WPF 数据绑定：如何访问“父”数据上下文？
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WPF Databinding: How do I access the "parent" data context?
提问by Jordan
I have a list (see below) contained in a window. The window's DataContexthas two properties, Itemsand AllowItemCommand.
我有一个包含在窗口中的列表（见下文）。窗口DataContext有两个属性，Items和AllowItemCommand。
How do I get the binding for the Hyperlink's Commandproperty needs to resolve against the window's DataContext?
我如何获得Hyperlink'sCommand属性的绑定需要解决窗口的DataContext？
<ListView ItemsSource="{Binding Items}">
<ListView.View>
<GridView>
<GridViewColumn Header="Action">
<GridViewColumn.CellTemplate>
<DataTemplate>
<StackPanel>
<TextBlock>
<!-- this binding is not working -->
<Hyperlink Command="{Binding AllowItemCommand}"
CommandParameter="{Binding .}">
<TextBlock Text="Allow" />
</Hyperlink>
</TextBlock>
</StackPanel>
</DataTemplate>
</GridViewColumn.CellTemplate>
</GridViewColumn>
</GridView>
</ListView.View>
</ListView>
回答by flq
You could try something like this:
你可以尝试这样的事情：
...Binding="{Binding RelativeSource={RelativeSource FindAncestor,
AncestorType={x:Type Window}}, Path=DataContext.AllowItemCommand}" ...
回答by Kylo Ren
This will also work:
这也将起作用：
<Hyperlink Command="{Binding RelativeSource={RelativeSource AncestorType=ItemsControl},
Path=DataContext.AllowItemCommand}" />
ListViewwill inherit its DataContextfrom Window, so it's available at this point, too.
And since ListView, just like similar controls (e. g. Gridview, ListBox, etc.), is a subclass of ItemsControl, the Bindingfor such controls will work perfectly.
ListView将继承其DataContextfrom Window，因此此时它也可用。
由于ListView就像类似的控件（例如Gridview、ListBox等）是 的子类ItemsControl，因此Binding此类控件将完美地工作。
回答by sangers
This also works in Silverlight 5 (perhaps earlier as well but i haven't tested it). I used the relative source like this and it worked fine.
这也适用于 Silverlight 5（也许更早，但我还没有测试过）。我使用了这样的相对来源，效果很好。
RelativeSource="{RelativeSource Mode=FindAncestor, AncestorType=telerik:RadGridView}"
RelativeSource="{RelativeSource Mode=FindAncestor, AncestorType=telerik:RadGridView}"
