using System;
using System.Collections.Generic;
using System.Text;
using System.Linq;
namespace ConsoleApp1
{
    class Student {
        public string name;
        public uint score;
    }
    class ClassRoom {
        public List<Student> students = new List<Student>();

        //定義索引
        public List<Student> this[uint score] {
            get {
                return students.Where(o => o.score == score).ToList();
            }

        }


    }

}