我想建立一个程序，一旦按钮被点击，每5第二个将执行的功能（OnTimed）。

下面是code到目前为止：

 私人无效bntCapture_Click（对象发件人，RoutedEventArgs E）
{
    DispatcherTimer T1 =新DispatcherTimer（）;
    t1.Interval = TimeSpan.FromMilliseconds（5000）;
    t1.IsEnabled = TRUE;
    t1.Tick + =新的EventHandler（OnTimed）;
    t1.Start（）;
}

无效OnTimed（对象发件人，ElapsedEventArgs E）
{

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

当我运行code，它显示错误：

不超载的'方法'匹配委托System.EventHandler

事件处理程序方法的签名是不符合委托类型兼容。

Subsribers的DispatcherTimer.Tick事件必须是EventHandler委托类型，其声明为：

 公共委托无效事件处理程序（对象发件人，EventArgs e）条;
 

试试这个来代替：

 无效OnTimed（对象发件人，EventArgs的）
{
   ...
}
 

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

Below is the code so far:

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);
} 

When i run the code, it show the error:

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

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

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);

Try this instead:

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