C# Xml 移除指定节点

最新推荐文章于 2023-05-15 14:30:00 发布

最新推荐文章于 2023-05-15 14:30:00 发布 · 161 阅读

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本文介绍了一个C#示例程序，演示如何通过XPath表达式查找并删除XML文档中特定属性值的节点。示例中详细展示了如何加载XML文件、定位节点、删除指定属性值的节点，并保存更改。

XML样例：<wbr><div> <pre class="prettyprint"><p></p><pre code_snippet_id="147351" snippet_file_name="blog_20140108_1_6593790" name="code" class="html"><?xml version="1.0" encoding="gb2312"?> <bookstore> <book genre="李1" ISBN="2-3645-4"> <title>Net从入门到精通</title> <author>李大蒜</author> <price>58.3</price> </book> <book genre="李2" ISBN="2-3631-4"> <title>CS从入门到精通</title> <author>候捷</author> <price>58.3</price> </book> <book genre="李3" ISBN="2-3631-4"> <title>CS从入门到精通</title> <author>候捷</author> <price>58.3</price> </book> </bookstore></pre><p></p></pre> 执行代码一：</div> <div> <pre class="prettyprint"><p></p><pre code_snippet_id="147351" snippet_file_name="blog_20140108_2_672992" name="code" class="csharp"> /// <summary> /// 删除属性值等于“AttributeValue”的节点 /// </summary> /// <param name="xmlFileName">XML文档完全文件名(包含物理路径)</param> /// <param name="xpath">要匹配的XPath表达式(例如:"//节点名//子节点名</param> /// <param name="xmlAttributeName">要删除包含xmlAttributeName属性的节点的名称</param> /// <param name="AttributeValue"></param> private void XmlNodeByXPath(string xmlFileName, string xpath, string xmlAttributeName, string AttributeValue) { XmlDocument xmlDoc = new XmlDocument(); xmlDoc.Load(xmlFileName); XmlNodeList xNodes = xmlDoc.SelectSingleNode(xpath).ChildNodes; for (int i = xNodes.Count - 1; i >= 0; i--) { XmlElement xe = (XmlElement)xNodes[i]; if (xe.GetAttribute(xmlAttributeName) == AttributeValue) { xNodes[i].ParentNode.RemoveChild(xNodes[i]); } } xmlDoc.Save(xmlFileName); }</pre><p></p></pre> 实验：XmlNodeByXPath("E:\\bookstore.xml", "bookstore", "genre", "李3");</div> <div>结果：</div> <div> <pre class="prettyprint"><p></p><pre code_snippet_id="147351" snippet_file_name="blog_20140108_3_6703257" name="code" class="html"><?xml version="1.0" encoding="gb2312"?> <bookstore> <book genre="李1" ISBN="2-3645-4"> <title>Net从入门到精通</title> <author>李大蒜</author> <price>58.3</price> </book> <book genre="李2" ISBN="2-3631-4"> <title>CS从入门到精通</title> <author>候捷</author> <price>58.3</price> </book> </bookstore></pre><p></p></pre> 小注：</div> <div> <span style="white-space:pre"></span>1、删除节点不能使用foreach，使用的话会造成删除XML一个节点，就跳出循环，也不报错，很隐蔽的错误。</div> <div> <span style="white-space:pre"></span>2、该函数也可以这么实现</div> <div> <pre class="prettyprint"><pre code_snippet_id="147351" snippet_file_name="blog_20140108_4_956400" name="code" class="csharp"> <span style="white-space:pre"> </span>/// <summary> /// 删除属性值等于“AttributeValue”的节点 /// </summary> /// <param name="xmlFileName">XML文档完全文件名(包含物理路径)</param> /// <param name="xpath">要匹配的XPath表达式(例如:"//节点名//子节点名</param> /// <param name="xmlAttributeName">要删除包含xmlAttributeName属性的节点的名称</param> /// <param name="AttributeValue"></param> private void XmlNodeByXPath(string xmlFileName, string xpath, string xmlAttributeName, string AttributeValue) { XmlDocument xmlDoc = new XmlDocument(); xmlDoc.Load(xmlFileName); XmlNode root = xmlDoc.SelectSingleNode(xpath); XmlNodeList xnl = xmlDoc.SelectSingleNode(xpath).ChildNodes; for (int i = 0; i < xnl.Count; i++) { XmlElement xe = (XmlElement)xnl.Item(i); if (xe.GetAttribute(xmlAttributeName) == AttributeValue) { root.RemoveChild(xe); if (i < xnl.Count) i = i - 1; } } xmlDoc.Save(xmlFileName); }</pre></pre> <br> </div> </wbr>