xml的几种用法方法

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"));

        }

        //添加节点

        private void AddElement()

        {

           

            LoadXml();

            XmlNode xmldocSelect=xmlDoc.SelectSingleNode("user");

           

            XmlElement el=xmlDoc.CreateElement("person"); //添加person节点

            el.SetAttribute("name","风云"); //添加person节点的属性"name"

            el.SetAttribute("sex","女");   //添加person节点的属性 "sex"

            el.SetAttribute("age","25");   //添加person节点的属性 "age"

           

             XmlElement xesub1=xmlDoc.CreateElement("pass"); //添加person节点的里的节点

             xesub1.InnerText="123";//设置文本节点

             el.AppendChild(xesub1);

             XmlElement xesub2=xmlDoc.CreateElement("Address");

             xesub2.InnerText="昆明";//设置文本节点

             el.AppendChild(xesub2);

            xmldocSelect.AppendChild(el);

            xmlDoc.Save(Server.MapPath("user.xml"));

        }

       

        //修改节点

        private void UpdateElement()

        {

            LoadXml();

            XmlNodeList nodeList=xmlDoc.SelectSingleNode("user").ChildNodes;//获取bookstore节点的所有子节点

            foreach(XmlNode xn in nodeList)//遍历所有子节点

            {

                XmlElement xe=(XmlElement)xn;//将子节点类型转换为XmlElement类型

                if(xe.GetAttribute("name")=="风云")//如果name属性值为“风云”

                {

                    xe.SetAttribute("name","发明");

                   

                    //如果下面有子节点在下走

                     XmlNodeList nls=xe.ChildNodes;//继续获取xe子节点的所有子节点

                    foreach(XmlNode xn1 in nls)//遍历

                    {

                       XmlElement xe2=(XmlElement)xn1;//转换类型

                        if(xe2.Name=="pass")//如果找到

                        {

                            xe2.InnerText="66666";//则修改

                            break;

                        }

                    }

                    break;

                }

            }

           xmlDoc.Save(Server.MapPath("user.xml"));//保存

        }

        //删出节点

        private void deleteNode()

        {

           

            LoadXml();

            XmlNodeList xnl=xmlDoc.SelectSingleNode("user").ChildNodes;

            foreach(XmlNode xn in xnl)

            {

                XmlElement xe=(XmlElement)xn;

               

                if(xe.GetAttribute("name")=="发明")

                {

                    //xe.RemoveAttribute("name");//删除name属性

                    xe.RemoveAll();//删除该节点的全部内容

                   

                    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"));//显示属性值

//                Console.WriteLine(xe.GetAttribute("sex"));

//

//                XmlNodeList xnf1=xe.ChildNodes;

//                foreach(XmlNode xn2 in xnf1)

//                {

//                    Console.WriteLine(xn2.InnerText);//显示子节点点文本

//                }

            }

        }

   

Xml的样式:

<?xml version="1.0" encoding="gb2312"?>

<user>

  <person>

  </person>

  <person name="风拉" sex="男" age="25">

    <pass>123</pass>

    <Address>大明</Address>

  </person>

  <person name="风云" sex="女" age="25">

    <pass>123</pass>

    <Address>昆明</Address>

  </person>

</user>

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