从另一个列表中的列表中的对象获取最大值[C#]

using System;
using System.Collections.Generic;
using System.Linq;

public class Person
{
    public string Name { get; set; }
    public int Age { get; set; }
}

public class Program
{
    public static void Main()
    {
        // 创建一个包含多个列表的列表
        List<List<Person>> peopleLists = new List<List<Person>>
        {
            new List<Person> { new Person { Name = "Alice", Age = 30 }, new Person { Name = "Bob", Age = 25 } },
            new List<Person> { new Person { Name = "Charlie", Age = 35 }, new Person { Name = "David", Age = 28 } },
            new List<Person> { new Person { Name = "Eve", Age = 22 }, new Person { Name = "Frank", Age = 40 } }
        };

        // 使用LINQ获取最大年龄
        int maxAge = peopleLists.SelectMany(list => list) // 将所有列表合并为一个列表
                                .Max(person => person.Age); // 获取最大年龄

        Console.WriteLine($"The maximum age is: {maxAge}");
    }
}

int maxAge = peopleLists.SelectMany(list => list)
                        .Where(person => person != null) // 添加null检查
                        .Max(person => person.Age);