如何使用c#从标记之间检索数据？

using System;
using System.Xml;

public class Program
{
    public static void Main()
    {
        // XML文档字符串
        string xmlString = "<root><person><name>John</name><age>30</age></person></root>";

        // 创建XML文档对象
        XmlDocument xmlDoc = new XmlDocument();
        xmlDoc.LoadXml(xmlString);

        // 获取根节点
        XmlNode root = xmlDoc.DocumentElement;

        // 获取person节点
        XmlNode personNode = root.SelectSingleNode("person");

        // 获取name节点的值
        string name = personNode.SelectSingleNode("name").InnerText;
        Console.WriteLine("Name: " + name);

        // 获取age节点的值
        string age = personNode.SelectSingleNode("age").InnerText;
        Console.WriteLine("Age: " + age);
    }
}