我有一个TreeView,其中包含由HierarchicalDataTemplate填充的项目.我试图从HierarchicalDataTemplate内部获取TreeView的DataContext中的属性.有人可以帮忙吗?这是我在HierarchicalDataTemplate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>
最佳答案 您可以使用TextBlock的Tag来引用TreeView的DataContext,然后您可以通过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>