自定义控件的内容不能绑定到控件的父级 [英] Custom control's content can't bind to parent of the control

问题描述

我有以下XAML（简化的，没有结尾的标签）：

I have following XAML (simplified, no ending tags):

<Window Name="myWindow" DataContext="{Binding ElementName=myWindow}" >
    <DockPanel>
        <tb:ToolBar Name="toolbar" DockPanel.Dock="Top">
            <tb:ToolBar.Items>
                <tb:ToolBarControl Priority="-3">
                    <tb:ToolBarControl.Content>
                        <StackPanel Orientation="Horizontal">
                            <TextBlock>Maps:</TextBlock>
                            <ComboBox ItemsSource="{Binding Generator.Maps, ElementName=myWindow}">

但是， ComboBox 的绑定将失败with

But the ComboBox's binding will fail with

找不到与
绑定的源引用'ElementName = myWindow'

Cannot find source for binding with reference 'ElementName=myWindow'

有关自定义控件的一些事实：

Some facts about the custom controls:

• tb：ToolBar 是 UserControl ，其中包含实际的 ToolBar 与 ItemsSource 绑定到项目属性 tb：ToolBar （继承 IList ）。

• tb:ToolBar is UserControl which contains actual ToolBar with ItemsSource bound to the Items property of the tb:ToolBar (of type inheriting IList).

工具栏的 ToolBarItem DataTemplate 从几个 DataTemplate 中选择（根据类型

The ToolBar's ToolBarItem DataTemplate is chosen from several DataTemplates (according to the type of the item).

属于 tb：ToolBarControl 的DataTemplate非常简单 - 它只是包含 ContentPresenter 绑定到的属性内容 tb：ToolBarControl

The DataTemplate belonging to the tb:ToolBarControl is very simple - it just contains ContentPresenter bound to property Content of the tb:ToolBarControl.

t b：ToolBarControl 不是出于技术原因 UserControl ，它只是 DependencyObject 与属性内容类型为对象。

tb:ToolBarControl is not for technical reasons UserControl, it is just DependencyObject with property Content of type object.

为什么 ComboBox 不能引用窗口？

感谢任何帮助！

推荐答案

这里有一个类似的问题：

I had a similar problem here:

WPF绑定关于用户控件的子依赖对象不工作

DependencyObject没有DataContext，我认为这就是绑定不起作用的原因。而不是继承'DependencyObject'，尝试从FrameworkElement继承。

DependencyObject doesn't have a DataContext and I think that's why the binding doesn't work. Instead of inheriting from 'DependencyObject' try inheriting from FrameworkElement.

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