C# 匿名类型 分组 求和

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

namespace ConsoleApplication8
{
    class pr
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public string Name2 { get; set; }
    }
    class Program
    {
        static void Main(string[] args)
        {
            List<pr> prarr = new List<pr> {
                , Name = "A" },
                , Name = "B" },
                , Name = "C" },
                , Name = "D" },
                , Name = "D" },
            };
            var lista_ = prarr.Select(a => new { a.Id, a.Name });
            var sdsds = lista_.GroupBy(a => a.Name).Select(G => new
            {
                G.Key,
                ID = G.Sum(item => item.Id)
            });
            Console.WriteLine();

            //var list1 = new { Id = 1, Name = "asd1" };
            //var list2 = new { Id = 2, Name = "asd2" };
            //var list3 = new { Id = 3, Name = "asd3" };
            //var list4 = new { Id = 4, Name = "asd4" };
            //var list5 = new { Id = 4, Name = "asd4" };

            //var list = new {new
            //                { Id = 1, Name = "asd1" } ,
            //               new { Id = 2, Name = "asd2" },
            //               new { Id = 3, Name = "asd3" },
            //              new  { Id = 4, Name = "asd4" },
            //                new { Id = 4, Name = "asd4" }
            //           };

        }
    }
}