如何使用 System.XML 在 C# 中注释 XML 文件的一行 [英] How to comment a line of a XML file in C# with System.XML

问题描述

我需要使用 System.XML 属性注释和取消注释此 XML 文件的第 4 行:

I need to comment and uncomment the 4th line of this XML file using System.XML properties:

<?xml version="1.0" encoding="utf-8"?>
    <configuration>    
        <system.web>
            <customErrors mode="On" defaultRedirect="som_url_here" />
        </system.web>
    </configuration>

所需的输出:

<!-- <customErrors mode="On" defaultRedirect="som_url_here" /> -->

是否可以在不使用文件阅读器的情况下实现这一点?

It's possible to achieve this without using a file reader?

节点:

XmlNode xmlNodoCE = docWebConfig.DocumentElement.SelectSingleNode("system.web/customErrors");

推荐答案

您需要

• 将文件加载到 XmlDocument 中，
• 检索您要评论的节点，
• 创建一个包含原始节点 XML 内容的注释节点，
• 将此注释添加到原始节点之前的原始父节点
• 将其从其父级中删除，

• 将 XmlDocument 写入文件(同一个).

• load the file into an XmlDocument,
• retrieve the node you want to comment,
• create a comment node containing the XML content of your original node,
• add this comment to the original's parent node just before the original node
• remove it from its parent,

• write the XmlDocument to a file (the same one).

String xmlFileName = "Sample.xml";

// Find the proper path to the XML file
String xmlFilePath = this.Server.MapPath(xmlFileName);

// Create an XmlDocument
System.Xml.XmlDocument xmlDocument = new System.Xml.XmlDocument();

// Load the XML file in to the document
xmlDocument.Load(xmlFilePath);

// Get the target node using XPath
System.Xml.XmlNode elementToComment = xmlDocument.SelectSingleNode("/configuration/system.web/customErrors");

// Get the XML content of the target node
String commentContents = elementToComment.OuterXml;

// Create a new comment node
// Its contents are the XML content of target node
System.Xml.XmlComment commentNode = xmlDocument.CreateComment(commentContents);

// Get a reference to the parent of the target node
System.Xml.XmlNode parentNode = elementToComment.ParentNode;

// Replace the target node with the comment
parentNode.ReplaceChild(commentNode, elementToComment);

xmlDocument.Save(xmlFilePath);

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