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23.5 读写流格式的XML
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C#高级编程（第3版）
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23.5 读写流格式的XML
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2006-10-13 14:41:00
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<div style='float:left;width:49%'>·<a href='100165636.htm'>23.2 System.Xml命名空间</a></div><div style='float:right;width:49%'>·<a href='100165637.htm'>23.3 在.NET中使用MSXML</a></div><div style='float:left;width:49%'>·<a href='100165638.htm'>23.4 使用System.Xml类</a></div><div style='float:right;width:49%'>·<a href='100165640.htm'>23.5.1 使用 XmlTextReader类</a></div><div style='float:left;width:49%'>·<a href='100165641.htm'>23.5.2 使用XmlValidatingReader类</a></div><div style='float:right;width:49%'>·<a href='100165642.htm'>23.5.3 使用XmlTextWriter类</a></div></div>
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<link href="css.css" rel="stylesheet" type="text/css" /><h3 style="MARGIN-TOP: 11.4pt; MARGIN-LEFT: 0cm; MARGIN-RIGHT: 0cm; FTEL: 11.4pt"><a ftel="_Toc507815198"><span lang="EN-US">23.5 </span></a><span style="FONT-FAMILY: 楷体_GB2312">读写流格式的</span><span lang="EN-US">XML</span></h3>
<p class="MsoNormal"><a ftel="XMLWriter"></a><a ftel="XMLReader"><span style="FONT-FAMILY: 宋体">前面介绍了目前可以采用什么方式完成任务，下面看看</span><span lang="EN-US">.NET</span></a><span style="FONT-FAMILY: 宋体">可以完成什么任务。首先讨论如何读写</span><span lang="EN-US">XML</span><span style="FONT-FAMILY: 宋体">。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">如果您曾经使用过</span><span lang="EN-US">SAX</span><span style="FONT-FAMILY: 宋体">，就应很熟悉</span><span lang="EN-US">XmlReader </span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US"> XmlWriter</span><span style="FONT-FAMILY: 宋体">类。基于</span><span lang="EN-US">XmlReader</span><span style="FONT-FAMILY: 宋体">的类提供了一种非常迅速、只向前的只读光标来处理</span><span lang="EN-US">XML</span><span style="FONT-FAMILY: 宋体">数据。它是一个流模型，内存要求不是很高。但是，它没有提供基于</span><span lang="EN-US">DOM</span><span style="FONT-FAMILY: 宋体">模型的浏览功能和读写功能。基于</span><span lang="EN-US">XmlWriter</span><span style="FONT-FAMILY: 宋体">的类可以生成遵循</span><span lang="EN-US">W3C</span><span style="FONT-FAMILY: 宋体">的</span><span lang="EN-US"> XML 1.0 Namespace Recommendations</span><span style="FONT-FAMILY: 宋体">的</span><span lang="EN-US">XML</span><span style="FONT-FAMILY: 宋体">文档。</span></p>
<p class="MsoNormal"><span lang="EN-US" style="LETTER-SPACING: 0.1pt">XmlReader </span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.1pt">和</span><span lang="EN-US" style="LETTER-SPACING: 0.1pt"> XmlWriter</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.1pt">都是抽象类。图</span><span lang="EN-US" style="LETTER-SPACING: 0.1pt">23-2</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.1pt">列出了派生于</span><span lang="EN-US" style="LETTER-SPACING: 0.1pt">XmlReader </span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.1pt">和</span><span lang="EN-US" style="LETTER-SPACING: 0.1pt"> XmlWriter</span><span style="FONT-FAMILY: 宋体; LETTER-SPACING: 0.1pt">的类。</span></p>
<p align="center"><span lang="EN-US"><img height="254" src="23/image002.gif" width="197" border="0" alt="" /></span></p>
<p style="FTEL: 8.15pt" align="center"><span style="FONT-FAMILY: 宋体">图</span><span lang="EN-US"> 23-2</span></p>
<p class="MsoNormal"><span lang="EN-US">XmlTextReader </span><span style="FONT-FAMILY: 宋体">和</span> <span lang="EN-US">XmlTextWriter</span><span style="FONT-FAMILY: 宋体">与一个基于流的对象或是与</span><span lang="EN-US">System.IO </span><span style="FONT-FAMILY: 宋体">命名空间中的</span><span lang="EN-US">TextReader</span><span style="FONT-FAMILY: 宋体">或</span><span lang="EN-US">TextWriter</span><span style="FONT-FAMILY: 宋体">对象一起使用。</span><span lang="EN-US">XmlNodeReader</span><span style="FONT-FAMILY: 宋体">把</span><span lang="EN-US">XmlNode</span><span style="FONT-FAMILY: 宋体">作为其源，而不是一个流。</span><span lang="EN-US">XmlValidatingReader</span><span style="FONT-FAMILY: 宋体">添加了</span><span lang="EN-US">DTD</span><span style="FONT-FAMILY: 宋体">和模式验证，因此提供了数据的有效性验证。本章的后面会详细介绍这些类。</span></p></div>
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<div style='float:left;width:49%'>·<a href='100165636.htm'>23.2 System.Xml命名空间</a></div><div style='float:right;width:49%'>·<a href='100165637.htm'>23.3 在.NET中使用MSXML</a></div><div style='float:left;width:49%'>·<a href='100165638.htm'>23.4 使用System.Xml类</a></div><div style='float:right;width:49%'>·<a href='100165640.htm'>23.5.1 使用 XmlTextReader类</a></div><div style='float:left;width:49%'>·<a href='100165641.htm'>23.5.2 使用XmlValidatingReader类</a></div><div style='float:right;width:49%'>·<a href='100165642.htm'>23.5.3 使用XmlTextWriter类</a></div></div>
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