如何在设计时制作支持拖放的自定义WPF ContentControl? [英] How to make custom WPF ContentControl that supports drag-and-drop at design time?

问题描述

我想创建一个自定义的 WPF 控件，里面有一个子"控件.子类化 ContentControl 或 UserControl 有效，但有一个缺陷:这些控件在设计器模式下不起作用.

I want to create custom WPF control that has a single "child" control inside. Subclassing ContentControl or UserControl works, but has one flaw: these controls don't work in designer mode.

不工作"是指这种情况:假设我有一个带有自定义控件的 Canvas.我想在我的控件中放置一个 Button .我将它从工具箱中拖出，它出现在我的控件中.但是，XAML 视图显示新按钮实际上属于 Canvas，而不是我的控件.

By "don't work" I mean this scenario: suppose I have a Canvas with my custom control in it. I want to put, say, a Button inside my control. I drag it from the toolbox, and it appears inside my control. However, XAML view shows that the new button actually belongs to Canvas, not to my control.

我可以通过手动编辑 XAML 将其放置在我的控件中，但我希望设计器也能工作.

I can place it inside my control by manually editing XAML, but I want the designer to work too.

有趣的是，当我子类化 Canvas、Grid 或 Panel 时，设计器按预期工作.但是，这些控件有很多 个子控件，这不是我需要的.

Interestingly, when I subclass Canvas, Grid or Panel, designer works as expected. However, these controls have many children, which is not what I need.

如何制作在设计器中有效的单子控件?

How can I make a single-child control that works in designer?

推荐答案

继承 Border 怎么样?这样你就可以免去设计器可扩展性的麻烦

how about inheriting from Border? that way you could spare yourself the hassle with Designer Extensibility

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