Treeview获取父节点

private void treeView1_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs<object> e)
    {
      //节点（是子节点或者是根节点）
      TreeViewItem item = treeView1.SelectedItem as TreeViewItem;

      //获取父节点
      TreeViewItem parent = item.Parent as TreeViewItem;
      //判断父节点是否存在
      if (parent != null) {
        //显示父节点信息，这里显示 Header 信息
        MessageBox.Show("父节点的Header：" + parent.Header.ToString());
      } else {
        MessageBox.Show("没有父节点！");
      }

    }

 /// <summary>
        /// 获取父节点的完整路径
        /// </summary>
        /// <param name="TV"></param>
        /// <returns></returns>
        string GetItemFather(TreeViewItem TV)
        {
            //获取父节点
            TreeViewItem parent = TV.Parent as TreeViewItem;
            //判断父节点是否存在
            if (parent != null)
            {
                return  GetItemFather(parent)+"\\"+parent .Header .ToString ();
            }
            else
            {
                return "";
            }
        }