Program.cs

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using System;
using System.Linq;
using static OnlineSupermarket.OnlineSupermarket;

namespace OnlineSupermarket
{
    public static class Program
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("加载中……");
            PrepareSupermarkets(
                out OnlineSupermarket supermarket1,
                out OnlineSupermarket supermarket2);
            var cart = GetACart();
            Console.WriteLine("初始化完毕");
            Console.WriteLine("===================");

            for (; ; )
            {
                Console.WriteLine("接下来要做点什么呢？请输入序号：");
                Console.WriteLine("1. 逛超市");
                Console.WriteLine("2. 结账并退出");

                switch (Console.ReadLine())
                {
                    case "1":
                        var supermarket = ChooseSupermarket(supermarket1, supermarket2);
                        if (supermarket != null)
                            ShopIn(supermarket, cart);
                        Console.Clear();
                        break;
                    case "2":
                        if (cart.Count == 0)
                        {
                            Console.WriteLine("啊这，啥都没买！");
                            return;
                        }
                        var recipe = cart.CheckOutIn(supermarket1);
                        if (recipe == null)
                        {
                            Console.WriteLine("啊这，你买了什么奇奇怪怪的东西！");
                            return;
                        }
                        Console.WriteLine("=========收据=========");
                        foreach (var item in recipe.GoodsInfoAndWeights)
                            Console.WriteLine($"{item.Key.Name} {item.Value}×{item.Key.Price}￥");
                        Console.WriteLine($"计（不含运费和包装费）：{recipe.TotalPrice}");
                        Console.WriteLine($"运费和包装费：{recipe.FreightAndPackingFee}");
                        Console.WriteLine("======================");
                        return;
                    default:
                        Console.WriteLine("啥？再输入一次叭：");
                        break;
                }
            }
        }

        #region loading
        private static void PrepareSupermarkets(