如何关闭事件处理程序

Question

我确实有以下情况(WPF;c#):

1)我初始化一个相机，并启动一个事件处理程序，在后台自动显示实时图像

2)之后，如果例如用户单击按钮，我想再次关闭这个打开的事件处理程序。问题:我怎么才能做到呢?

我代码:

private void InitCamera(int CamID)
{
    ...
    Camera.EventFrame += onFrameEventFocusCam;    // start event
    ...
}

private void onFrameEventFocusCam(object sender, EventArgs e)
{
 ...
    Dispatcher.Invoke(new Action(() =>
    {
        // Convert bitmap to WPF-Image
        var bmp = new Bitmap(bitmap);
        var hBitmap = bmp.GetHbitmap();
        System.Windows.Media.ImageSource wpfBitmap = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
        hBitmap, IntPtr.Zero, Int32Rect.Empty, BitmapSizeOptions.FromEmptyOptions());
        image_fokus.Source = wpfBitmap;
        image_fokus.Stretch = System.Windows.Media.Stretch.UniformToFill;

        DeleteObject(hBitmap);
        bitmap.Dispose();
    }
...
}

Answer 1

你试过了吗:

Camera.EventFrame -= onFrameEventFocusCam;