C#面向对象 1

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

namespace ConsoleApplication2
{
    class Program
    {
        public ArrayList paixu(ArrayList arr)
        {
            for (int i = ; i < arr.Count - ; i++)
            {
                for (int j = i + ; j < arr.Count; j++)
                {
                    if (((student)arr[i]).degree < ((student)arr[j]).degree)
                    {
                        student n = (student)arr[i];
                        arr[i] = arr[j];//存在集合中的数据类型，电脑默认为object类型，所以当定义一个student类型 的n的变量作为接收
                                        //容器时，必须要将集合里面的类型转化成student类型，才能接收。
                        arr[j] = n;
                    }
                }
            }
            return arr;
        }

        static void Main(string[] args)
        {
            Console.Write("请输入人数");
            int renshu = int.Parse(Console.ReadLine());
            ArrayList arr = new ArrayList();
            for (int i = ; i < renshu ; i++)
            {
                student s = new student();
                Console.Write("请输入序号：");
                s.code = int.Parse(Console.ReadLine());
                Console.Write("请输入姓名");
                s.name = Console.ReadLine();
                Console.Write("请输入分数");
                s.degree = double.Parse(Console.ReadLine());
                arr.Add(s);
            }

            arr = new Program().paixu(arr);

            foreach (student s in arr)//遍历集合arr中数据类型为student 的s
            {
                Console.Write(s.code + " " + s.name + " " + s.degree);
                Console.WriteLine();
            }

                Console.ReadLine();
        }
    }
}

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

namespace ConsoleApplication2
{
    class student
    {
        public int code;
        public string name;
        public double degree;
    }
}