C#：如何过滤XML格式的字符串

using System;
using System.Linq;
using System.Xml.Linq;

public class Program
{
    public static void Main()
    {
        string xmlString = "<root><person><name>John</name><age>30</age></person><person><name>Jane</name><age>25</age></person></root>";

        // 将XML字符串解析为XDocument对象
        XDocument xmlDoc = XDocument.Parse(xmlString);

        // 使用LINQ查询语法来过滤XML元素
        var filteredElements = from person in xmlDoc.Descendants("person")
                               where (string)person.Element("name") == "John"
                               select person;

        // 遍历过滤后的元素并输出
        foreach (var element in filteredElements)
        {
            Console.WriteLine(element);
        }
    }
}