Detailed explanation of C#'s example of processing XML files

1. Basic introduction

Extensible Markup Language (English: eXtensible Markup Language, referred to as XML), is a markup language. Marking refers to information symbols that a computer can understand. Through this marking, articles containing various information can be processed between computers. How to define these tags can be either an internationally common markup language, such as HTML, or a markup language like XML that is freely decided by relevant people. This is the scalability of the language. XML is simplified from the standard universal markup language (SGML). It mainly uses extensible markup language, extensible style language (XSL), XBRL and XPath.

2. Basic operations

1. Read XML files

Read XML files using the XmlDocument class:

using ;
 
// Create XmlDocument objectXmlDocument xmlDoc = new XmlDocument();
 
// Load XML file("path/to/your/");
 
// Get the root nodeXmlNode root = ;
 
// traverse nodesforeach (XmlNode node in )
{
    ();
}

2. Create an XML file

Create an XML file using the XDocument class:

using ;
 
// Create XDocument objectXDocument xDoc = new XDocument(
    new XDeclaration("1.0", "utf-8", "yes"),
    new XElement("Root",
        new XElement("Child", "Value")
    )
);
 
// Save to file("path/to/your/");

3. Modify XML files

Modify elements in the XML file:

// Suppose you already have an XDocument object xDocXElement root = ("Root");
 
// Modify element values("Child").Value = "New Value";
 
// Add new elements(new XElement("NewChild", "New Value"));
 
// Delete elements("Child").Remove();
 
// Save and modify("path/to/your/");

4. Parsing XML files

Parses XML files and get specific information:

// Suppose you already have an XDocument object xDocXElement root = ("Root");
 
// Get the values ​​of all Child elementsforeach (var child in ("Child"))
{
    ();
}

5. Query XML using XPath

// Use XPath to queryXmlNodeList nodeList = ("//Child");
 
foreach (XmlNode node in nodeList)
{
    ();
}

3. Things to note

Make sure that the necessary namespace is introduced into the project.

When processing XML, considering the format and structure of the XML, ensure that the code can correctly access and modify XML elements.

After modifying the XML file, remember to save the changes.

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