TreeView控件可以使用XML文档作为数据源，根据XML文档的层次结构显示节点。而XML文档的访问由XmlDataSource控件来完成，从XmlDataSource控件的DataFile属性中指定XML文档路径，然后在TreeView控件中设置与XML文档中的节点的对应关系。本示例将演示如何把TreeView控件绑定到XML数据源。
<?xml version="1.0" encoding="utf-8" ?>
<contact name="联系人">
<genre name="华南地区">
<person Text="负责人">
<name>
张三</name>
<sex>
男</sex>
<age>
25</age>
<address>
广州市黄浦区</address>
</person>
<person Text="负责人">
<name>
李四</name>
<sex>
男</sex>
<age>
28</age>
<address>
佛山市南海区</address>
</person>
</genre>
<genre name="华北地区">
<person Text="负责人">
<name>
王五</name>
<sex>
男</sex>
<age>
30</age>
<address>
北京市海淀区</address>
</person>
</genre>
</contact>
（4）从工具箱选择TreeView控件和XmlDataSource控件设计页面，把XmlDataSource控件DataFile属性设置成“~/App_Data/XMLFile.xml”，并把TreeView控件的DataSourceID属性设为“XmlDataSource1”。
<%@ Page Language="C#" AutoEventWireup="true" %>
<script runat="server">
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
this.TreeView1.ShowLines = true;
//以下是添加节点与数据源绑定的对应关系
TreeNodeBinding contact = new TreeNodeBinding();
contact.DataMember = "contact";//指定绑定的成员
contact.ValueField = "name";//取值的字段
this.TreeView1.DataBindings.Add(contact);
TreeNodeBinding genre = new TreeNodeBinding();
genre.DataMember = "genre";//添加与"地区"绑定
genre.ValueField = "name";
this.TreeView1.DataBindings.Add(genre);
TreeNodeBinding person = new TreeNodeBinding();
person.DataMember = "person";//添加与"负责人"绑定
person.ValueField = "Text";
this.TreeView1.DataBindings.Add(person);
TreeNodeBinding name = new TreeNodeBinding();
name.DataMember = "name";//添加与"名称"绑定
name.ValueField = "#InnerText";
this.TreeView1.DataBindings.Add(name);
TreeNodeBinding sex = new TreeNodeBinding();
sex.DataMember = "sex";//添加与"性别"绑定
sex.ValueField = "#InnerText";
this.TreeView1.DataBindings.Add(sex);
TreeNodeBinding age = new TreeNodeBinding();
age.DataMember = "age";//添加与"年龄"绑定
age.ValueField = "#InnerText";
this.TreeView1.DataBindings.Add(age);
TreeNodeBinding address = new TreeNodeBinding();
address.DataMember = "address";//添加与"地址"绑定
address.ValueField = "#InnerText";
this.TreeView1.DataBindings.Add(address);
}
}
</script>
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>TreeView绑定XML示例</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:XmlDataSource ID="XmlDataSource1" runat="server"
DataFile="~/App_Data/XMLFile.xml">
</asp:XmlDataSource>
</div>
<asp:TreeView ID="TreeView1" runat="server"
DataSourceID="XmlDataSource1">
</asp:TreeView>
</form>
</body>
</html>
（1）TreeNodeBinding类在TreeView控件中定义数据项与该数据项绑定到的节点之间的关系。该类的DataMember属性指定在节点显示的数据源对应XML的节点。ValueField属性对应TreeNode对象的Value属性。
