NotifierCore.Notifier.Recipe.CalculateShoppingList C# (CSharp) Метод

        private List<Recipe> CalculateShoppingList(List<Recipe> list)
        {
            if (Way == RecipeWay.Buy)
            {
                var r = list.FirstOrDefault(x => x.DataId == DataId);
                if (r == null)
                {
                    list.Add(new Recipe(this.DataId, this.Quantity, false)
                    {
                        MarketItem = this.MarketItem,
                        SellPriceCosts = this.SellPriceCosts,
                        CraftPriceCosts = this.CraftPriceCosts,
                    });
                }
                else
                {
                    r.Quantity += Quantity;
                    r.SellPriceCosts = r.Quantity * SellPrice;
                }

            }
            else
            {
                foreach (Recipe r in RecipeItems)
                {
                    r.CalculateShoppingList(list);
                }
            }

            return list;
        }