c# - 'method' 没有重载匹配委托(delegate) 'System.EventHandler'

Question

我正在尝试构建一个程序，单击按钮后，每 5 秒将执行一次该功能 (OnTimed)。

下面是目前的代码:

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:

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

Answer 1

事件处理方法的签名与委托(delegate)类型不兼容。

DispatcherTimer.Tick 的订阅者事件必须属于 EventHandler委托(delegate)类型，声明为:

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

试试这个:

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