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 "";

            }

        }