具有多个子级的WPF UserControl [英] WPF UserControl with multiple Children

问题描述

我有一个UserControl，我希望能够有多个孩子。

I have a UserControl that I would like to be able to have more than one child. It already has StackPanel as it's child, so what am I doing wrong?

最终，我希望控件自动包含其自己的一些子项，然后，使用时，允许在其元素之一内放置更多孩子。我尝试 MSDN的如何覆盖逻辑树，但没有成功。

Ultimately, I'd like for the control to include some of its own children automatically and then, when it's used, allow placing more children inside one of its elements. I tried MSDN's How to Override the Logical Tree without success.

谢谢。

LayerPanelItem.xaml：

LayerPanelItem.xaml:

<UserControl x:Class="Controls.LayerPanelItem"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
 <StackPanel></StackPanel>
</UserControl>

Main.xaml：

Main.xaml:

<controls:LayerPanelItem>   
    <TextBlock>Test</TextBlock>
    <TextBlock>Test</TextBlock> <!-- Error:  The property 'Content' is set more than once. -->
</controls:LayerPanelItem>

推荐答案

您不能（直接）使用UserControl。相反，您需要从 ItemsControl ，并将您自己的自定义布局逻辑放在子类中。

You can't do this (directly) with a UserControl. Instead, you'll need to derive from ItemsControl, and put your own custom layout logic in the subclass.

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