C#中对XML文件的一些基本操作

Code
//定义XMLDocument
            XmlDocument xmlDocument = new XmlDocument();
            //定义XML文档头文件
            XmlDeclaration xmlDeclaration = xmlDocument.CreateXmlDeclaration("1.0","utf-8",null);
            //增加XML文档头
            xmlDocument.AppendChild(xmlDeclaration);
            //定义XML的根
            XmlElement xmlRoot = xmlDocument.CreateElement("userdata");
            //添加根的属性
            xmlRoot.SetAttribute("createuser","true");
            //修改根属性的值
            xmlRoot.GetAttributeNode("createuser").Value = "false";
            //添加子节点并设置子节点属性
            xmlDocument.AppendChild(xmlRoot);
            XmlElement dataconnection = xmlDocument.CreateElement("dataconnection");
            XmlElement server = xmlDocument.CreateElement("server");
            server.InnerText = "localhost";
            XmlElement uid = xmlDocument.CreateElement("uid");
            uid.InnerText = "sa";
            XmlElement pwd = xmlDocument.CreateElement("pwd");
            xmlRoot.AppendChild(dataconnection);
            dataconnection.AppendChild(server);
            dataconnection.AppendChild(uid);
            dataconnection.AppendChild(pwd);
            //保存XML文档
            xmlDocument.Save("book.xml");
            //读取子节点server的值
            XmlNode xnserver = xmlDocument.SelectSingleNode("userdata/dataconnection/server");
            Console.WriteLine("node server's value is "+ xnserver.InnerText);
            Console.ReadLine();

生成的XML代码如下:

 

Code
<?xml version="1.0" encoding="utf-8"?>
<userdata createuser="false">
  <dataConnection>
    <server>localhost</server>
    <uid>sa</uid>
    <pwd />
  </dataConnection>
</userdata>

 

 

代码

这是以前自己做过的一个测试。楼主可以参考一下。

======================= bookstore.XML内容 ====================
<? xml version = " 1.0 "  encoding = " gb2312 " ?>
< bookstore >
   < book >
   </ book >
   < book >
   </ 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 >
   < 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 >

======================= 读取 ========================
            XmlDocument doc  =   new  XmlDocument();
            doc.Load( @" d:\bookstore.xml " );
            XmlElement root  =  doc.DocumentElement;


            MessageBox.Show(root.SelectNodes( " book " )[ 0 ].InnerText);

======================= 添加 =========================
            XmlDocument xmlDoc  =   new  XmlDocument();
            xmlDoc.Load( @" d:\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 " ); // 设置该节点的genre属性
            xe1.SetAttribute( " ISBN " ,  " 2-3631-4 " ); // 设置该节点的ISBN属性

            XmlElement xesub1  =  xmlDoc.CreateElement( " title " ); // 添加一个名字为title的子节点
            xesub1.InnerText  =   " CS从入门到精通 " ; // 设置文本
            xe1.AppendChild(xesub1); // 把title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); // 把book添加到<bookstore>根节点中
            xmlDoc.Save( @" d:\bookstore.xml " );

====================== 修改 ========================
            XmlDocument xmlDoc  =   new  XmlDocument();
            xmlDoc.Load( @" d:\bookstore.xml " );
            XmlNodeList nodeList  =  xmlDoc.SelectSingleNode( " bookstore " ).ChildNodes; // 获取bookstore节点的所有子节点
             foreach  (XmlNode xn  in  nodeList) // 遍历所有名字为bookstore的子节点
            {
                XmlElement xe  =  (XmlElement)xn; // 将子节点类型转换为XmlElement类型
                 if  (xe.GetAttribute( " genre " )  ==   " 李赞红 " ) // 如果genre属性值为“李赞红”
                {
                    xe.SetAttribute( " genre " ,  " update李赞红 " ); // 则修改该属性为“update李赞红”

                    XmlNodeList nls  =  xe.ChildNodes; // 继续获取xe(xn)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  ==   " author " ) // 如果找到
                        {
                            xe2.InnerText  =   " 亚胜 " ; // 则修改
                             break ; // 找到退出来
                        }
                    }
                     break ;
                }
            }
            xmlDoc.Save( @" d:\bookstore.xml " ); // 保存。

======================== 删除 =========================

            XmlDocument xmlDoc  =   new  XmlDocument();
            xmlDoc.Load( @" d:\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( @" d:\bookstore.xml " ); 

 

 

转载于:https://www.cnblogs.com/qiantuwuliang/archive/2009/05/30/1492463.html