XmL文件代码：

<?xml version="1.0" encoding="utf-8" ?>
<Area>
  <Province  iAreaID="1" cAreaName="北京市"/>
  <Province iAreaID="2" cAreaName="上海市"/>
  <Province iAreaID="3" cAreaName="天津市"/>
  <Province iAreaID="4" cAreaName="重庆市"/>
  <Province iAreaID="5" cAreaName="湖北省">
  <City iAreaID="51" cAreaName="武汉市"/>
  <City iAreaID="52" cAreaName="黄冈市"/>
  <City iAreaID="53" cAreaName="荆州市"/>
  <City iAreaID="54" cAreaName="武穴市"/>
  <City iAreaID="55" cAreaName="十堰市"/>
  <City iAreaID="56" cAreaName="黄石市"/>
 </Province>
  <Province iAreaID="6" cAreaName="河北省">
    <Province  iAreaID="61" cAreaName="石家庄市"/>
    <Province iAreaID="62" cAreaName="唐山市"/>
  </Province>
  <Province iAreaID="7" cAreaName="山西省">
    <Province  iAreaID="71" cAreaName="太原市"/>
    <Province iAreaID="72" cAreaName="大同市"/>
  </Province>
</Area>

aspx前代码：

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
     <asp:TreeView ID="treeAreaList" runat="server" 
     AutoGenerateDataBindings="false" OnSelectedNodeChanged="Tree_SelectedNodeChanged"></asp:TreeView>
    </div>
    </form>
</body>
</html>

CS代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Xml;

namespace WebApplication1.复合控制和模板页
{
    public partial class TreeView控件 : System.Web.UI.Page
    {
        XmlDocument xmlDoc;
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!Page.IsPostBack)
            {
                MakeParentNode();
            }
        }
            #region

         protected void MakeParentNode()
            {
             treeAreaList.Nodes.Clear();
             xmlDoc=new XmlDocument();
             xmlDoc.Load(Server.MapPath("area.xml "));//动态加载xml文档
             XmlNodeList nodeList=xmlDoc.SelectSingleNode("Area").ChildNodes;//获取子节点
             //定义Area节点
             TreeNode topNode=new TreeNode();//定义顶级节点
             topNode.Text="area";
             //tn.Value="-1";
             topNode.Expanded=true;

             treeAreaList.Nodes.Add(topNode);//添加”区域“父节点
             XmlElement element=null;
             TreeNode treeNode=null;
             //遍历区域下的所有省和直辖市
             foreach (XmlNode node in nodeList)
             {
                 element=(XmlElement)node;
                 treeNode=new TreeNode();
                 treeNode.Text=element.GetAttribute("cAreaName");
                 //在树控件上显示省或直辖市
                 treeNode.Value=element.GetAttribute("iAreaID");
                 //获取节点值
                 treeNode.Expanded=true;
                 topNode.ChildNodes.Add(treeNode);
                 MakeChildNode(node.ChildNodes,treeNode);
             }
            }
                #endregion
                #region
         protected void MakeChildNode( XmlNodeList nodeList,TreeNode treeNode)
         {
             XmlElement element = null;
             TreeNode subTreeNode = null;
             foreach (XmlNode node in nodeList)
             {
                 element = (XmlElement)node;
                 subTreeNode = new TreeNode();
                 subTreeNode.Text = element.GetAttribute("cAreaName");
                 //在树控件上显示省或直辖市
                 subTreeNode.Value = element.GetAttribute("iAreaID");
                 //获取节点值
                 subTreeNode.Expanded = true;
                 treeNode.ChildNodes.Add(subTreeNode);
                 MakeChildNode(node.ChildNodes, subTreeNode);
             }
         }
            #endregion
        protected void Tree_SelectedNodeChanged(object sender, EventArgs e)
        {

            Response.Write("节点的值：" + treeAreaList.SelectedNode.Value + "<br/>");
            Response.Write("节点的路径：" + treeAreaList.SelectedNode.ValuePath + "<br/>");
            Response.Write("节点的数据路径：" + treeAreaList.SelectedNode.DataPath + "<br/>");
        }
    }
}

显示效果：

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