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23.7.1 System.Xml.XPath命名空间
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23.7.1 System.Xml.XPath命名空间
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<div style='float:left;width:49%'>·<a href='100165642.htm'>23.5.3 使用XmlTextWriter类</a></div><div style='float:right;width:49%'>·<a href='100165643.htm'>23.6 在.NET中使用DOM</a></div><div style='float:left;width:49%'>·<a href='100165644.htm'>23.7 在NET中使用XPath和XSLT</a></div><div style='float:right;width:49%'>·<a href='100165646.htm'>23.7.2 System.Xml.Xsl命名空间</a></div><div style='float:left;width:49%'>·<a href='100165647.htm'>23.8 XML和ADO.NET</a></div><div style='float:right;width:49%'>·<a href='100165648.htm'>23.8.1 将ADO.NET数据转换为XML文档(1)</a></div></div>
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<link href="css.css" rel="stylesheet" type="text/css" /><h3 style="MARGIN-TOP: 8.15pt; MARGIN-LEFT: 0cm; MARGIN-RIGHT: 0cm; FTEL: 8.15pt"><span lang="EN-US">23.7.1 System.Xml.XPath</span><span style="FONT-FAMILY: 黑体">命名空间</span></h3>
<p class="MsoNormal"><span lang="EN-US">System.Xml.XPath</span><span style="FONT-FAMILY: 宋体">命名空间是建立在速度的基础上的，它提供了</span><span lang="EN-US">XML</span><span style="FONT-FAMILY: 宋体">文档的一种只读视图，但没有编辑功能。这个命名空间中的类</span><span lang="EN-US">XPath</span><span style="FONT-FAMILY: 宋体">可以采用光标的方式在</span><span lang="EN-US">XML</span><span style="FONT-FAMILY: 宋体">文档上进行快速迭代和选择操作。</span></p>
<p class="MsoNormal"><span style="FONT-FAMILY: 宋体">表</span><span lang="EN-US">23-7</span><span style="FONT-FAMILY: 宋体">列出了</span><span lang="EN-US">System.Xml.XPath</span><span style="FONT-FAMILY: 宋体">命名空间中的重要类，并对每个类的功能进行了简单的说明。</span></p>
<p class="a5" style="MARGIN-TOP: 8.15pt"><span style="FONT-FAMILY: 黑体">表</span><span lang="EN-US"> 23-7</span></p>
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<p class="a2"><a ftel="OLE_LINK6"><span style="FONT-FAMILY: 黑体">类</span><span lang="EN-US"> </span></a><span style="FONT-FAMILY: 黑体">名</span></p>
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<p class="a2"><span style="FONT-FAMILY: 黑体">说</span><span lang="EN-US"> </span><span style="FONT-FAMILY: 黑体">明</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">XpathDocument</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span style="FONT-FAMILY: 宋体">提供</span><span style="FONT-FAMILY: 宋体">整个</span><span lang="EN-US">XML</span><span style="FONT-FAMILY: 宋体">文档的视图，只读</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">XpathNavigator</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span style="FONT-FAMILY: 宋体">提供</span><span lang="EN-US">XPathDocument</span><span style="FONT-FAMILY: 宋体">的浏览功能</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">XpathNodeIterator</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span style="FONT-FAMILY: 宋体">提供节点集的迭代功能，</span><span lang="EN-US">XPath</span><span style="FONT-FAMILY: 宋体">等价于</span><span lang="EN-US">XPath</span><span style="FONT-FAMILY: 宋体">中的节点集</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">XpathExpression</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span style="FONT-FAMILY: 宋体">编译好的</span><span lang="EN-US">XPath</span><span style="FONT-FAMILY: 宋体">表达式，由</span><span lang="EN-US">SelectNodes</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">SelectSingleNodes</span><span style="FONT-FAMILY: 宋体">、</span><span lang="EN-US">Evaluate </span><span style="FONT-FAMILY: 宋体">和</span><span lang="EN-US"> Matches</span><span style="FONT-FAMILY: 宋体">使用</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">XpathException</span></p>
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<p class="a4" style="MARGIN-LEFT: 10.7pt"><span lang="EN-US">XPath</span><span style="FONT-FAMILY: 宋体">异常类</span></p>
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<p class="MsoNormal"><span lang="EN-US"> </span></p>
<h4 style="FTEL: 21.45pt"><span lang="EN-US">1. XpathDocument</span><span style="FONT-FAMILY: 黑体">类</span></h4>
<p class="MsoNormal"><span lang="EN-US">XPathDocument</span><span style="FONT-FAMILY: 宋体">没有提供</span><span lang="EN-US">XmlDocument</span><span style="FONT-FAMILY: 宋体">类的任何功能，如果需要编辑功能，就应选择</span><span lang="EN-US">XmlDocument</span><span style="FONT-FAMILY: 宋体">，如果要使用</span><span lang="EN-US">ADO.NET</span><span style="FONT-FAMILY: 宋体">，就应选择</span><span lang="EN-US">XmlDataDocument(</span><span style="FONT-FAMILY: 宋体">见本章后面的内容</span><span lang="EN-US">)</span><span style="FONT-FAMILY: 宋体">，如果速度比较重要，就应使用</span><span lang="EN-US">XPathDocument</span><span style="FONT-FAMILY: 宋体">。它有</span><span lang="EN-US">4</span><span style="FONT-FAMILY: 宋体">个重载方法，可以从文件和路径字符串、</span><span lang="EN-US">TextReader</span><span style="FONT-FAMILY: 宋体">对象、</span><span lang="EN-US">XmlReader</span><span style="FONT-FAMILY: 宋体">对象或基于</span><span lang="EN-US">Stream</span><span style="FONT-FAMILY: 宋体">的对象中打开</span><span lang="EN-US">XML</span><span style="FONT-FAMILY: 宋体">文档。</span></p>
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