XPathDocument的相关用法（待整理）

<?xml version="1.0" encoding="utf-8"?>
<notepad>
<topic>主题</topic>
<content>内容内容</content>
</notepad>

xpath.aspx
<%@Page Language="c#" ValidateRequest="false" Debug="true"%>
<%@Import Namespace="System.Xml.XPath"%>
<Script Language="C#" Runat="Server">
public void Page_Load(Object src,EventArgs e)
{
XPathDocument doc = new XPathDocument(Server.MapPath("demo.xml"));
XPathNavigator nav = doc.CreateNavigator();
XPathNodeIterator ite = nav.Select("/notepad/topic");
//移动到下一个节点，下一个节点是文字节点。
ite.MoveNext();
Response.Write (ite.Current.Value);
ite = nav.Select("/notepad/content");
//移动到下一个节点，下一个节点是文字节点。
ite.MoveNext();
Response.Write (ite.Current.Value);
}
</Script>

C#

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

namespace convertDell
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}

private void Convertbutton_Click(object sender, EventArgs e)
{
// char[] Oldchar = {'?', '3', '2', '4'};
string[] OldString;
XPathDocument XPathDom;
XPathNavigator XPathNav;
XPathNodeIterator XPathNodeIte;
string ExpressionStr,Newchar;
ExpressionStr = string.Empty;
Newchar = string.Empty;
//OldString = string.Empty;
OldString = OldtextBox.Text.Split(new char[]{'\r','\n'},StringSplitOptions.RemoveEmptyEntries);
XPathDom=new XPathDocument("ConvertRull.xml");
XPathNav = XPathDom.CreateNavigator();

foreach (string Old in OldString)
{
ExpressionStr = "convertrull/rull1/word[@old='" + Old + "']";
XPathNodeIte = XPathNav.Select(ExpressionStr);
/*
while (XPathNodeIte.MoveNext())
Newchar += XPathNodeIte.Current.Value + "\r\n";
*/
XPathNodeIte.MoveNext();
//移动到下一个结点，下一个结点才是文字结点,当前结点是元素结点，若没往下移，取出来的
//值则是元素的值，若元素有好多个相同，则值就好多个,即去掉MoveNext()这行代码
Newchar += XPathNodeIte.Current.Value + "\r\n";
}
ConverttotextBox.Text = Newchar;
}
}
}