oop_internet-shop/internet_shop/Program.cs

class Goods
{
    public string Name { get;set; }
    public int Price { get; set; }
    public int Amount { get; set; }
    public string category { get; set; }
    public Goods(string name, int price, int amount, string category)
    {
        Name = name;
        Price = price;
        Amount = amount;
        this.category = category;
    }
}
class Category
{
    public string Title { get; set; }
    public Category(string title)
    {
        Title = title;
    }
}

class Seller
{
    public string Name { get; set; }
    public int Reviews { get; set; }
    public List<Goods> GoodsList;
    public Seller(string name, int reviews, List<Goods> goodsList)
    {
        Name = name;
        Reviews = reviews;
        GoodsList = goodsList;
    }

}

class Program
{
    static void Main(string[] args)
    {
        List<Category> categories = new List<Category>()
        {
            new Category("Brawl"),
            new Category("Roblox"),
            new Category("Mine"),
            new Category("Pubg")
        };
        List<Goods> goods = new List<Goods>()
        {
            new Goods("Gems", 100, 37,categories[0].Title),
            new Goods("Robux", 200, 5,categories[1].Title),
            new Goods("Robux", 300, 25,categories[1].Title),
            new Goods("Robux", 100, 50,categories[1].Title),
            new Goods("Acc", 2000, 3,categories[2].Title)
        };
        List<Seller> sellers = new List<Seller>()
        {
            new Seller("TopSell", 111, new List<Goods>() {goods[0], goods[2]}),
            new Seller("GameDealer", 222, new List<Goods>() {goods[1]}),
            new Seller("CANE2280", 3178, new List<Goods>() {goods[3]}),
            new Seller("SashaB116", 666, new List<Goods>() {goods[4]})
            
        };

        List<Tuple<string, string, int, int, string, int>> data =
            new List<Tuple<string, string, int, int, string, int>>();
        foreach (var sel in sellers)
        {
            foreach (var selGod in sel.GoodsList)
            {
                data.Add(new Tuple<string, string, int, int, string, int>(selGod.category, selGod.Name, selGod.Amount, selGod.Price, sel.Name, sel.Reviews));
            }
        }

        while (true)
        {
            Console.Write("Выберите метод сортировки:\n1. По убыванию\n2. По возрастанию\n>>> ");
            int ch0 = Convert.ToInt32(Console.ReadLine());
            Console.Write(
                "Выберите метод сортировки:\n1. По категории\n2. По количеству\n3. По цене\n4. По отзывам\n>>> ");
            int ch = Convert.ToInt32(Console.ReadLine());
            IOrderedEnumerable<Tuple<string, string, int, int, string, int>> filData = null;
            switch (ch)
            {
                case 1:
                    if (ch0 == 2) filData = data.OrderBy(d => d.Item1);
                    else filData = data.OrderByDescending(d => d.Item1);
                    break;
                case 2:
                    if (ch0 == 2) filData = data.OrderBy(d => d.Item3);
                    else filData = data.OrderByDescending(d => d.Item3);
                    break;
                case 3:
                    if (ch0 == 2) filData = data.OrderBy(d => d.Item4);
                    else filData = data.OrderByDescending(d => d.Item4);
                    break;
                case 4:
                    if (ch0 == 2) filData = data.OrderBy(d => d.Item6);
                    else filData = data.OrderByDescending(d => d.Item6);
                    break;
            }
            Console.WriteLine("Категор  Предмет Кол-во  Цена    Продавец       Отзывы");
            foreach (var i in filData)
            {
                Console.WriteLine($"{i.Item1}\t {i.Item2}\t {i.Item3}\t {i.Item4}\t {i.Item5}\t {i.Item6}");
            }
        }
    }
}