C#操作XMl-2
用的是一種很笨的方法,但可以幫助初學者了解訪問XML節點的過程。已知有一個XML文件(bookstore.xml)如下:<?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>1、往<bookstore>節點中插入一個<book>節點:XmlDocument xmlDoc=new XmlDocument();xmlDoc.Load("bookstore.xml");XmlNode root=xmlDoc.SelectSingleNode("bookstore");//查找<bookstore>XmlElement xe1=xmlDoc.CreateElement("book");//創建一個<book>節點xe1.SetAttribute("genre","李贊紅");//設置該節點genre屬性xe1.SetAttribute("ISBN","2-3631-4");//設置該節點ISBN屬性XmlElement xesub1=xmlDoc.CreateElement("title");xesub1.InnerText="CS從入門到精通";//設置文本節點xe1.AppendChild(xesub1);//添加到<book>節點中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>節點中xmlDoc.Save("bookstore.xml");//================結果為:<?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="李贊紅" ISBN="2-3631-4"><title>CS從入門到精通</title><author>候捷</author><price>58.3</price></book>
</bookstore>2、修改節點:將genre屬性值為“李贊紅“的節點的genre值改為“update李贊紅”,將該節點的子節點<author>的文本修改為“亞勝”。XmlNodeList nodeList=xmlDoc.SelectSingleNode("bookstore").ChildNodes;//獲取bookstore節點的所有子節點foreach(XmlNode xn in nodeList)//遍歷所有子節點{XmlElement xe=(XmlElement)xn;//將子節點類型轉換為XmlElement類型if(xe.GetAttribute("genre")=="李贊紅")//如果genre屬性值為“李贊紅”{xe.SetAttribute("genre","update李贊紅");//則修改該屬性為“update李贊紅”XmlNodeList nls=xe.ChildNodes;//繼續獲取xe子節點的所有子節點foreach(XmlNode xn1 in nls)//遍歷{XmlElement xe2=(XmlElement)xn1;//轉換類型if(xe2.Name=="author")//如果找到{xe2.InnerText="亞勝";//則修改break;//找到退出來就可以了}}break;}}xmlDoc.Save("bookstore.xml");//保存。//=================最后結果為:<?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李贊紅" ISBN="2-3631-4"><title>CS從入門到精通</title><author>亞勝</author><price>58.3</price></book>
</bookstore>3、刪除 <book genre="fantasy" ISBN="2-3631-4">節點的genre屬性,刪除 <book genre="update李贊紅" ISBN="2-3631-4">節點。XmlNodeList xnl=xmlDoc.SelectSingleNode("bookstore").ChildNodes;foreach(XmlNode xn in xnl){XmlElement xe=(XmlElement)xn;if(xe.GetAttribute("genre")=="fantasy"){xe.RemoveAttribute("genre");//刪除genre屬性}else if(xe.GetAttribute("genre")=="update李贊紅"){xe.RemoveAll();//刪除該節點的全部內容}}xmlDoc.Save("bookstore.xml");//====================最后結果為:<?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>4、顯示所有數據。XmlNode xn=xmlDoc.SelectSingleNode("bookstore");XmlNodeList xnl=xn.ChildNodes;foreach(XmlNode xnf in xnl){XmlElement xe=(XmlElement)xnf;Console.WriteLine(xe.GetAttribute("genre"));//顯示屬性值Console.WriteLine(xe.GetAttribute("ISBN"));XmlNodeList xnf1=xe.ChildNodes;foreach(XmlNode xn2 in xnf1){Console.WriteLine(xn2.InnerText);//顯示子節點點文本}} 轉載自:http://blog.csdn.net/s98/archive/2004/10/17/140307.aspxXmlDocument xmlDoc=new XmlDocument();xmlDoc.Load("c:/aaa.xml");XmlNode xn=xmlDoc.SelectSingleNode("todate");XmlNodeList xnl=xn.ChildNodes;foreach(XmlNode xnf in xnl){XmlElement xe=(XmlElement)xnf;XmlNodeList xnf1=xe.ChildNodes;Response.Write(xnf1[0].InnerText);//顯示子節點點文本} XmlDocument xmlDoc=new XmlDocument();xmlDoc.Load("c:/aaa.xml");XmlNode xn=xmlDoc.SelectSingleNode("todate");XmlNodeList xnl=xn.ChildNodes;foreach(XmlNode xnf in xnl){XmlElement xe=(XmlElement)xnf;XmlNodeList xnf1=xe.ChildNodes;xnf1[0].InnerText="10";xmlDoc.Save("c:/aaa.xml");
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