lambda表达式嵌套

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleTest
{
    class Program
    {
        static void Main(string[] args)
        {
            var personList = new List<Person>()
            {
                new Person() {Name="YC1",Age=22,Sex="男" },
                new Person() {Name="YC2",Age=23,Sex="女" },
                new Person() {Name="YC3",Age=24,Sex="男" },
                new Person() {Name="YC4",Age=25,Sex="女" },
                new Person() {Name="YC5",Age=26,Sex="?" },
                new Person() {Name="YC6",Age=27,Sex="女" },
                new Person() {Name="YC7",Age=28,Sex="男" },
                new Person() {Name="YC8",Age=29,Sex="女" },
                new Person() {Name="YC9",Age=30,Sex="男" },
                new Person() {Name="YC10",Age=31,Sex="女" }
            };

            var list = personList.Where(d => d.Age.Equals(personList.Where(e => e.Sex == "?").Max(e => e.Age))).ToList();

            foreach (var v in list)
            {
                Console.WriteLine(v.Name + "--" + v.Age + "--" + v.Sex);
            }

            Console.ReadLine();
        }
    }
}

输出了sex="?"的那一行数据