C#中操作XML

XML命名空间:using System.Xml;

1.XML文件（bookstore.xml）

<?xml version="1.0" encoding="utf-8"?>
<bookstore>
  <book genre="fantasy" ISBN="2-3631-4">
    <title>Oberon's Legacy</title>
    <author>Corets,Eva</author>
    <price>99.95</price>
  </book>
</bookstore>

2.往<bookstore>节点中插入一个<book>节点：

        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.Load(Server.MapPath("bookstore.xml"));
        XmlNode root = xmlDoc.SelectSingleNode("bookstore");
        //查找<bookstore>
        XmlElement xe1=xmlDoc.CreateElement("book");
        //创建一个<book>节点
        xe1.SetAttribute("genre","李赞红");
        //设置该节点genre属性
        xe1.SetAttribute("ISBN","2-3631-4");
        //设置该节点ISBN属性
        XmlElement xesub1=xmlDoc.CreateElement("title");
        xesub1.InnerText="CS从入门到精通";
        //设置文本节点
        xe1.AppendChild(xesub1);
        //添加到<book>节点中
        XmlElement xesub2=xmlDoc.CreateElement("author");
        xesub2.InnerText="候捷";
        xe1.AppendChild(xesub2);
        XmlElement xesub3=xmlDoc.CreateElement("price");
        xesub3.InnerText="58.3";
        xe1.AppendChild(xesub3);
        root.AppendChild(xe1);
        //添加到<bookstore>节点中
        xmlDoc.Save(Server.MapPath("bookstore.xml"));

结果：

<?xml version="1.0" encoding="utf-8"?>
<bookstore>
  <book genre="fantasy" ISBN="2-3631-4">
    <title>Oberon's Legacy</title>
    <author>Corets,Eva</author>
    <price>99.95</price>
  </book>
  <book genre="李赞红" ISBN="2-3631-4">
    <title>CS从入门到精通</title>
    <author>候捷</author>
    <price>58.3</price>
  </book>
</bookstore>

3.修改节点：将genre属性值为“李赞红“的节点的genre值改为“update李赞红”，将该节点的子节点<author>的文本修改为“亚胜”。

 XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.Load(Server.MapPath("bookstore.xml"));
        XmlNodeList nodeList = xmlDoc.SelectSingleNode("bookstore").ChildNodes;
        //获取bookstore节点的所有子节点
        foreach (XmlNode xn in nodeList) //遍历所有子节点        
        {    
           //将子节点类型转换为XmlElement类型 
           XmlElement xe=(XmlElement)xn;          
            if(xe.GetAttribute("genre")=="李赞红")
                //如果genre属性值为“李赞红”
            {
                //则修改该属性为“update李赞红” 
                xe.SetAttribute("genre","update李赞红");
                //继续获取xe子节点的所有子节点 
                XmlNodeList nls=xe.ChildNodes;               
                foreach(XmlNode xn1 in nls)                        
               {     
                    XmlElement xe2=(XmlElement)xn1;                   
                    if(xe2.Name=="author")                      
                    { 
                        xe2.InnerText="亚胜";                      
                        break; 
                    }        
                }         
                break;  
            }
        }
        xmlDoc.Save(Server.MapPath("bookstore.xml"));

结果：

<?xml version="1.0" encoding="utf-8"?>
<bookstore>
  <book genre="fantasy" ISBN="2-3631-4">
    <title>Oberon's Legacy</title>
    <author>Corets,Eva</author>
    <price>99.95</price>
  </book>
  <book genre="update李赞红" ISBN="2-3631-4">
    <title>CS从入门到精通</title>
    <author>亚胜</author>
    <price>58.3</price>
  </book>
</bookstore>

4.删除 <book genre="fantasy" ISBN="2-3631-4">节点的genre属性，删除 <book genre="update李赞红" ISBN="2-3631-4">节点

        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.Load(Server.MapPath("bookstore.xml"));
        XmlNodeList xnl=xmlDoc.SelectSingleNode("bookstore").ChildNodes; 
        foreach(XmlNode xn in xnl)
        {   
            XmlElement xe=(XmlElement)xn; 
            if(xe.GetAttribute("genre")=="fantasy") 
            {        
                xe.RemoveAttribute("genre");//删除genre属性 
            }    
            else if(xe.GetAttribute("genre")=="update李赞红")   
            {        
                xe.RemoveAll();//删除该节点的全部内容   
            }
        }
        xmlDoc.Save(Server.MapPath("bookstore.xml"));

结果：

<?xml version="1.0" encoding="utf-8"?>
<bookstore>
  <book ISBN="2-3631-4">
    <title>Oberon's Legacy</title>
    <author>Corets,Eva</author>
    <price>99.95</price>
  </book>
  <book>
  </book>
</bookstore>

5.显示所有数据。

        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.Load(Server.MapPath("bookstore.xml"));
        XmlNode xn=xmlDoc.SelectSingleNode("bookstore");
        XmlNodeList xnl=xn.ChildNodes;
        foreach(XmlNode xnf in xnl)
        {   

            //string author=xnf["author"].InnerText; 
            XmlElement xe=(XmlElement)xnf;
            Response.Write(xe.GetAttribute("genre") + "<br/>");//显示属性值 
            Response.Write(xe.GetAttribute("ISBN") + "<br/>");  
            XmlNodeList xnf1=xe.ChildNodes;  
            foreach(XmlNode xn2 in xnf1)   
            {
                Response.Write(xn2.InnerText + "<br/>");//显示子节点点文本   
            }
        }

XML

<?xml version="1.0" encoding="utf-8"?>
<bookstore>
  <book genre="fantasy" ISBN="2-3631-4">
    <title>Oberon's Legacy</title>
    <author>Corets,Eva</author>
    <price>99.95</price>
  </book>
  <book genre="李赞红" ISBN="2-3631-4">
    <title>CS从入门到精通</title>
    <author>候捷</author>
    <price>58.3</price>
  </book>
</bookstore>

读出来的数据

fantasy
2-3631-4
Oberon's Legacy
Corets,Eva
99.95
李赞红
2-3631-4
CS从入门到精通
候捷
58.3

 

6.修改XML

 XmlElement theCardName = null;
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load(xmlFileDir + "\\" + "CardModuleXML.xml");
            theCardName = (XmlElement)xmlDoc.DocumentElement.SelectSingleNode("/CardModule_Table/CardModule[CardName='爱婴卡']");
            theCardName.GetElementsByTagName("TiShi1").Item(0).InnerText ="False";
            theCardName.GetElementsByTagName("TiShi2").Item(0).InnerText = "False";
            xmlDoc.Save(xmlFileDir + "\\" + "CardModuleXML.xml");

XML

<?xml version="1.0" encoding="utf-8"?>
<CardModule_Table>
  <CardModule>
    <CardName>爱婴卡</CardName>
    <TiShi1>True</TiShi1>
    <TiShi2>False</TiShi2>
    <TiShi3>False</TiShi3>
    <TiShi4>False</TiShi4>
    <DangDangKa>False</DangDangKa>
    <LiangCheKa>False</LiangCheKa>
    <ShangWuKa>False</ShangWuKa>
  </CardModule>
 <CardModule>
    <CardName>按揭卡</CardName>
    <TiShi1>True</TiShi1>
    <TiShi2>False</TiShi2>
    <TiShi3>False</TiShi3>
    <TiShi4>False</TiShi4>
    <DangDangKa>False</DangDangKa>
    <LiangCheKa>False</LiangCheKa>
    <ShangWuKa>False</ShangWuKa>
  </CardModule>
</CardModule_Table>