Wpf 从HierachicalDataTemplate绑定到TreeView的DataContext

我有一个树视图，其中包含由HierarchycalDataTemplate填充的项。我试图从HierarchycalDataTemplate内部访问TreeView的DataContext中的属性。有人能帮忙吗？以下是我在HierarchycalDataTemplate中尝试的内容：

<HierarchicalDataTemplate x:Key="MyTopLevel"
                                  ItemTemplate="{StaticResource LowerLevelTemplate}"
                                  ItemsSource="{Binding LowerLevel}">
    <TextBlock Text="{Binding Name, Mode=OneWay}" ToolTip="{Binding Name, Mode=OneWay}">
       <TextBlock.ContextMenu>
            <ContextMenu x:Name="MyContextMenu">    
                <MenuItem Header="{Binding DataContext.Test, RelativeSource={RelativeSource AncestorType={x:Type TreeView}}}" />
            </ContextMenu>
        </TextBlock.ContextMenu>
    </TextBlock>
</HierarchicalDataTemplate>

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您可以使用TextBlock的标记引用TreeView的DataContext，然后通过

PlacementTarget

使用相对源绑定在ContextMenu中获取它，例如：

<TextBlock Text="{Binding Name, Mode=OneWay}" Tag="{Binding DataContext, RelativeSource={RelativeSource AncestorType=TreeView}}">
    <TextBlock.ContextMenu>
        <ContextMenu DataContext="{Binding PlacementTarget.Tag, RelativeSource={RelativeSource Self}}">
            <MenuItem Header="{Binding Test}"/>
        </ContextMenu>
    </TextBlock.ContextMenu>
</TextBlock>

如果要保留上下文菜单的原始DataContext，可以使用完整路径绑定直接导航到属性，例如：

<TextBlock Text="{Binding Name, Mode=OneWay}" Tag="{Binding DataContext, RelativeSource={RelativeSource AncestorType=TreeView}}">
    <TextBlock.ContextMenu>
        <ContextMenu>
            <MenuItem Header="{Binding PlacementTarget.Tag.Test, RelativeSource={RelativeSource AncestorType=ContextMenu}}"/>
        </ContextMenu>
    </TextBlock.ContextMenu>
</TextBlock>