<?xml version="1.0" encoding="utf-8"?>

 <PersonF xmlns="" Name="(test)work hard work smart!">

   <person Name="Person1">

     <ID>1</ID>

     <Name>XiaoA</Name>

     <Age>59</Age>

   </person>

   <person Name="Person2">

     <ID>2</ID>

     <Name>XiaoB</Name>

     <Age>29</Age>

   </person>

   <person Name="Person3">

     <ID>3</ID>

     <Name>XiaoC</Name>

     <Age>103</Age>

   </person>

   <person Name="Person4">

     <ID>4</ID>

     <Name>XiaoD</Name>

     <Age>59</Age>

   </person>

 </PersonF>

 　　　　　　　string path = @"E:\测试\XML读取\XML.xml";

             XmlDocument xd = new XmlDocument();

             try

             {

                 xd.Load(path);

                 switch (count)

                 {

                     case :

                         //1、读取单个节点的数据

                         XmlNode xn1= xd.SelectSingleNode("PersonF");

                         richTextBox1.Text = xn1.InnerText.ToString();

                         count++;break;

                     case :

                         //2、读取多个节点的数据

                         XmlNodeList xn2 = xd.SelectNodes("PersonF/person");

                         foreach (XmlNode xn in xn2)

                         {

                             richTextBox1.Text += xn.InnerText;

                         }

                         count++;break;

                     case :

                         //3.1、读取具体节点的具体值 如：Name属性为Person2的Name的InnerText

                         XmlNodeList xn3 = xd.DocumentElement.GetElementsByTagName("person");

                         foreach (XmlNode xn in xn3)

                         {

                             if (xn.Attributes["Name"].InnerText == "Person2")

                             {

                                 richTextBox1.Text += xn.InnerText;

                             }

                         }

                         count++; break;

                     case :

                         //3.2、读取ID为2所在的节点第二个子节点Name的InnerText

                         XmlNode xn4 = xd.SelectSingleNode("PersonF/person[ID=2]");

                         richTextBox1.Text = xn4.ChildNodes[].InnerText;

                         count++; break;

                     case :

                         //3.3、找到ID为2的节点的父节点Name属性

                         XmlNodeList xn5 = xd.SelectNodes("//person//ID");//读取ID为2的节点

                         foreach (XmlNode xn in xn5)

                         {

                             if (xn.InnerText == "")

                             {

                                 richTextBox1.Text += xn.ParentNode.Attributes["Name"].InnerText;

                             }

                         }

                         count++;break;

                     case :

                         //4、修改节点属性

                         XmlNode xn6 = xd.SelectSingleNode("PersonF");

                         xn6.Attributes["Name"].InnerText = "helloworld";

                         xd.Save(path);

                         count++; break;

                     case :

                         //5、添加自定义节点

                         XmlTextReader xr = new XmlTextReader(path);

                         XmlElement root = xd.DocumentElement;//根节点（最外层节点）

                         XmlElement newele = xd.CreateElement("person");//第二层节点

                         newele.SetAttribute("Name", "Person6");

                         XmlElement ele_id = xd.CreateElement("ID");//newele子节点

                         ele_id.InnerText = "";

                         XmlElement ele_name = xd.CreateElement("Name");//newele子节点

                         ele_name.InnerText = "XiaoE";

                         newele.AppendChild(ele_id);

                         newele.AppendChild(ele_name);

                         root.AppendChild(newele);

                         xr.Close();

                         xd.Save(path);

                         count=; break;

                 }

             }

             catch

             {

                 Exception ex;

             }