小编Nor*_*ick的帖子

当用户点击按钮时,我想停止在main()中启动的调度程序.

    private void button_start_Click(object sender, RoutedEventArgs e)
    {
        ...
            Camera.EventFrame -= onFrameEventFocusCam;  //unsubscribe event

            while (!Dispatcher.HasShutdownStarted)
            {
                // test if Dispatcher started shutdown  --> ok, it does but never finishs...!
            }
        ...
    }        


    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();

        }));
        GC.Collect();
    }

当我运行此代码时,我在以下位置停止时收到以下错误消息onFrameEventFocusCam …

我有以下xml:

<Assembly>
  <Bench>
    <Typ>P1</Typ>
    <DUT>
       <A>6</A>
     </DUT>
  </Bench>
  <Bench>
    <Typ>P2</Typ>
     <DUT>
       <A>6</A>
     </DUT>
  </Bench>
</Assembly>

如何获得可以插入新DUT的'P2'元素的引用？我尝试了以下代码,这给了我一个错误:

var xElement = xmlDoc.Element("Assembly")
                                .Elements("Bench")
                                .Where(item => item.Attribute("Typ").Value == "P2")
                                .FirstOrDefault();

xElement.AddAfterSelf(new XElement("DUT")); 

提前致谢