WPF数据绑定:如何访问"父"数据上下文？

Question

我有一个窗口中包含的列表(见下文).窗口DataContext有两个属性,Items和AllowItemCommand.

如何获取针对窗口的属性需要解析Hyperlink的Command属性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>

Answer 1

你可以尝试这样的事情:

...Binding="{Binding RelativeSource={RelativeSource FindAncestor, 
AncestorType={x:Type Window}}, Path=DataContext.AllowItemCommand}" ...

Answer 2

这也有效:

<Hyperlink Command="{Binding RelativeSource={RelativeSource AncestorType=ItemsControl},
                             Path=DataContext.AllowItemCommand}" />

ListView将继承其DataContext从Window,所以它的使用在这一点上,太.
因为ListView,就像类似的控件(例如Gridview,ListBox等等)是一个子类ItemsControl,Binding对于这样的控件将完美地工作.

Answer 3

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,它工作得很好.

RelativeSource="{RelativeSource Mode=FindAncestor, AncestorType=telerik:RadGridView}"