最后main里面应该怎么写？感觉前面应该也是错的，

Question

创建4个类，分别是：饮品父类(Drink)、 子类可乐类(Cola)、 子类咖啡类
(Coffee)、子类奶茶类(Milk)。
父类Drink包含了饮品名称name、饮品价格price、饮品大小size、购买数量num、备注remark五个字段（其中remark用于备注是否加糖加冰等）；另外还包含两个构造函数：无参构造和有参构造，有参构造中给各个字段赋值；还包含一个成员方法show()用于展示订单信息。
四个子类中分别都只包含一个无参构造和一个有参构造，有参构造中调用父类有参构造给字段赋值。
在main方法中尝试购买各种饮品，并输出购买的订单信息。

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

namespace 饮品类
{
class Program
{public class Drink
{
public string name;
public int price;
public string size;
public int num;
public string remark;
public Drink()
{

        }
        public Drink (string name,int price,string size,int num,string remark)
        {
            this.name = name;
            this.price = price;
            this.size = size;
            this.num = num;
            this.remark = remark;
        }
        public void show()
        {
            Console.WriteLine("订单信息-----\n 购买饮料{0},花费{1}，大小{2}，数量{3}，备注{4} ", name, price, size, num, remark);
        }
    }
    public string name
    {
        get { return name; }
        set { name = value; }
    }
    public int price
    {
        get { return price; }
        set { price = value; }
    }
    public string size
    {
        get { return size; }
        set { size = value; }
    }
    public int num
    {
        get { return num; }
        set { num = value; }
    }
    public string remark
    {
        get { return remark; }
        set { remark = value; }
    }
    public class cola:Drink
    {
        public cola()
        {

        }
        public cola(string name, int price, string size, int num, string remark)
        : base(name, price, size, num, remark) { }
        public void show()
        {
            Console.WriteLine("订单信息-----\n 购买饮料{0},花费{1}，大小{2}，数量{3}，备注{4} ", name, price, size, num, remark);
        }
    }
    public class Coffee:Drink
    {
        public Coffee() { }
        public Coffee (string name, int price, string size, int num, string remark)
            :base(name, price, size, num, remark) { }
        public void show()
        {
            Console.WriteLine("订单信息-----\n 购买饮料{0},花费{1}，大小{2}，数量{3}，备注{4} ", name, price, size, num, remark);
        }
    }
    public class Milk : Drink
    {
        public Milk () { }
        public Milk (string name, int price, string size, int num, string remark)
            : base(name, price, size, num, remark) { }
        public void show()
        {
            Console.WriteLine("订单信息-----\n 购买饮料{0},花费{1}，大小{2}，数量{3}，备注{4} ", name, price, size, num, remark);
        }
    }
    static void Main(string[] args)
    {
        Console.WriteLine("购买饮料 1、可乐 2、咖啡 3、奶茶");
        int choice = Convert.ToInt32(Console.ReadLine());
        switch (choice)
        {
            case 1:
                cola co = new cola();
                co.name = "可乐";
                int beizi = Convert.ToInt32(Console.ReadLine());
                switch (beizi)
                {
                    case 1:
                }
        }
    }
}

}

Answer 1

给你稍微改了一下，稍微这哈哈哈，大概实现效果是这样的，每个人有每个的风格，参考一下，并不一定是最好的写法。

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

namespace 饮品类
{
    class Program
    {
        public class Drink
        {
            public string name;
            public int price;
            public string size;
            public int num;
            public string remark;
            public Drink()
            {

            }
            public Drink(string size, int num, string remark)
            {
                this.size = size;
                this.num = num;
                this.remark = remark;
            }
            public void show()
            {
                Console.WriteLine("订单信息-----\n 购买饮料{0},花费:{1}，大小:{2}，数量:{3}，备注:{4} ", name, price, size, num, remark);
            }
        }
        public class Cola : Drink
        {
            public Cola()
            {

            }
            public Cola(string size, int num, string remark)
            : base(size, num, remark)
            {
                this.name = "可乐";
                this.price = (size == "中" ? 4 : size == "大" ? 6 : 8) * num;
            }
        }
        public class Coffee : Drink
        {
            public Coffee() { }
            public Coffee(string size, int num, string remark)
                : base(size, num, remark)
            {
                this.name = "咖啡";
                this.price = (size == "中" ? 15 : size == "大" ? 19 : 24) * num;
            }
        }
        public class Milk : Drink
        {
            public Milk() { }
            public Milk(string size, int num, string remark)
                : base(size, num, remark)
            {
                // 奶茶不是Milk
                this.name = "奶茶";
                this.price = (size == "中" ? 12 : size == "大" ? 14 : 18) * num;
            }
        }
        static void Main(string[] args)
        {

            // 声明饮料单
            var drinkList = new string[] { "可乐", "咖啡", "奶茶" };
            var sizeList = new string[] { "中", "大", "特大" };

            Console.Write("选择购买饮料");
            for (int i = 0; i < drinkList.Length; i++)
            {
                Console.Write(i + 1 + "、" + drinkList[i] + " ");
            }
            Console.WriteLine();
            int drinkChoice = Convert.ToInt32(Console.ReadLine());
            Console.Write("选择饮料大小");
            for (int i = 0; i < sizeList.Length; i++)
            {
                Console.Write(i + 1 + "、" + sizeList[i] + " ");
            }
            Console.WriteLine();
            int sizeChoice = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("输入购买数量");
            int num = Convert.ToInt32(Console.ReadLine());
            Console.WriteLine("输入备注");
            string remark = Console.ReadLine();

            if (drinkChoice == 1) new Cola(sizeList[sizeChoice - 1], num, remark).show();
            else if (drinkChoice == 2) new Coffee(sizeList[sizeChoice - 1], num, remark).show();
            else if (drinkChoice == 3) new Milk(sizeList[sizeChoice - 1], num, remark).show();

        }
    }
}