Using XmlReader to read two XML files

In. NET development, it is often necessary to read and write XML files (app. Config and Web. config are a special column of the XML files used in WinForm and WebForm, and Microsoft provides a common approach, which we will not dwell on here). NET class Library provides a variety of ways to read and write XML files, each of which has its advantages and disadvantages, so it has its usefulness. The following is a list of read and write XML file classes provided by the Microsoft. NET class library and their characteristics:

Class name	Advantages	Disadvantages
XmlReader	Fast, efficient, scalable	Read only, forward only, requires manual verification
XmlDocument	Can be round-trip, read-write, and support XPath filtering	Slower than XmlReader
XPathNavigator	Roundtrip, support for XPath and XSLT	Read-only
XPathDocument	Optimized support for XPath and XSLT than XmlDocument	Slower than XmlReader

The XmlReader mentioned in this article is also a class in the Microsoft Class Library, which is characterized by fast, efficient and extensible, with the disadvantage of being read-only. The following examples illustrate the use of XmlReader:
(i) XML file used: Meu.xml

<?xml version="1.0"encoding="Utf-8"?><menus> <menu title="Common URLs"> <item name="World Network"Url="http://www.netskycn.com"Id="1"/> <item name="World Network Life Forum"Url="http://life.netskycn.com"Id="2"/> <item name="csdn"Url="http://www.csdn.net"Id="3"/> <item name="my blog"Url="HTTP://BLOG.CSDN.NET/ZHOUFOXCN"Id="4"/> <item name="Baidu"Url="http://www.baidu.com"Id="5"/> <item name="Google"Url="http://www.google.cn"Id="6"/> <item name="Microsoft"Url="http://www.microsoft.com"Id="7"/> </Menu> <menu title="Entertainment website"> <item name="Odd Tiger"Url="http://www.qihoo.com"Id=" A"/> <item name="NetEase"Url="http://www.163.com"Id=" -"/> <item name="Tianya"Url="http://www.tianya.cn"Id=" -"/> </Menu> <menu title="Secure URLs"> <item name=" the"Url="http://www.safe360.com"Id=" the"/> <item name="Rising"Url="http://www.rising.com.cn"Id=" -"/> </Menu></Menus>

(ii) Read and display: readxml.aspx

<%@ Page language="C #"Contenttype="text/html"responseencoding="gb2312"%><%@ Import namespace="System.Xml"%><! DOCTYPE HTML Public"-//W3C//DTD XHTML 1.0 transitional//en" "HTTP://WWW.W3.ORG/TR/XHTML1/DTD/XHTML1-TRANSITIONAL.DTD">"http://www.w3.org/1999/xhtml">"Content-type"Content="text/html; charset=gb2312"/><title>xmlreader instance </title>"Server">//Starting Address:http://blog.csdn.net/zhoufoxcn/archive/2007/12/23/1961624.aspxprotected voidPage_Load (Object Src, EventArgs E) {if(!IsPostBack) {XmlReader XmlReader= Xmlreader.create (Server.MapPath ("Menu.xml"));  while(Xmlreader.read ()) {Response.Write ("<li> node Type:"+ Xmlreader.nodetype +"==<br>"); Switch(xmlreader.nodetype) { Casexmlnodetype.xmldeclaration: for(inti =0; i < Xmlreader.attributecount; i++) {Xmlreader.movetoattribute (i); Response.Write ("Properties:"+ Xmlreader.name +"="+ xmlreader.value+"&nbsp;"); }                         Break;  CaseXmlnodetype.attribute: for(inti =0; i < Xmlreader.attributecount; i++) {Xmlreader.movetoattribute (i); Response.Write ("Properties:"+ Xmlreader.name +"="+ xmlreader.value+"&nbsp;"); }                         Break;  CaseXmlNodeType.CDATA:Response.Write ("CDATA:"+ xmlreader.value+"&nbsp;");  Break;  CaseXmlNodeType.Element:Response.Write ("node Name:"+ xmlreader.localname+"<br>");  for(inti =0; i < Xmlreader.attributecount; i++) {Xmlreader.movetoattribute (i); Response.Write ("Properties:"+ Xmlreader.name +"="+ xmlreader.value+"&nbsp;"); }                         Break;  CaseXmlNodeType.Comment:Response.Write ("Comment:"+xmlreader.value);  Break;  CaseXmlNodeType.Whitespace:Response.Write ("whitespace:"+"&nbsp;");  Break;  CaseXmlNodeType.ProcessingInstruction:Response.Write ("ProcessingInstruction:"+xmlreader.value);  Break;  CaseXmlNodeType.Text:Response.Write ("Text:"+xmlreader.value);  Break;  }} xmlreader.close (); }}</script></body>In particular, Menu.xml and readxml.aspx files are placed in the same folder, if the actual situation does not match, please change according to the actual situation. The following are the output results:
 
 

  
  

  
Node Type: xmldeclaration==
Property: version=1.0 Property: Encoding=utf-8
  
  

  
Node Type: whitespace==
Whitespace:
  
  

  
Node Type: element==
Node Name: Menus
  
  

  
Node Type: whitespace==
Whitespace:
  
  

  
Node Type: element==
Node Name: Menu
Properties: title= Common URLs
  
  

  
Node Type: whitespace==
Whitespace:
  
  

  
Node Type: element==
Node Name: item
Properties: Name= World Net Properties: Url=http://www.netskycn.com Properties: id=1
  
  

  
Node Type: whitespace==
Whitespace:
  
  

  
Node Type: element==
Node Name: item
Properties: Name= World Network Life Forum Properties: Url=http://life.netskycn.com Properties: id=2
  
  

  
Node Type: whitespace==
Whitespace:
  
  

  
Node Type: element==
Node Name: item
Property: Name=csdn Property: Url=http://www.csdn.net Property: id=3
  
  

  
Node Type: whitespace==
Whitespace:
  
  

  
Node Type: element==
Node Name: item
Properties: Name= My Blog properties: URL=HTTP://BLOG.CSDN.NET/ZHOUFOXCN properties: id=4
  
  

  
Node Type: whitespace==
Whitespace:
  
  

  
Node Type: element==
Node Name: item
Property: Name= Baidu Properties: Url=http://www.baidu.com Property: id=5
  
  

  
Node Type: whitespace==
Whitespace:
  
  

  
Node Type: element==
Node Name: item
Property: Name=google Property: url=http://www.google.cn Property: id=6
  
  

  
Node Type: whitespace==
Whitespace:
  
  

  
Node Type: element==
Node Name: item
Property: Name= Microsoft Properties: Url=http://www.microsoft.com Properties: id=7
  
  

  
Node Type: whitespace==
Whitespace:
  
  

  
Node Type: endelement==
  
  

  
Node Type: whitespace==
Whitespace:
  
  

  
Node Type: element==
Node Name: Menu
Properties: title= Entertainment URL
  
  

  
Node Type: whitespace==
Whitespace:
  
  

  
Node Type: element==
Node Name: item
Properties: Name= Qihoo Properties: url=http://www.qihoo.com Properties: id=12
  
  

  
Node Type: whitespace==
Whitespace:
  
  

  
Node Type: element==
Node Name: item
Property: Name= NetEase Properties: url=http://www.163.com Properties: id=13
  
  

  
Node Type: whitespace==
Whitespace:
  
  

  
Node Type: element==
Node Name: item
Properties: Name= Tianya Properties: url=http://www.tianya.cn Properties: id=14
  
  

  
Node Type: whitespace==
Whitespace:
  
  

  
Node Type: endelement==
  
  

  
Node Type: whitespace==
Whitespace:
  
  

  
Node Type: element==
Node Name: Menu
Properties: title= Security URL
  
  

  
Node Type: whitespace==
Whitespace:
  
  

  
Node Type: element==
Node Name: item
Property: Name=360 Property: Url=http://www.safe360.com Property: id=15
  
  

  
Node Type: whitespace==
Whitespace:
  
  

  
Node Type: element==
Node Name: item
Property: Name= Rising property: url=http://www.rising.com.cn Property: id=16
  
  

  
Node Type: whitespace==
Whitespace:
  
  

  
Node Type: endelement==
  
  

  
Node Type: whitespace==
Whitespace:
  
  

  
Node Type: endelement==
 
 
Using XmlReader to read two XML files