C# Orders.ShoppingCartItem类代码示例

        public void Can_save_and_load_shoppingCartItem()
        {
            var sci = new ShoppingCartItem
            {
                ShoppingCartType = ShoppingCartType.ShoppingCart,
                AttributesXml = "AttributesXml 1",
                CustomerEnteredPrice = 1.1M,
                Quantity= 2,
                CreatedOnUtc = new DateTime(2010, 01, 01),
                UpdatedOnUtc = new DateTime(2010, 01, 02),
                Customer = GetTestCustomer(),
                ProductVariant = GetTestProductVariant()
            };

            var fromDb = SaveAndLoadEntity(sci);
            fromDb.ShouldNotBeNull();

            fromDb.ShoppingCartType.ShouldEqual(ShoppingCartType.ShoppingCart);
            fromDb.AttributesXml.ShouldEqual("AttributesXml 1");
            fromDb.CustomerEnteredPrice.ShouldEqual(1.1M);
            fromDb.Quantity.ShouldEqual(2);
            fromDb.CreatedOnUtc.ShouldEqual(new DateTime(2010, 01, 01));
            fromDb.UpdatedOnUtc.ShouldEqual(new DateTime(2010, 01, 02));

            fromDb.Customer.ShouldNotBeNull();

            fromDb.ProductVariant.ShouldNotBeNull();
        }

 public void Can_get_shoppingCart_totalWeight_without_attributes()
 {
     var sci1 = new ShoppingCartItem()
     {
         AttributesXml = "",
         Quantity = 3,
         Product = new Product()
         {
             Weight = 1.5M,
             Height = 2.5M,
             Length = 3.5M,
             Width = 4.5M
         }
     };
     var sci2 = new ShoppingCartItem()
     {
         AttributesXml = "",
         Quantity = 4,
         Product = new Product()
         {
             Weight = 11.5M,
             Height = 12.5M,
             Length = 13.5M,
             Width = 14.5M
         }
     };
     var cart = new List<ShoppingCartItem>() { sci1, sci2 };
     _shippingService.GetShoppingCartTotalWeight(cart).ShouldEqual(50.5M);
 }

        public void Can_get_shoppingCartItem_additional_shippingCharge()
        {
            var sci1 = new ShoppingCartItem()
            {
                AttributesXml = "",
                Quantity = 3,
                ProductVariant = new ProductVariant()
                {
                    Weight = 1.5M,
                    Height = 2.5M,
                    Length = 3.5M,
                    Width = 4.5M,
                    AdditionalShippingCharge = 5.5M,
                    IsShipEnabled = true,
                }
            };
            var sci2 = new ShoppingCartItem()
            {
                AttributesXml = "",
                Quantity = 4,
                ProductVariant = new ProductVariant()
                {
                    Weight = 11.5M,
                    Height = 12.5M,
                    Length = 13.5M,
                    Width = 14.5M,
                    AdditionalShippingCharge = 6.5M,
                    IsShipEnabled = true,
                }
            };

            //sci3 is not shippable
            var sci3 = new ShoppingCartItem()
            {
                AttributesXml = "",
                Quantity = 5,
                ProductVariant = new ProductVariant()
                {
                    Weight = 11.5M,
                    Height = 12.5M,
                    Length = 13.5M,
                    Width = 14.5M,
                    AdditionalShippingCharge = 7.5M,
                    IsShipEnabled = false,
                }
            };

            var cart = new List<ShoppingCartItem>() { sci1, sci2, sci3 };
            _shippingService.GetShoppingCartAdditionalShippingCharge(cart).ShouldEqual(42.5M);
        }

 public void Can_get_shoppingCartItem_totalWeight_without_attributes()
 {
     var sci = new ShoppingCartItem()
     {
         AttributesXml = "",
         Quantity = 3,
         Product = new Product()
         {
             Weight = 1.5M,
             Height = 2.5M,
             Length = 3.5M,
             Width = 4.5M
         }
     };
     _shippingService.GetShoppingCartItemTotalWeight(sci).ShouldEqual(4.5M);
 }

        public ProductMappingItem RetrieveFromShoppingCartItem(ShoppingCartItem shoppingCartItem)
        {
            string attributesXml = string.Empty;

            var product = _productService.GetProductById(shoppingCartItem.ProductId);

            if (product.ProductAttributeMappings != null && product.ProductAttributeMappings.Count > 0)
                attributesXml = shoppingCartItem.AttributesXml;

            if (product.ProductAttributeCombinations != null && product.ProductAttributeCombinations.Count > 0)
                attributesXml = shoppingCartItem.AttributesXml;

            if (product.ProductAttributeMappings != null && product.ProductAttributeMappings.Count > _promoSettings.MaximumAttributesForVariants)
                attributesXml = string.Empty;

            return this._repository.Table.Where(pm => pm.EntityId == product.Id && pm.EntityName == EntityAttributeName.Product &&
                (pm.AttributesXml ?? string.Empty).Equals((attributesXml ?? string.Empty), StringComparison.InvariantCultureIgnoreCase)).FirstOrDefault();
        }

        /// <summary>
        /// Add a product variant to shopping cart
        /// </summary>
        /// <param name="customer">Customer</param>
        /// <param name="productVariant">Product variant</param>
        /// <param name="shoppingCartType">Shopping cart type</param>
        /// <param name="selectedAttributes">Selected attributes</param>
        /// <param name="customerEnteredPrice">The price enter by a customer</param>
        /// <param name="quantity">Quantity</param>
        /// <param name="automaticallyAddRequiredProductVariantsIfEnabled">Automatically add required product variants if enabled</param>
        /// <returns>Warnings</returns>
        public virtual IList<string> AddToCart(Customer customer, ProductVariant productVariant, 
            ShoppingCartType shoppingCartType, string selectedAttributes,
            decimal customerEnteredPrice, int quantity, bool automaticallyAddRequiredProductVariantsIfEnabled)
        {
            if (customer == null)
                throw new ArgumentNullException("customer");

            if (productVariant == null)
                throw new ArgumentNullException("productVariant");

            var warnings = new List<string>();
            if (shoppingCartType == ShoppingCartType.ShoppingCart && !_permissionService.Authorize(StandardPermissionProvider.EnableShoppingCart, customer))
            {
                warnings.Add("Shopping cart is disabled");
                return warnings;
            }
            if (shoppingCartType == ShoppingCartType.Wishlist && !_permissionService.Authorize(StandardPermissionProvider.EnableWishlist, customer))
            {
                warnings.Add("Wishlist is disabled");
                return warnings;
            }

            if (quantity <= 0)
            {
                warnings.Add(_localizationService.GetResource("ShoppingCart.QuantityShouldPositive"));
                return warnings;
            }

            //reset checkout info
            _customerService.ResetCheckoutData(customer);

            var cart = customer.ShoppingCartItems.Where(sci=>sci.ShoppingCartType == shoppingCartType).ToList();

            var shoppingCartItem = FindShoppingCartItemInTheCart(cart,
                shoppingCartType, productVariant, selectedAttributes, customerEnteredPrice);

            if (shoppingCartItem != null)
            {
                //update existing shopping cart item
                int newQuantity = shoppingCartItem.Quantity + quantity;
                warnings.AddRange(GetShoppingCartItemWarnings(customer, shoppingCartType, productVariant,
                    selectedAttributes, customerEnteredPrice, newQuantity, automaticallyAddRequiredProductVariantsIfEnabled));

                if (warnings.Count == 0)
                {
                    shoppingCartItem.AttributesXml = selectedAttributes;
                    shoppingCartItem.Quantity = newQuantity;
                    shoppingCartItem.UpdatedOnUtc = DateTime.UtcNow;
                    _customerService.UpdateCustomer(customer);

                    //event notification
                    _eventPublisher.EntityUpdated(shoppingCartItem);
                }
            }
            else
            {
                //new shopping cart item
                warnings.AddRange(GetShoppingCartItemWarnings(customer, shoppingCartType, productVariant,
                    selectedAttributes, customerEnteredPrice, quantity, automaticallyAddRequiredProductVariantsIfEnabled));
                if (warnings.Count == 0)
                {
                    //maximum items validation
                    switch (shoppingCartType)
                    {
                        case ShoppingCartType.ShoppingCart:
                            {
                                if (cart.Count >= _shoppingCartSettings.MaximumShoppingCartItems)
                                    return warnings;
                            }
                            break;
                        case ShoppingCartType.Wishlist:
                            {
                                if (cart.Count >= _shoppingCartSettings.MaximumWishlistItems)
                                    return warnings;
                            }
                            break;
                        default:
                            break;
                    }

                    DateTime now = DateTime.UtcNow;
                    shoppingCartItem = new ShoppingCartItem()
                    {
                        ShoppingCartType = shoppingCartType,
                        ProductVariant = productVariant,
                        AttributesXml = selectedAttributes,
                        CustomerEnteredPrice = customerEnteredPrice,
                        Quantity = quantity,
                        CreatedOnUtc = now,
//.........这里部分代码省略.........

        public void Can_get_shopping_cart_total_discount()
        {
            //customer
            var customer = new Customer()
            {
                Id = 10,
            };

            //shopping cart
            var productVariant1 = new ProductVariant
            {
                Id = 1,
                Name = "Product variant name 1",
                Price = 10M,
                Published = true,
                IsShipEnabled = true,
                Product = new Product()
                {
                    Id = 1,
                    Name = "Product name 1",
                    Published = true
                }
            };
            var sci1 = new ShoppingCartItem()
            {
                ProductVariant = productVariant1,
                ProductVariantId = productVariant1.Id,
                Quantity = 2,
            };
            var productVariant2 = new ProductVariant
            {
                Id = 2,
                Name = "Product variant name 2",
                Price = 12M,
                Published = true,
                IsShipEnabled = true,
                Product = new Product()
                {
                    Id = 2,
                    Name = "Product name 2",
                    Published = true
                }
            };
            var sci2 = new ShoppingCartItem()
            {
                ProductVariant = productVariant2,
                ProductVariantId = productVariant2.Id,
                Quantity = 3
            };

            var cart = new List<ShoppingCartItem>() { sci1, sci2 };
            cart.ForEach(sci => sci.Customer = customer);
            cart.ForEach(sci => sci.CustomerId = customer.Id);

            //discounts
            var discount1 = new Discount()
            {
                Id = 1,
                Name = "Discount 1",
                DiscountType = DiscountType.AssignedToOrderTotal,
                DiscountAmount = 3,
                DiscountLimitation = DiscountLimitationType.Unlimited,
            };
            _discountService.Expect(ds => ds.IsDiscountValid(discount1, customer)).Return(true);
            _discountService.Expect(ds => ds.GetAllDiscounts(DiscountType.AssignedToOrderTotal)).Return(new List<Discount>() { discount1 });
            _discountService.Expect(ds => ds.GetAllDiscounts(DiscountType.AssignedToCategories)).Return(new List<Discount>());

            _genericAttributeService.Expect(x => x.GetAttributesForEntity(customer.Id, "Customer"))
                .Return(new List<GenericAttribute>()
                            {
                                new GenericAttribute()
                                    {
                                        StoreId = _store.Id,
                                        EntityId = customer.Id,
                                        Key = SystemCustomerAttributeNames.SelectedPaymentMethod,
                                        KeyGroup = "Customer",
                                        Value = "test1"
                                    }
                            });
            _paymentService.Expect(ps => ps.GetAdditionalHandlingFee(cart, "test1")).Return(20);

            decimal discountAmount;
            Discount appliedDiscount;
            List<AppliedGiftCard> appliedGiftCards;
            int redeemedRewardPoints;
            decimal redeemedRewardPointsAmount;

            //shipping is taxable, payment fee is taxable
            _taxSettings.ShippingIsTaxable = true;
            _taxSettings.PaymentMethodAdditionalFeeIsTaxable = true;

            //56 - items, 10 - shipping (fixed), 20 - payment fee, 8.6 - tax, [-3] - discount
            _orderTotalCalcService.GetShoppingCartTotal(cart, out discountAmount, out appliedDiscount,
                out appliedGiftCards, out redeemedRewardPoints, out redeemedRewardPointsAmount)
                .ShouldEqual(91.6M);
            discountAmount.ShouldEqual(3);
            appliedDiscount.ShouldNotBeNull();
            appliedDiscount.Name.ShouldEqual("Discount 1");
        }

        public void Can_get_shopping_cart_subTotal_discount_including_tax()
        {
            //customer
            Customer customer = new Customer();

            //shopping cart
            var productVariant1 = new ProductVariant
            {
                Id = 1,
                Name = "Product variant name 1",
                Price = 12.34M,
                CustomerEntersPrice = false,
                Published = true,
                Product = new Product()
                {
                    Id = 1,
                    Name = "Product name 1",
                    Published = true
                }
            };
            var sci1 = new ShoppingCartItem()
            {
                ProductVariant = productVariant1,
                ProductVariantId = productVariant1.Id,
                Quantity = 2,
            };
            var productVariant2 = new ProductVariant
            {
                Id = 2,
                Name = "Product variant name 2",
                Price = 21.57M,
                CustomerEntersPrice = false,
                Published = true,
                Product = new Product()
                {
                    Id = 2,
                    Name = "Product name 2",
                    Published = true
                }
            };
            var sci2 = new ShoppingCartItem()
            {
                ProductVariant = productVariant2,
                ProductVariantId = productVariant2.Id,
                Quantity = 3
            };

            var cart = new List<ShoppingCartItem>() { sci1, sci2 };
            cart.ForEach(sci => sci.Customer = customer);
            cart.ForEach(sci => sci.CustomerId = customer.Id);

            //discounts
            var discount1 = new Discount()
            {
                Id = 1,
                Name = "Discount 1",
                DiscountType = DiscountType.AssignedToOrderSubTotal,
                DiscountAmount = 3,
                DiscountLimitation = DiscountLimitationType.Unlimited,
            };
            _discountService.Expect(ds => ds.IsDiscountValid(discount1, customer)).Return(true);
            _discountService.Expect(ds => ds.GetAllDiscounts(DiscountType.AssignedToOrderSubTotal)).Return(new List<Discount>() { discount1 });
            _discountService.Expect(ds => ds.GetAllDiscounts(DiscountType.AssignedToCategories)).Return(new List<Discount>());

            decimal discountAmount;
            Discount appliedDiscount;
            decimal subTotalWithoutDiscount;
            decimal subTotalWithDiscount;
            SortedDictionary<decimal, decimal> taxRates;
            _orderTotalCalcService.GetShoppingCartSubTotal(cart, true,
                out discountAmount, out appliedDiscount,
                out subTotalWithoutDiscount, out subTotalWithDiscount, out taxRates);

            //TODO strange. Why does the commented test fail? discountAmount.ShouldEqual(3.3);
            //discountAmount.ShouldEqual(3.3);
            appliedDiscount.ShouldNotBeNull();
            appliedDiscount.Name.ShouldEqual("Discount 1");
            subTotalWithoutDiscount.ShouldEqual(98.329);
            subTotalWithDiscount.ShouldEqual(95.029);
            taxRates.Count.ShouldEqual(1);
            taxRates.ContainsKey(10).ShouldBeTrue();
            taxRates[10].ShouldEqual(8.639);
        }

        public void Can_get_shipping_total_discount_including_tax()
        {
            var sci1 = new ShoppingCartItem()
            {
                AttributesXml = "",
                Quantity = 3,
                ProductVariant = new ProductVariant()
                {
                    Id = 1,
                    Weight = 1.5M,
                    Height = 2.5M,
                    Length = 3.5M,
                    Width = 4.5M,
                    AdditionalShippingCharge = 5.5M,
                    IsShipEnabled = true,
                }
            };
            var sci2 = new ShoppingCartItem()
            {
                AttributesXml = "",
                Quantity = 4,
                ProductVariant = new ProductVariant()
                {
                    Id = 2,
                    Weight = 11.5M,
                    Height = 12.5M,
                    Length = 13.5M,
                    Width = 14.5M,
                    AdditionalShippingCharge = 6.5M,
                    IsShipEnabled = true,
                }
            };

            //sci3 is not shippable
            var sci3 = new ShoppingCartItem()
            {
                AttributesXml = "",
                Quantity = 5,
                ProductVariant = new ProductVariant()
                {
                    Id = 3,
                    Weight = 11.5M,
                    Height = 12.5M,
                    Length = 13.5M,
                    Width = 14.5M,
                    AdditionalShippingCharge = 7.5M,
                    IsShipEnabled = false,
                }
            };

            var cart = new List<ShoppingCartItem>() { sci1, sci2, sci3 };
            var customer = new Customer();
            cart.ForEach(sci => sci.Customer = customer);
            cart.ForEach(sci => sci.CustomerId = customer.Id);

            //discounts
            var discount1 = new Discount()
            {
                Id = 1,
                Name = "Discount 1",
                DiscountType = DiscountType.AssignedToShipping,
                DiscountAmount = 3,
                DiscountLimitation = DiscountLimitationType.Unlimited,
            };
            _discountService.Expect(ds => ds.IsDiscountValid(discount1, customer)).Return(true);
            _discountService.Expect(ds => ds.GetAllDiscounts(DiscountType.AssignedToShipping)).Return(new List<Discount>() { discount1 });

            decimal taxRate = decimal.Zero;
            Discount appliedDiscount = null;
            decimal? shipping = null;

            shipping = _orderTotalCalcService.GetShoppingCartShippingTotal(cart, true, out taxRate, out appliedDiscount);
            appliedDiscount.ShouldNotBeNull();
            appliedDiscount.Name.ShouldEqual("Discount 1");
            shipping.ShouldNotBeNull();
            //10 - default fixed shipping rate, 42.5 - additional shipping change, -3 - discount
            shipping.ShouldEqual(54.45);
            //10 - default fixed tax rate
            taxRate.ShouldEqual(10);
        }

        public void Shipping_should_be_free_when_customer_is_in_role_with_free_shipping()
        {
            var sci1 = new ShoppingCartItem()
            {
                AttributesXml = "",
                Quantity = 3,
                ProductVariant = new ProductVariant()
                {
                    Weight = 1.5M,
                    Height = 2.5M,
                    Length = 3.5M,
                    Width = 4.5M,
                    IsFreeShipping = false,
                    IsShipEnabled = true,
                }
            };
            var sci2 = new ShoppingCartItem()
            {
                AttributesXml = "",
                Quantity = 4,
                ProductVariant = new ProductVariant()
                {
                    Weight = 11.5M,
                    Height = 12.5M,
                    Length = 13.5M,
                    Width = 14.5M,
                    IsFreeShipping = false,
                    IsShipEnabled = true,
                }
            };
            var cart = new List<ShoppingCartItem>() { sci1, sci2 };
            var customer = new Customer();
            var customerRole1 = new CustomerRole()
            {
                Active = true,
                FreeShipping = true,
            };
            var customerRole2 = new CustomerRole()
            {
                Active = true,
                FreeShipping = false,
            };
            customer.CustomerRoles.Add(customerRole1);
            customer.CustomerRoles.Add(customerRole2);
            cart.ForEach(sci => sci.Customer = customer);
            cart.ForEach(sci => sci.CustomerId = customer.Id);

            _orderTotalCalcService.IsFreeShipping(cart).ShouldEqual(true);
        }

        /// <summary>
        /// Gets the shopping cart unit price (one item)
        /// </summary>
        /// <param name="shoppingCartItem">The shopping cart item</param>
        /// <param name="includeDiscounts">A value indicating whether include discounts or not for price computation</param>
        /// <returns>Shopping cart unit price (one item)</returns>
        public virtual decimal GetUnitPrice(ShoppingCartItem shoppingCartItem, bool includeDiscounts)
        {
            var customer = shoppingCartItem.Customer;
            decimal finalPrice = decimal.Zero;
            var productVariant = shoppingCartItem.ProductVariant;
            if (productVariant != null)
            {
                decimal attributesTotalPrice = decimal.Zero;

                var pvaValues = _productAttributeParser.ParseProductVariantAttributeValues(shoppingCartItem.AttributesXml);
                if (pvaValues != null)
                {
                    foreach (var pvaValue in pvaValues)
                    {
                        attributesTotalPrice += pvaValue.PriceAdjustment;
                    }
                }

                if (productVariant.CustomerEntersPrice)
                {
                    finalPrice = shoppingCartItem.CustomerEnteredPrice;
                }
                else
                {
                    finalPrice = GetFinalPrice(productVariant,
                        customer,
                        attributesTotalPrice,
                        includeDiscounts,
                        shoppingCartItem.Quantity);
                }
            }

            if (_shoppingCartSettings.RoundPricesDuringCalculation)
                finalPrice = Math.Round(finalPrice, 2);

            return finalPrice;
        }

        /// <summary>
        /// Get dimensions of associated products (for quantity 1)
        /// </summary>
        /// <param name="shoppingCartItem">Shopping cart item</param>
        /// <param name="width">Width</param>
        /// <param name="length">Length</param>
        /// <param name="height">Height</param>
        public virtual void GetAssociatedProductDimensions(ShoppingCartItem shoppingCartItem,
            out decimal width, out decimal length, out decimal height)
        {
            if (shoppingCartItem == null)
                throw new ArgumentNullException("shoppingCartItem");

            width = length = height = decimal.Zero;

            //attributes
            if (String.IsNullOrEmpty(shoppingCartItem.AttributesXml))
                return;

            //bundled products (associated attributes)
            var attributeValues = _productAttributeParser.ParseProductAttributeValues(shoppingCartItem.AttributesXml)
                .Where(x => x.AttributeValueType == AttributeValueType.AssociatedToProduct)
                .ToList();
            foreach (var attributeValue in attributeValues)
            {
                var associatedProduct = _productService.GetProductById(attributeValue.AssociatedProductId);
                if (associatedProduct != null && associatedProduct.IsShipEnabled)
                {
                    width += associatedProduct.Width*attributeValue.Quantity;
                    length += associatedProduct.Length * attributeValue.Quantity;
                    height += associatedProduct.Height*attributeValue.Quantity;
                }
            }
        }

        /// <summary>
        /// Gets shopping cart item weight (of one item)
        /// </summary>
        /// <param name="shoppingCartItem">Shopping cart item</param>
        /// <returns>Shopping cart item weight</returns>
        public virtual decimal GetShoppingCartItemWeight(ShoppingCartItem shoppingCartItem)
        {
            if (shoppingCartItem == null)
                throw new ArgumentNullException("shoppingCartItem");

            if (shoppingCartItem.Product == null)
                return decimal.Zero;

            //attribute weight
            decimal attributesTotalWeight = decimal.Zero;
            if (!String.IsNullOrEmpty(shoppingCartItem.AttributesXml))
            {
                var attributeValues = _productAttributeParser.ParseProductAttributeValues(shoppingCartItem.AttributesXml);
                foreach (var attributeValue in attributeValues)
                {
                    switch (attributeValue.AttributeValueType)
                    {
                        case AttributeValueType.Simple:
                        {
                            //simple attribute
                            attributesTotalWeight += attributeValue.WeightAdjustment;
                        }
                            break;
                        case AttributeValueType.AssociatedToProduct:
                        {
                            //bundled product
                            var associatedProduct = _productService.GetProductById(attributeValue.AssociatedProductId);
                            if (associatedProduct != null && associatedProduct.IsShipEnabled)
                            {
                                attributesTotalWeight += associatedProduct.Weight * attributeValue.Quantity;
                            }
                        }
                            break;
                    }
                }
            }

            var weight = shoppingCartItem.Product.Weight + attributesTotalWeight;
            return weight;
        }

        /// <summary>
        /// Gets the shopping cart item sub total
        /// </summary>
        /// <param name="shoppingCartItem">The shopping cart item</param>
        /// <param name="includeDiscounts">A value indicating whether include discounts or not for price computation</param>
        /// <param name="discountAmount">Applied discount amount</param>
        /// <param name="appliedDiscounts">Applied discounts</param>
        /// <returns>Shopping cart item sub total</returns>
        public virtual decimal GetSubTotal(ShoppingCartItem shoppingCartItem,
            bool includeDiscounts,
            out decimal discountAmount,
            out List<Discount> appliedDiscounts)
        {
            if (shoppingCartItem == null)
                throw new ArgumentNullException("shoppingCartItem");

            decimal subTotal;

            //unit price
            var unitPrice = GetUnitPrice(shoppingCartItem, includeDiscounts,
                out discountAmount, out appliedDiscounts);

            //discount
            if (appliedDiscounts.Any())
            {
                //we can properly use "MaximumDiscountedQuantity" property only for one discount (not cumulative ones)
                Discount oneAndOnlyDiscount = null;
                if (appliedDiscounts.Count == 1)
                    oneAndOnlyDiscount = appliedDiscounts.First();

                if (oneAndOnlyDiscount != null &&
                    oneAndOnlyDiscount.MaximumDiscountedQuantity.HasValue &&
                    shoppingCartItem.Quantity > oneAndOnlyDiscount.MaximumDiscountedQuantity.Value)
                {
                    //we cannot apply discount for all shopping cart items
                    var discountedQuantity = oneAndOnlyDiscount.MaximumDiscountedQuantity.Value;
                    var discountedSubTotal = unitPrice * discountedQuantity;
                    discountAmount = discountAmount * discountedQuantity;

                    var notDiscountedQuantity = shoppingCartItem.Quantity - discountedQuantity;
                    var notDiscountedUnitPrice = GetUnitPrice(shoppingCartItem, false);
                    var notDiscountedSubTotal = notDiscountedUnitPrice*notDiscountedQuantity;

                    subTotal = discountedSubTotal + notDiscountedSubTotal;
                }
                else
                {
                    //discount is applied to all items (quantity)
                    //calculate discount amount for all items
                    discountAmount = discountAmount * shoppingCartItem.Quantity;

                    subTotal = unitPrice * shoppingCartItem.Quantity;
                }
            }
            else
            {
                subTotal = unitPrice * shoppingCartItem.Quantity;
            }
            return subTotal;
        }

        /// <summary>
        /// Gets discount amount
        /// </summary>
        /// <param name="shoppingCartItem">The shopping cart item</param>
        /// <param name="appliedDiscount">Applied discount</param>
        /// <returns>Discount amount</returns>
        public virtual decimal GetDiscountAmount(ShoppingCartItem shoppingCartItem, out Discount appliedDiscount)
        {
            var customer = shoppingCartItem.Customer;
            appliedDiscount = null;
            decimal discountAmount = decimal.Zero;
            var productVariant = shoppingCartItem.ProductVariant;
            if (productVariant != null)
            {
                decimal attributesTotalPrice = decimal.Zero;

                var pvaValues = _productAttributeParser.ParseProductVariantAttributeValues(shoppingCartItem.AttributesXml);
                foreach (var pvaValue in pvaValues)
                {
                    attributesTotalPrice += pvaValue.PriceAdjustment;
                }

                decimal productVariantDiscountAmount = GetDiscountAmount(productVariant, customer, attributesTotalPrice, shoppingCartItem.Quantity, out appliedDiscount);
                discountAmount = productVariantDiscountAmount * shoppingCartItem.Quantity;
            }

            if (_shoppingCartSettings.RoundPricesDuringCalculation)
                discountAmount = Math.Round(discountAmount, 2);
            return discountAmount;
        }