The implementation method for creating and reading XML files in C

1. Create a simple XML file
To facilitate testing, we will first create the console application. The project is named CreateXml, Program.cs and the code is as follows:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
namespace CreateXml
{
    class Program
    {
        static void Main(string[] args)
        {
            Program app = new Program();
            app.CreateXmlFile();          
        }
        public void CreateXmlFile()
        {
            XmlDocument xmlDoc = new XmlDocument();
            // Create a type declaration node 
            XmlNode node=xmlDoc.CreateXmlDeclaration("1.0","utf-8","");
            xmlDoc.AppendChild(node);
            // Create the root node 
            XmlNode root = xmlDoc.CreateElement("User");
            xmlDoc.AppendChild(root);
            CreateNode(xmlDoc, root, "name", "xuwei");
            CreateNode(xmlDoc, root, "sex", "male");
            CreateNode(xmlDoc, root, "age", "25");
            try
            {
                xmlDoc.Save("c://data2.xml");
            }
            catch (Exception e)
            {
                // Display error message 
                Console.WriteLine(e.Message);
            }
            //Console.ReadLine();
        }
        /// <summary>  
        ///  Create a node   
        /// </summary>  
        /// <param name="xmldoc"></param>  xml The document 
        /// <param name="parentnode"></param> The parent node   
        /// <param name="name"></param>   The node name 
        /// <param name="value"></param>   Node values 
        /// 
        public void CreateNode(XmlDocument xmlDoc,XmlNode parentNode,string name,string value)
        {
            XmlNode node = xmlDoc.CreateNode(XmlNodeType.Element, name, null);
            node.InnerText = value;
            parentNode.AppendChild(node);
        }
    }  
}

This will create the data2.xml file in the C root directory

<?xml version="1.0" encoding="utf-8"?>
<User>
  <name>xuwei</name>
  <sex>male</sex>
  <age>25</age>
</User>

2. Create multi-node, multi-level XML files
A simple change to the CreateXmlFile() method is required, as follows:

public void CreateXmlFile()
        {
            XmlDocument xmlDoc = new XmlDocument();
            // Create a type declaration node 
            XmlNode node=xmlDoc.CreateXmlDeclaration("1.0","utf-8","");
            xmlDoc.AppendChild(node);
            // Create the root node 
            XmlNode root = xmlDoc.CreateElement("Users");
            xmlDoc.AppendChild(root);

            XmlNode node1 = xmlDoc.CreateNode(XmlNodeType.Element, "User", null);
            CreateNode(xmlDoc, node1, "name", "xuwei");
            CreateNode(xmlDoc, node1, "sex", "male");
            CreateNode(xmlDoc, node1, "age", "25");
            root.AppendChild(node1);
            XmlNode node2 = xmlDoc.CreateNode(XmlNodeType.Element, "User", null);
            CreateNode(xmlDoc, node2, "name", "xiaolai");
            CreateNode(xmlDoc, node2, "sex", "female");
            CreateNode(xmlDoc, node2, "age", "23");
            root.AppendChild(node2);
            try
            {
                xmlDoc.Save("c://data5.xml");
            }
            catch (Exception e)
            {
                // Display error message 
                Console.WriteLine(e.Message);
            }
            //Console.ReadLine();
        }

The content of the generated xml file is as follows:

<?xml version="1.0" encoding="utf-8"?>
<Users>
  <User>
    <name>xuwei</name>
    <sex>male</sex>
    <age>25</age>
  </User>
  <User>
    <name>xiaolai</name>
    <sex>female</sex>
    <age>23</age>
  </User>
</Users>