AdventureWorks.WebServices.Controllers.CategoryController.GetCategories C# (CSharp) Метод

        public IEnumerable<Category> GetCategories(int parentId, int maxAmountOfProducts)
        {
            var categories = _categoryRepository.GetAll().Where(c => c.ParentId == parentId);

            var trimmedCategories = categories.Select(NewCategory).ToList();
            FillProducts(trimmedCategories);

            foreach (var trimmedCategory in trimmedCategories)
            {
                var products = trimmedCategory.Products.ToList();
                if (maxAmountOfProducts > 0)
                {
                    products = products.Take(maxAmountOfProducts).ToList();
                }
                trimmedCategory.Products = products;
            }

            return trimmedCategories;
        }