ASP. Read/write to XML file, add, modify, delete operations

usingSystem;usingSystem.Collections;usingSystem.ComponentModel;usingSystem.Data;usingSystem.Drawing;usingsystem.web;usingSystem.Web.SessionState;usingSystem.Web.UI;usingSystem.Web.UI.WebControls;usingSystem.Web.UI.HtmlControls;usingSystem.Xml;PrivateXmlDocument xmldoc; //Load XML file        Private voidLoadXml () {xmldoc=NewXmlDocument (); Xmldoc.load (Server.MapPath ("User.xml")); }         //Adding nodes        Private voidaddelement () {LoadXml (); XmlNode Xmldocselect=xmldoc.selectsinglenode ("User"); XmlElement El=xmldoc.createelement (" Person");//Add Person nodeEl. SetAttribute ("name","Cloud");//Add the property "name" of the person nodeEl. SetAttribute ("Sex","female");//Add the properties of the person node "sex"El. SetAttribute (" Age"," -");//Add the property "age" of the person nodeXmlElement xesub1=xmldoc.createelement ("Pass");//Add a node in the person nodeXesub1. innertext="123";//Set the text nodeel.             AppendChild (XESUB1); XmlElement XESUB2=xmldoc.createelement ("Address"); Xesub2. InnerText="Kunming";//Set the text nodeel.             AppendChild (XESUB2);            Xmldocselect.appendchild (EL); Xmldoc.save (Server.MapPath ("User.xml")); }         //Modify Node        Private voidupdateelement () {LoadXml (); XmlNodeList NodeList=xmldoc.selectsinglenode ("User"). ChildNodes;//get all child nodes of the bookstore node            foreach(XmlNode xninchNodeList)//Traverse all child nodes{XmlElement XE= (XmlElement) xn;//To Convert a child node type to a XmlElement type                if(XE. GetAttribute ("name")=="Cloud")//if the Name property value is "cloud"{XE. SetAttribute ("name","Inventions"); //If there are child nodes below, go down.XmlNodeList Nls=xe. ChildNodes;//continue to acquire all child nodes of the XE child node                    foreach(XmlNode xn1inchNls//Traverse{XmlElement Xe2= (XmlElement) xn1;//Conversion Type                        if(Xe2. name=="Pass")//If you find{Xe2. InnerText="66666";//then modify                             Break; }                    }                      Break; }} xmldoc.save (Server.MapPath ("User.xml"));//Save        }          //Delete a node        Private voidDeletenode () {LoadXml (); XmlNodeList XNL=xmldoc.selectsinglenode ("User").              ChildNodes; foreach(XmlNode xninchxnl) {XmlElement XE=(XmlElement) xn; if(XE. GetAttribute ("name")=="Inventions")                {                    //XE. RemoveAttribute ("name");//Remove the Name propertyXe. RemoveAll ();//Delete the entire contents of the node                     Break; }} xmldoc.save (Server.MapPath ("User.xml"));//Save        }         Private voidShowit () {LoadXml (); XmlNode xn=xmldoc.selectsinglenode ("User"); XmlNodeList XNL=xn.                ChildNodes; foreach(XmlNode xnfinchxnl) {XmlElement XE=(XmlElement) xnf;//Console.WriteLine (XE. GetAttribute ("name"));//Display property Values//Console.WriteLine (XE. GetAttribute ("Sex"));// //XmlNodeList Xnf1=xe. ChildNodes;//foreach (XmlNode xn2 in Xnf1)//                {//Console.WriteLine (xn2. InnerText);//Show child node point text//                }}} XML style:<?xml version="1.0"encoding="gb2312"?><user> <person> </person> <person name="Wind Pull"sex="male"Age=" -"> <pass>123</pass> <Address> daming </Address> </person> <person name="Cloud"sex="female"Age=" -"> <pass>123</pass> <Address> Kunming </Address> </person></user>

ASP. Read/write to XML file, add, modify, delete operations