05-XML遍历递归显示到TreeView上（XDocument类）

<?xml version="1.0" encoding="utf-8" ?>
<itcast>
  <itcastNet>
    <net0405>
      <student id="cz001">
        <name>张三</name>
        <age>18</age>
        <gender>Male</gender>
      </student>
      <student id="cz002">
        <name>李四</name>
        <age>19</age>
        <gender>Female</gender>
      </student>
    </net0405>
    <netHeiMa>
      <student id="hm001">
        <name>杨廉壬</name>
        <age>20</age>
        <gender>Male</gender>
      </student>
      <student id="hm002">
        <name>何圣东</name>
        <age>10</age>
        <gender>Male</gender>
      </student>
    </netHeiMa>
  </itcastNet>
</itcast>

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Xml.Linq;

namespace _04Xml遍历递归显示到TreeView上
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            XDocument xdoc = XDocument.Load("x1.xml");//1.加载x1.xml
            XElement xeRoot = xdoc.Root;//2.获取根节点
            //3.把根节点加到TreeView上。
            TreeNode treeViewRoot = treeView1.Nodes.Add(xeRoot.Name.ToString());
            LoadNodes(xeRoot, treeViewRoot);//4.递归加载
        }
        private void LoadNodes(XElement xeRoot, TreeNode treeViewRoot)
        {
            //把xeRoot下面的内容循环绑定到treeViewRoot下面
            foreach (XElement ele in xeRoot.Elements())
            {
                if (ele.Elements().Count() > 0)
                {
                    //把元素本身绑定上来
                    TreeNode node = treeViewRoot.Nodes.Add(ele.Name.ToString());
                    XAttribute attr = ele.Attribute("id");//如果元素还有属性的话，把属性也绑定上来。
                    if (attr != null)//表示有id属性
                    {
                        node.Text += "[" + attr.Name + "=" + attr.Value + "]";
                    }
                    LoadNodes(ele, node);
                }
                else
                {
                    TreeNode node = treeViewRoot.Nodes.Add(ele.Value);
                }
            }
        }
    }
}