Binding HierarchycalDataTemplate中的绑定FocusedElement

我试图在HierarchycalDataTemplate中聚焦控件。不幸的是，我尝试绑定到模板中的控件失败。这是我的密码：

        <HierarchicalDataTemplate DataType="{x:Type TreeView_Experiment:BookmarkPage}">
            <DockPanel>
                <ToggleButton ... edited for brevity ... />
                <Controls:EditableTextBlock x:Name="EditBox" Text="{Binding Path=Title}" VerticalAlignment="Center" IsEditable="True" Focusable="True"/>
            </DockPanel>
            <HierarchicalDataTemplate.Triggers>
                <DataTrigger Binding="{Binding Path=IsFocused, RelativeSource={RelativeSource AncestorType={x:Type TreeViewItem}}}" Value="true">
                    <!-- The Value binding fails with the error: Cannot find source for binding with reference 'ElementName=EditBox -->
                    <Setter Property="FocusManager.FocusedElement" Value="{Binding ElementName=EditBox}"/>
                </DataTrigger>
            </HierarchicalDataTemplate.Triggers>
        </HierarchicalDataTemplate>

当treeview项获得焦点，但{Binding ElementName=EditBox}失败并显示消息“找不到引用为'ElementName=EditBox，…'绑定的源”时，触发

如何修复此绑定？还是有更好的方法在HierarchycalDataTemplate中设置控件的焦点

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提前感谢您的帮助。

我可以通过在后面添加这段难看的代码来实现这一点。将此附加到树视图的onselection更改：

    private void SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
    {
        var treeView = sender as TreeView;

        var selectedContainer =
            typeof (TreeView).GetProperty("SelectedContainer", BindingFlags.NonPublic | BindingFlags.Instance).
                GetValue(treeView, null) as TreeViewItem;

        // Find the element we want to focus.
        var focusControl = selectedContainer.FindVisualChild<TextBox>();
        if (focusControl != null)
            focusControl.Focus();
    }

private void SelectedItemChanged（对象发送方，RoutedPropertyChangedEventArgs e）
{
var treeView=发送方作为treeView；
变量选择容器=
typeof（TreeView）.GetProperty（“SelectedContainer”，BindingFlags.NonPublic | BindingFlags.Instance）。
GetValue（treeView，null）作为treeView项；
//找到我们想要关注的元素。
var focusControl=selectedContainer.FindVisualChild（）；
如果（焦点控制！=null）
focusControl.Focus（）；
}

需要以下扩展方法：

    public static T FindVisualChild<T>(this DependencyObject obj) where T : DependencyObject
    {
        var childCount = VisualTreeHelper.GetChildrenCount(obj);
        for (int i = 0; i < childCount; i++)
        {
            DependencyObject child = VisualTreeHelper.GetChild(obj, i);
            if (child != null && child is T)
            {
                return (T)child;
            }

            T childOfChild = FindVisualChild<T>(child);
            if (childOfChild != null)
            {
                return childOfChild;
            }
        }
        return null;
    }

public static T FindVisualChild（此DependencyObject对象），其中T:DependencyObject
{
var childCount=visualtreeheloper.GetChildrenCount（obj）；
for（int i=0；i

与其查看树状视图并试图找到要聚焦的项目，不如让树状视图本身进行聚焦