C# Linq Group By 多个字段并返回给实体类List

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

namespace study
{
    class LinqGroup
    {
        static void Main(string[] args)
        {
            List<Employee> empList = new List<Employee>  
            {  
               new Employee {ID = 1, FName = "John", Age = 23, Sex = 'M', Money=100},  
               new Employee {ID = 2, FName = "Mary", Age = 25, Sex = 'F', Money=200},  
               new Employee {ID = 3, FName = "Amber", Age = 23, Sex = 'M', Money=300},  
               new Employee {ID = 4, FName = "Kathy", Age = 25, Sex = 'F', Money=400},  
               new Employee {ID = 5, FName = "Lena", Age = 27, Sex = 'F', Money=500},  
               new Employee {ID = 6, FName = "Bill", Age = 28, Sex = 'M', Money=600},  
               new Employee {ID = 7, FName = "Celina", Age = 27, Sex = 'F', Money=700},  
               new Employee {ID = 8, FName = "John", Age = 28, Sex = 'M', Money=800}   
            };

            List<Employee> empGroupByList = (from a in empList
                                             group a by new
                                             {
                                                 a.FName,
                                                 a.Sex
                                             } into b
                                             orderby b.Key.FName, b.Key.Sex
                                             select new Employee
                                             {
                                                 FName = b.Key.FName,
                                                 Sex=b.Key.Sex,
                                                 Age = b.Sum(c => c.Age),
                                                 ID = b.Max(c => c.ID),
                                                 Money = b.Average(c => c.Money)
                                             }).ToList<Employee>();
            foreach (var item in empGroupByList)
            {
                Console.WriteLine("item.ID = " + item.ID);
                Console.WriteLine("item.FName = " + item.FName);
                Console.WriteLine("item.Age = " + item.Age);
                Console.WriteLine("item.Sex = " + item.Sex);
                Console.WriteLine("item.Money = " + item.Money);
                Console.WriteLine("------------------------");
            }

            Console.ReadKey();
        }
    }

    public class Employee
    {
        public int ID { get; set; }
        public string FName { get; set; }
        public int Age { get; set; }
        public char Sex { get; set; }
        public decimal Money { get; set; }
    }
}