XAML 数据绑定到另一个类

Question

将 TreeView 中 ChildButton 的标记属性绑定Tag="{Binding ParentData}"到类 TreeParent 的 ParentData 属性的最佳方法是什么？<TreeView>  <TreeView.Resources>    <HierarchicalDataTemplate DataType="{x:Type local:TreeParent}" ItemsSource="{Binding Members}">        <Button x:Name="ParentButton" Text="{Binding ParentName}">        </Button>    </HierarchicalDataTemplate>    <DataTemplate DataType="{x:Type local:TreeChild}" ItemsSource="{Binding Members}">        <Button x:Name="ChildButton" Text="{Binding ChildName}" Tag="{Binding ParentData}">        </Button>    </DataTemplate>  </TreeView.Resources></TreeView>xaml 文件后面的 .cs 代码如下所示：public class TreeParent{   public string ParentName { get; set; }   public SomeDataClass ParentData { get; set; }   public ObservableCollection<TreeChild> Members { get; set; }}public class TreeChild{   public string ChildName { get; set; }}

Answer 1

尝试这个：

<Button x:Name="ChildButton" ... 
        Tag="{Binding DataContext.ParentData, 
             RelativeSource={RelativeSource AncestorType=TreeViewItem, AncestorLevel=2}}" />