C#读写xml文件应用

<?xml version="1.0" encoding="gb2312"?> 

<bookstore> 

<book genre="fantasy" ISBN="2-3631-4"> 

<title>Oberon's Legacy</title> 

<author>Corets, Eva</author> 

<price>5.95</price> 

</book> 

</bookstore> 

CodeXmlDocument 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("bookstore.xml"); 

<?xml version="1.0" encoding="gb2312"?> 

<bookstore> 

<book genre="fantasy" ISBN="2-3631-4"> 

<title>Oberon's Legacy</title> 

<author>Corets, Eva</author> 

<price>5.95</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> 

CodeXmlNodeList 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。 

<?xml version="1.0" encoding="gb2312"?> 

<bookstore> 

<book genre="fantasy" ISBN="2-3631-4"> 

<title>Oberon's Legacy</title> 

<author>Corets, Eva</author> 

<price>5.95</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>