Seller[] products = { new Product(1,"Яблоки"), new Product(2, "Груши"), new Product(3, "Бананы"), new Product(4, "Виноград") };
            Player[] bag = new Player[0];
            bool isOpen = true;
            int userInput;

            while (isOpen)
            {
                Console.WriteLine("Меню:");
                Console.WriteLine("1 - Узнать список продуктов\n2 - Купить товар\n3 - Посмотреть свою сумку\n4 - Выход");
                userInput = Convert.ToInt32(Console.ReadLine());

                switch (userInput)
                {
                    case 1:
                        for (int i = 0; i < products.Length; i++)
                        {
                            products[i].ProductListShow();
                        }
                        break;
                    case 2:
                        for (int i = 0; ;)
                        {
                            bag[i].BuyToProduct(ref bag);
                            break;
                        }
                        break;
                    case 3:
                        for (int i = 0; i < bag.Length; i++)
                        {
                            bag[i].BagShow();
                            break;
                        }
                        break;
                    case 4:
                        isOpen = false;
                        Console.WriteLine("До свидания");
                        break;
                }
            }
        }
    }

    class Seller
    {
        private string _name;
        private int _number;
        public Seller(int number, string name)
        {
            _number = number;
            _name = name;
        }
        public void ProductListShow()
        {
            Console.WriteLine($"{_number}){_name}.");
        }
    }
    class Product : Seller
    {
        public Product(int number,string name) : base (number, name)
        {
        }
    }

    class Player : Seller
    {
        public Player(int number, string name) : base(number, name)
        {
        }

        public void BuyToProduct(ref Player[] bag,Product[] products)
        {
            Player[] tempProducts = new Player[bag.Length + 1];
            for (int i = 0; i < bag.Length; i++)
            {
                tempProducts[i] = bag[i];
            }
            Console.WriteLine("Введите какой продукт вы хотите купить?");
            int index = Convert.ToInt32(Console.ReadLine());
        }

        public void BagShow()
        {
            Console.WriteLine($"номер)имя.");
        }
    }