

private void bntCapture_Click(object sender, RoutedEventArgs e)
{ 
    DispatcherTimer t1 = new DispatcherTimer();
    t1.Interval = TimeSpan.FromMilliseconds(5000);
    t1.IsEnabled = true;
    t1.Tick += new EventHandler(OnTimed);
    t1.Start();
}

void OnTimed(object sender, ElapsedEventArgs e)
{

    imgCapture.Source = imgVideo.Source;
    System.Threading.Thread.Sleep(1000);
    Helper.SaveImageCapture((BitmapSource)imgCapture.Source);
} 

当我运行代码时，它显示错误:

When i run the code, it show the error:

'method' 没有重载匹配委托'System.EventHandler'

"No overload for 'method' matches delegate 'System.EventHandler'

推荐答案

事件处理程序方法的签名与委托类型不兼容.

The signature of the event-handler method isn't compatible with the delegate type.

DispatcherTimer 的订阅者.Tick 事件必须属于 EventHandler 委托类型，声明为:

Subsribers to the DispatcherTimer.Tick event must be of the EventHandler delegate type, which is declared as:

public delegate void EventHandler(object sender, EventArgs e);

试试这个:

void OnTimed(object sender, EventArgs e)
{
   ...
}

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