问题:“指定的元素已经是另一个元素的逻辑子元素.首先断开连接." [英] Issue: "Specified element is already the logical child of another element. Disconnect it first."

问题描述

注意:我已经在6月和7月的CTP位中进行了尝试.

Note: I have tried this with both the June and July CTP bits.

背景:发生此问题，并且在两个XAML窗口之间成功进行了拖放操作.

Background: This issue occurs and the end of a succesful drag and drop operation between two XAML windows.

源是一个包含Button控件的树视图(可以是另一种控件对象，但是我认为这对这个问题无关紧要).将其拖放到第二个xaml窗口中，该窗口是Canvas.

The source is a treeview that contains a Button control (could be another kind of control object, but I don't think it matters for this issue). That is drag and dropped unto a 2nd xaml window which is a Canvas. 

我尝试了以下代码片段:

I have tried the following code fragments: 

_SelectedElement =( UIElement )e.Source;
this .RemoveLogicalChild(_SelectedElement);
DragDrop .DoDragDrop(_SelectedElement，_SelectedElement， DragDropEffects .All);

_SelectedElement = (UIElement)e.Source;
this.RemoveLogicalChild(_SelectedElement);
DragDrop.DoDragDrop(_SelectedElement, _SelectedElement, DragDropEffects.All);

-AND-

_SelectedElement =( UIElement )e.Source;
this .RemoveLogicalChild(_SelectedElement);
ContentPresenter oContentPresenter = 新 ContentPresenter ();
oContentPresenter.Content = _SelectedElement;
DragDrop .DoDragDrop(_SelectedElement，_SelectedElement， DragDropEffects .All);

_SelectedElement = (UIElement)e.Source;
this.RemoveLogicalChild(_SelectedElement);
ContentPresenter oContentPresenter = new ContentPresenter();
oContentPresenter.Content = _SelectedElement;
DragDrop.DoDragDrop(_SelectedElement, _SelectedElement, DragDropEffects.All);

此外，我还尝试包装< ControlTemplate > 周围的源"按钮控制没有运气.

Also, I have tried wrapping a <ControlTemplate> around the "Source" Button control with no luck.

欢迎提出任何建议！
谢谢您，
艾伦

Any suggestions are welcome!
Thank you,
Alan 

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