关于Linq on XML的问题，至少有一个对象必须实现IComparable

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

// 定义一个Person类，实现IComparable接口
class Person : IComparable<Person>
{
    public string Name { get; set; }
    public int Age { get; set; }

    public int CompareTo(Person other)
    {
        // 比较两个Person对象的年龄
        return this.Age.CompareTo(other.Age);
    }
}

class Program
{
    static void Main()
    {
        // 加载XML文档
        XDocument doc = XDocument.Load("data.xml");

        // 使用Linq on XML进行查询和排序
        var query = from person in doc.Descendants("Person")
                    let name = person.Element("Name").Value
                    let age = int.Parse(person.Element("Age").Value)
                    orderby age
                    select new Person { Name = name, Age = age };

        // 输出查询结果
        foreach (var person in query)
        {
            Console.WriteLine("Name: {0}, Age: {1}", person.Name, person.Age);
        }
    }
}