C#对XML文件的读写

假设有如下XML文件:

bookstore.xml

<? xml version="1.0" encoding="gb2312" ?>
< bookstore >
   < book  ISBN ="2-3631-4" >
     < title > Oberon's Legacy </ title >
     < author > Corets, Eva </ author >
     < price > 5.95 </ price >
   </ book >
   < book >
   </ book >

</bookstore>   

 

代码

using  System.Xml;
using  System;

namespace  XML文件的读写
{
     class  Program
    {
         #region  1.往<bookstore>节点中插入一个<book>节点
         static   void  Method1()
        {
            XmlDocument xmlDoc  =   new  XmlDocument();
            xmlDoc.Load( " 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 " ); // 设置节点genre属性
            xe1.SetAttribute( " ISBN " ,  " 2-3631-4 " ); // 设置节点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  =   " 侯捷 " ;
            xe1.AppendChild(xesub2);
            XmlElement xesub3  =  xmlDoc.CreateElement( " price " );
            xesub3.InnerText  =   " 58.3 " ;
            xe1.AppendChild(xesub3);

            root.AppendChild(xe1);
            xmlDoc.Save( " bookStore.xml " );
        }
         #endregion

         #region  2.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”。
         static   void  Method2()
        { 
            XmlDocument xmlDoc  =   new  XmlDocument();
            xmlDoc.Load( " 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
            {
                XmlElement xe  =  (XmlElement)xn; // 将子节点类型转化为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"updata李赞红"

                    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  ==   " author " ) // 如果找到
                        { 
                            xe2.InnerText  =   " 亚胜 " ; // 则修改
                             break ; // 找到退出来就可以了
                        }
                    }
                     break ;
                }
            }
            xmlDoc.Save( " bookstore.xml " ); // 保存
        }
         #endregion

         #region  3.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
         static   void  method3()
        {
            XmlDocument xmlDoc  =   new  XmlDocument();
            xmlDoc.Load( " 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gener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( " bookstore.xml " );
        }
         #endregion

         #region  4.显示所有数据。
         static   void  Method4()
        {
            XmlDocument xmlDoc  =   new  XmlDocument();
            xmlDoc.Load( " bookstore.xml " );

            XmlNode xn  =  xmlDoc.SelectSingleNode( " bookstore " );

            XmlNodeList xnl  =  xn.ChildNodes;

             foreach  (XmlNode xnf  in  xnl)
            {
                XmlElement xe  =  (XmlElement)xnf;
                Console.WriteLine(xe.GetAttribute( " genre " )); // 显示属性值
                Console.WriteLine(xe.GetAttribute( " ISBN " ));

                XmlNodeList xnf1  =  xe.ChildNodes;
                 foreach  (XmlNode xn2  in  xnf1)
                {
                    Console.WriteLine(xn2.InnerText); // 显示子节点文本
                }
            }
        }
         #endregion

         static   void  Main( string [] args)
        {
             // Method1();
             // Method2();
             // method3();
             // Method4();
        }
    }
}