如何获得UIElement的父级? [英] How can you get the parent of a UIElement?

问题描述

好吧，我知道FrameworkElement是UIElement的直接子类，它具有Parent属性，但是Panel的子类型为UIElement而不是FrameworkElement(子类型为UIElementCollection)这似乎意味着您可以将UIElement直接添加到面板中.

Ok, I know that FrameworkElement, which is a direct subclass of UIElement, has a Parent property, but Panels have children of type UIElement, not FrameworkElement (Children is of type UIElementCollection) which seems it would mean you can add UIElements directly to a Panel.

也就是说，如果您有一个UIElement并想查看它是否具有作为面板的父级，那么我知道如何测试它的唯一方法是使用VisualTreeHelper，但这是可视化树，而不是逻辑树. (至少我们知道面板没有模板，所以也许是这样，但是仍然...)

That said, if you have a UIElement and want to see if it has a parent that's a panel, the only way I know how to test this is with the VisualTreeHelper, but that's the visual tree, not the logical tree. (At least we know a Panel doesn't have a template so maybe that's the way, but still...)

那么从VisualTreeHelper出发，有人知道如何知道UIElement的父面板吗? (...还有什么想法为什么他们不只是在此处而不是在FrameworkElement上定义Parent属性?)

So asides from the VisualTreeHelper, does anyone know how to know which panel is the parent of a UIElement? (...and have any thoughts why they didn't just define a Parent property there instead of on FrameworkElement?)

谢谢！

推荐答案

好吧，如果您需要查找逻辑父对象，则可以像VisualTreeHelper一样使用LogicalTreeHelper.

Well, if you need to find a logical parent you can just use LogicalTreeHelper in the same manner as VisualTreeHelper.

至于"...还有什么想法，为什么他们不只是在FrameworkElement上而不是在此处定义Parent属性?".基本上，在FrameworkElement级别上引入了逻辑树"的概念.请参阅 http://msdn.microsoft.com/en-us/library/system.windows.frameworkelement.aspx (请参见备注")，以获取FrameworkElement添加到UIElement的详细信息.这是有关逻辑树的内容:

As for "...and have any thoughts why they didn't just define a Parent property there instead of on FrameworkElement?". Basically, the notion of "Logical Tree" is introduced on the FrameworkElement level. See http://msdn.microsoft.com/en-us/library/system.windows.frameworkelement.aspx (see Remarks) for details of what FrameworkElement adds to UIElement. Here is what it says about Logical Trees:

逻辑树:常规WPF 编程模型经常被表达 就成为一棵元素树而言. 支持表达树 元素作为逻辑树，以及 伴随着对定义的支持 标记中的树是在 FrameworkElement级别.但是请注意 该FrameworkElement故意 没有定义内容模型，并且 将责任推卸给 类.有关更多信息，请参见 WPF中的树.

The logical tree: The general WPF programming model is often expressed in terms of being a tree of elements. Support for expressing the tree of elements as a logical tree, and accompanying support for defining that tree in markup is implemented at the FrameworkElement level. Note however that FrameworkElement deliberately does not define a content model, and leaves that responsibility to derived classes. For more information, see Trees in WPF.

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