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<?xml version="1.0" encoding="utf-8" ?>
<employees>
<employee on="01">
<name>Tom</name>
<sex>男</sex>
<birth>
<year>1982</year>
<month>5</month>
<day>22</day>
</birth>
<sales>
<year>2010</year>
<month>1</month>
<sale>320000</sale>
</sales>
<salary>8600</salary>
</employee>
<employee on="02">
<name>Jack</name>
<sex>男</sex>
<birth>
<year>1981</year>
<month>7</month>
<day>10</day>
</birth>
<sales>
<year>2010</year>
<month>1</month>
<sale>300000</sale>
</sales>
<salary>6000</salary>
</employee>
<employee on="03">
<name>Jennifer</name>
<sex>女</sex>
<birth>
<year>1982</year>
<month>6</month>
<day>22</day>
</birth>
<sales>
<year>2010</year>
<month>1</month>
<sale>500000</sale>
</sales>
<salary>7000</salary>
</employee>
</employees>
=============================================================
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Xml.XPath;
namespace WebApplication
{
public partial class XPathNav : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnNav_Click(object sender, EventArgs e)
{
//创建XPathDocument对象
XPathDocument xdoc = new XPathDocument(Server.MapPath("~/employees.xml"));
//创建Xpath导航
XPathNavigator xnav = xdoc.CreateNavigator();
//装入迭代器（结果）
XPathNodeIterator iterator = xnav.Select("descendant::employee");
string outPut = "";
while(iterator.MoveNext()){
outPut += "员工：" + iterator.Current.SelectSingleNode("name").Value+"<br/>"; //在当前节点下查找单一的节点name的值
outPut += " " + "工资：" + iterator.Current.SelectSingleNode("salary").Value + "<br/>"; // 在当前节点下查找单一的节点salary的值
outPut += "<hr>";
}
outPut += "<hr>";
Int32 avgSal = (Int32)(Double)xnav.Evaluate("sum(//employee/salary) div count(//employee)");
outPut += "平均工资：￥"+avgSal.ToString();
this.divOut.InnerHtml = outPut;
}
}
}
===================================================================
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="XPathNav.aspx.cs" Inherits="WebApplication.XPathNav" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:Button runat="server" ID="btnNav" Text="Navigate" OnClick="btnNav_Click" />
<div runat="server" id="divOut">
</div>
</div>
</form>
</body>
</html>
=================================================================
XPath相关笔记
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原文地址：http://www.cnblogs.com/blogLYF/p/5653954.html
