代碼如下:
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Xml;
private XmlDocument xmlDoc;
//load xml file
private void LoadXml()
{
    xmlDoc=new XmlDocument();
    xmlDoc.Load(Server.MapPath("User.xml"));
}
//添加節(jié)點(diǎn)
private void AddElement()
{
    LoadXml();
    XmlNode xmldocSelect=xmlDoc.SelectSingleNode("user");
    XmlElement el=xmlDoc.CreateElement("person");     //添加person節(jié)點(diǎn)
    el.SetAttribute("name","風(fēng)云");     //添加person節(jié)點(diǎn)的屬性"name"
    el.SetAttribute("sex","女");     //添加person節(jié)點(diǎn)的屬性 "sex"
    el.SetAttribute("age","25");     //添加person節(jié)點(diǎn)的屬性 "age"
    XmlElement xesub1=xmlDoc.CreateElement("pass");     //添加person節(jié)點(diǎn)的里的節(jié)點(diǎn)
    xesub1.InnerText="123";    //設(shè)置文本節(jié)點(diǎn)
    el.AppendChild(xesub1);
    XmlElement xesub2=xmlDoc.CreateElement("Address");
    xesub2.InnerText="昆明";    //設(shè)置文本節(jié)點(diǎn)
    el.AppendChild(xesub2);
    xmldocSelect.AppendChild(el);
    xmlDoc.Save(Server.MapPath("user.xml"));
}
//修改節(jié)點(diǎn)
private void UpdateElement()
{
    LoadXml();
    XmlNodeList nodeList=xmlDoc.SelectSingleNode("user").ChildNodes;    //獲取bookstore節(jié)點(diǎn)的所有子節(jié)點(diǎn)
    foreach(XmlNode xn in nodeList)    //遍歷所有子節(jié)點(diǎn)
    {
        XmlElement xe=(XmlElement)xn;    //將子節(jié)點(diǎn)類型轉(zhuǎn)換為XmlElement類型
        if(xe.GetAttribute("name")=="風(fēng)云")     //如果name屬性值為“風(fēng)云”
        {
            xe.SetAttribute("name","發(fā)明"); //如果下面有子節(jié)點(diǎn)在下走
            XmlNodeList nls=xe.ChildNodes;//繼續(xù)獲取xe子節(jié)點(diǎn)的所有子節(jié)點(diǎn)
            foreach(XmlNode xn1 in nls)//遍歷
            {
                XmlElement xe2=(XmlElement)xn1;//轉(zhuǎn)換類型
                if(xe2.Name=="pass")//如果找到
                {
                    xe2.InnerText="66666";//則修改
                    break;
                }
            }
            break;
        }
    }
    xmlDoc.Save(Server.MapPath("user.xml"));//保存
}
//刪出節(jié)點(diǎn)
private void deleteNode()
{
    LoadXml();
    XmlNodeList xnl=xmlDoc.SelectSingleNode("user").ChildNodes;
    foreach(XmlNode xn in xnl)
    {
        XmlElement xe=(XmlElement)xn;
        if(xe.GetAttribute("name")=="發(fā)明")
        {
            //xe.RemoveAttribute("name");//刪除name屬性
            xe.RemoveAll();//刪除該節(jié)點(diǎn)的全部內(nèi)容
            break;
        }
    }
    xmlDoc.Save(Server.MapPath("user.xml"));//保存
}
private void showIt()
{
    LoadXml();
    XmlNode xn=xmlDoc.SelectSingleNode("user");
    XmlNodeList xnl=xn.ChildNodes;
    foreach(XmlNode xnf in xnl)
    {
        XmlElement xe=(XmlElement)xnf;
        // Console.WriteLine(xe.GetAttribute("name"));//顯示屬性值
        // Console.WriteLine(xe.GetAttribute("sex"));
        // // XmlNodeList xnf1=xe.ChildNodes;
        // foreach(XmlNode xn2 in xnf1) //
        {
            // Console.WriteLine(xn2.InnerText);
            //顯示子節(jié)點(diǎn)點(diǎn)文本
    // }
    }
}

Xml的樣式:
代碼如下:
<?xml version="1.0" encoding="gb2312"?>
<user>
    <person> </person>
    <person name="風(fēng)拉" sex="男" age="25">
        <pass>123</pass>
        <Address>大明</Address>
    </person>
    <person name="風(fēng)云" sex="女" age="25">
        <pass>123</pass>
        <Address>昆明</Address>
    </person>
</user>

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