作用：
用来保存class对象的全部属性。
语法：
< > 必须成对出现
<!--这个是注释-->
<Student> </Student> 必须成对出现，Student也叫元素标签
<Name> 维修电工 </Name> 中间是【元素】的值
<? ?> 这个是处理指令
源码：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;using System.Xml;//引入命名空间namespace XMLDemo
{public partial class FrmReadXML : Form{public FrmReadXML(){InitializeComponent();}private void btnLoadXML_Click(object sender, EventArgs e){XmlDocument objDoc = new XmlDocument(); //【1】创建XML文档操作对象objDoc.Load("StuScore.xml"); //【2】加载XML文件到文档对象中XmlNode rootNode = objDoc.DocumentElement; //【3】获取XML文档根目录List<Student> list = new List<Student>();//创建对象集合 foreach (XmlNode stuNode in rootNode.ChildNodes) //【4】遍历根节点（根节点包含所有节点）{if (stuNode.Name == "Student"){Student objStu = new Student();foreach (XmlNode subNode in stuNode) //【5】遍历子节点{switch (subNode.Name)//根据子节点的名称封装到对象的属性{case "StuName":objStu.StuName = subNode.InnerText;//获取《节点名称》对应的《节点值》break;case "StuAge":objStu.StuAge = Convert.ToInt16(subNode.InnerText);break;case "Gender":objStu.Gender = subNode.InnerText;break;case "ClassName":objStu.ClassName = subNode.InnerText;break;}}list.Add(objStu);}}this.dgvStuList.DataSource = list;}//显示版本信息private void btnShowVersion_Click(object sender, EventArgs e){//创建XML读取器XmlTextReader tReader = new XmlTextReader("StuScore.xml");string info = string.Empty;//循环查询while (tReader.Read()){if (tReader.Name == "Version"){info = "版本：" + tReader.GetAttribute("vNo") + " 发布时间：" + tReader.GetAttribute("pTime");break;}}MessageBox.Show(info,"数据版本");}}
}
