如何在父级中绑定子用户控件的数据上下文 [英] How to bind a child user control's data context in the parent

问题描述

<TextBlock Text="{Binding ChildGroupName, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type UserControl}}, UpdateSourceTrigger=PropertyChanged,NotifyOnTargetUpdated=True,Mode=TwoWay}"
TargetUpdated="OnTextUpdated"/> 

这里的 ChildGroupName 是子控件数据上下文属性.我想将 ChildGroupName 值绑定到父窗口.

Here ChildGroupName is a child control datacontext property. I want to bind ChildGroupName values to parent window.

推荐答案

您不能使用 FindAncestor 将数据绑定到后代的数据...线索就在其名称中.如果子 UserControl 在与父项相同的 XAML 中定义，则您可以为其提供名称，然后使用 Binding.ElementName 属性 将数据绑定到其属性:

You cannot use FindAncestor to data bind to a descendant's data... the clue is in its name. If the child UserControl is defined in the same XAML as the parent, then you can provide it with a name and then use the Binding.ElementName Property to data bind to its properties:

<TextBlock Text="{Binding ChildPropertyName, ElementName=NameOfChildUserControl, 
    UpdateSourceTrigger=PropertyChanged, NotifyOnTargetUpdated=True, Mode=TwoWay}" 
    TargetUpdated="OnTextUpdated" />

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