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Detailed introduction to the code example of using XmlReader to read xml files

黄舟Original: 2017-03-21 16:59:102090browse

In .net development, it is often necessary to read and write files in the form of xml (app.config and web.config are special columns of xml files used in WinForm and WebForm respectively, and Microsoft provides Common methods, which will not be described here), .netClass Library provides a variety of ways to read and write xml files, each method has its advantages and disadvantages, and therefore has its practicality.

The following is a list of classes and their characteristics for reading and writing xml files provided by the Microsoft .net class library:

##XmlReaderFast, efficient, scalableRead-only, forward-only, manual verification requiredXmlDocument Round trip, read and write, supportSlower than XmlReaderXPathNavigator Can round trip, supports XPath and only ReadXPathDocument than XmlDocument, optimized to support XPath and XSLTSlower than XmlReaderThe XmlReader mentioned in this article is also a class in the Microsoft class library. It is characterized by being fast, efficient, and scalable. The disadvantages are Read only.

Class name	Advantages	##Disadvantages

	XPath Filtering
	XSLT

The following examples illustrate the usage of XmlReader:

(1) XML file used: meu.xml

<?xml version="1.0" encoding="utf-8" ?>
<Menus>
  <Menu title="常用网址">
    <item name="天下网" url="http://www.netskycn.com" id="1"/>
    <item name="天下网生活论坛" url="http://l
if
e.netskycn.com" id="2"/>
    <item name="csdn" url="http://www.csdn.net" id="3"/>
    <item name="我的博客" url="http://blog.csdn.net/zhoufoxcn" id="4"/>
    <item name="百度" url="http://www.baidu.com" id="5"/>
    <item name="Google" url="http://www.google.cn" id="6"/>
    <item name="微软" url="http://www.microsoft.com" id="7"/>
  </Menu>
  <Menu title="娱乐网址">
    <item name="奇虎" url="http://www.qihoo.com" id="12"/>
    <item name="网易" url="http://www.163.com" id="13"/>
    <item name="天涯" url="http://www.tianya.cn" id="14"/>
  </Menu>
  <Menu title="
安全
网址">
    <item name="360" url="http://www.safe360.com" id="15"/>
    <item name="瑞星" url="http://www.rising.com.cn" id="16"/>  
  </Menu>
</Menus>

(2) Read and display: ReadXml.aspx

<?xml version="1.0" encoding="utf-8" ?>
<Menus>
  <Menu title="常用网址">
    <item name="天下网" url="http://www.netskycn.com" id="1"/>
    <item name="天下网生活论坛" url="http://life.netskycn.com" id="2"/>
    <item name="csdn" url="http://www.csdn.net" id="3"/>
    <item name="我的博客" url="http://blog.csdn.net/zhoufoxcn" id="4"/>
    <item name="百度" url="http://www.baidu.com" id="5"/>
    <item name="Google" url="http://www.google.cn" id="6"/>
    <item name="微软" url="http://www.microsoft.com" id="7"/>
  </Menu>
  <Menu title="娱乐网址">
    <item name="奇虎" url="http://www.qihoo.com" id="12"/>
    <item name="网易" url="http://www.163.com" id="13"/>
    <item name="天涯" url="http://www.tianya.cn" id="14"/>
  </Menu>
  <Menu title="安全网址">
    <item name="360" url="http://www.safe360.com" id="15"/>
    <item name="瑞星" url="http://www.rising.com.cn" id="16"/>  
  </Menu>
</Menus>

（二）读取并显示：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">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>XMLReader实例</title>
</head>
<body>
<script runat="server">


protected void Page_Load(Object Src, EventArgs E)
{
  if (!IsPostBack) 
  {
      XmlReader xmlReader = XmlReader.Create(Server.MapPath("Menu.xml"));
            while (xmlReader.Read())
            {
                Response.Write("<li>节点类型：" + xmlReader.NodeType + "==<br>");
                switch (xmlReader.NodeType)
                {
                    case XmlNodeType.XmlDeclaration:
                        for (int i = 0; i < xmlReader.AttributeCount; i++)
                        {
                            xmlReader.MoveToAttribute(i);
                            Response.Write("属性：" + xmlReader.Name + "=" + xmlReader.Value+" ");
                        }
                        break;
                    case XmlNodeType.Attribute:
                        for (int i = 0; i < xmlReader.AttributeCount; i++)
                        {
                            xmlReader.MoveToAttribute(i);
                            Response.Write("属性：" + xmlReader.Name + "=" + xmlReader.Value+" ");
                        }
                        break;
                    case XmlNodeType.CDATA:
                        Response.Write("CDATA:" + xmlReader.Value+" ");
                        break;
                    case XmlNodeType.Element:
                        Response.Write("节点名称：" + xmlReader.LocalName+"<br>");
                        for (int i = 0; i < xmlReader.AttributeCount; i++)
                        {
                            xmlReader.MoveToAttribute(i);
                            Response.Write("属性：" + xmlReader.Name + "=" + xmlReader.Value+" ");
                        }
                        break;
                    case XmlNodeType.Comment:
                        Response.Write("Comment:" + xmlReader.Value);
                        break;
                    case XmlNodeType.Whitespace:
                        Response.Write("Whitespace:" + " ");
                        break;
                    case XmlNodeType.ProcessingInstruction:
                        Response.Write("ProcessingInstruction:" + xmlReader.Value);
                        break;
                    case XmlNodeType.Text:
                        Response.Write("Text:" + xmlReader.Value);
                        break;
                }
            }
            xmlReader.Close();
  }
}
</script>
</body>
</html>

Special instructions are: the menu.xml and ReadXml.aspx files are placed in the same folder. If the actual situation is not consistent with this, please change it according to the actual situation.

The following is the output:

节点类型：XmlDeclaration==属性：version=1.0 属性：encoding=utf-8 
节点类型：Whitespace==Whitespace: 
节点类型：Element==节点名称：Menus
节点类型：Whitespace==Whitespace: 
节点类型：Element==节点名称：Menu属性：title=常用网址 
节点类型：Whitespace==Whitespace: 
节点类型：Element==节点名称：item属性：name=天下网 属性：url=http://www.netskycn.com 属性：id=1 
节点类型：Whitespace==Whitespace: 
节点类型：Element==节点名称：item属性：name=天下网生活论坛 属性：url=http://life.netskycn.com 属性：id=2 
节点类型：Whitespace==Whitespace: 
节点类型：Element==节点名称：item属性：name=csdn 属性：url=http://www.csdn.net 属性：id=3 
节点类型：Whitespace==Whitespace: 
节点类型：Element==节点名称：item属性：name=我的博客 属性：url=http://blog.csdn.net/zhoufoxcn 属性：id=4 
节点类型：Whitespace==Whitespace: 
节点类型：Element==节点名称：item属性：name=百度 属性：url=http://www.baidu.com 属性：id=5 
节点类型：Whitespace==Whitespace: 
节点类型：Element==节点名称：item属性：name=Google 属性：url=http://www.google.cn 属性：id=6 
节点类型：Whitespace==Whitespace: 
节点类型：Element==节点名称：item属性：name=微软 属性：url=http://www.microsoft.com 属性：id=7 
节点类型：Whitespace==Whitespace: 
节点类型：EndElement==
节点类型：Whitespace==Whitespace: 
节点类型：Element==节点名称：Menu属性：title=娱乐网址 
节点类型：Whitespace==Whitespace: 
节点类型：Element==节点名称：item属性：name=奇虎 属性：url=http://www.qihoo.com 属性：id=12 
节点类型：Whitespace==Whitespace: 
节点类型：Element==节点名称：item属性：name=网易 属性：url=http://www.163.com 属性：id=13 
节点类型：Whitespace==Whitespace: 
节点类型：Element==节点名称：item属性：name=天涯 属性：url=http://www.tianya.cn 属性：id=14 
节点类型：Whitespace==Whitespace: 
节点类型：EndElement==
节点类型：Whitespace==Whitespace: 
节点类型：Element==节点名称：Menu属性：title=安全网址 
节点类型：Whitespace==Whitespace: 
节点类型：Element==节点名称：item属性：name=360 属性：url=http://www.safe360.com 属性：id=15 
节点类型：Whitespace==Whitespace: 
节点类型：Element==节点名称：item属性：name=瑞星 属性：url=http://www.rising.com.cn 属性：id=16 
节点类型：Whitespace==Whitespace: 
节点类型：EndElement==
节点类型：Whitespace==Whitespace: 
节点类型：EndElement==

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