C # reads and writes an XML file

XML (extensible Markup Language ) file, which can be used to tag data, define data types, is a source language that allows users to define their own markup language.

The difference between XML and HTML design is that XML is designed to transmit and store data, with the focus on the content of the data. HTML is designed to display data, and its focus is on the appearance of the data. HTML is designed to display information, while XML is designed to transmit information.

XML and HTML syntax differences: HTML markup is not all need to appear in pairs, the XML requires that all tags must appear in pairs; HTML tags are case-insensitive, XML is case-sensitive.

in ASP. C # We need to read and write information to an existing XML file, with the following code:

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//创建实例，读取XML XmlDocument xmldoc = new XmlDocument(); string path = HttpContext.Current.Server.MapPath("../XMLFile/ChatInfor.xml"); xmldoc.Load(path); //查找根节点   XmlNode chat = xmldoc.SelectSingleNode("Chat"); //创建节点   XmlElement infor = xmldoc.CreateElement("infor"); //设置属性   infor.SetAttribute("id", mid);  XmlElement xuser = xmldoc.CreateElement("userid"); //插入文本   xuser.InnerText = uid; infor.AppendChild(xuser); XmlElement xdate = xmldoc.CreateElement("date"); xdate.InnerText = date; infor.AppendChild(xdate); XmlElement xmess = xmldoc.CreateElement("content"); xmess.InnerText = mess; infor.AppendChild(xmess); //存入根节点，保存文件   chat.AppendChild(infor); xmldoc.Save(path);

PS: The mid,uid,date,mess in the previous code is the passed parameter;

The XML file format is stored as follows:

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<?xml version="1.0" encoding="utf-8"?><Chat>  <infor id="71b6384d-0dad-62eb-c952-c718d33b3374">    <userid>2</userid>    <date>2013-03-13 12:30:01</date>    <content>大家好！</content>  </infor>  <infor id="a179c895-9521-150e-2548-1872cfd2fd93">    <userid>1</userid>    <date>2013-03-13 12:30:50</date>    <content>你好！</content>  </infor>  <infor id="2c0f2313-13af-f71b-f1a2-8b2e188d5536">    <userid>2</userid>    <date>2013-05-27 15:05:23</date>    <content>1235364564</content>  </infor>  <infor id="d508830e-658f-2adf-88f6-4ef6d9295a88">    <userid>1</userid>    <date>2013-05-27 15:05:30</date>    <content>啊啊啊啊</content>  </infor>  <infor id="37cf60ad-76a6-2983-4a82-bfea197201cd">    <userid>3</userid>    <date>2013-05-27 15:05:35</date>    <content>灌灌灌灌灌</content>  </infor>  </Chat>

C # reads and writes an XML file