8.2.1 Defining the Cart Entity; Listing 8-12 The Cart and CartLine Classes in the Cart.cs File

SportsStore/SportsStore.Domain/Entities/Cart.cs

@@ -0,0 +1,54 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SportsStore.Domain.Entities
+{
+    class Cart
+    {
+        private List<CartLine> lineCollection = new List<CartLine>();
+
+        public void AddItem(Product product, int quantity)
+        {
+            CartLine line = lineCollection
+                .Where(p => p.Product.ProductID == product.ProductID)
+                .FirstOrDefault();
+
+            if (line == null)
+            {
+                lineCollection.Add(new CartLine
+                {
+                    Product = product,
+                    Quantity = quantity
+                });
+            }
+            else
+            {
+                line.Quantity += quantity;
+            }
+        }
+
+        public void RemoveLine(Product product)
+        {
+            lineCollection.RemoveAll(l => l.Product.ProductID == product.ProductID);
+        }
+
+        public void Clear()
+        {
+            lineCollection.Clear();
+        }
+
+        public IEnumerable<CartLine> Lines
+        {
+            get { return lineCollection; }
+        }
+    }
+
+    public class CartLine
+    {
+        public Product Product { get; set; }
+        public int Quantity { get; set; }
+    }
+}

SportsStore/SportsStore.Domain/SportsStore.Domain.csproj

@@ -75,6 +75,7 @@
     <Compile Include="Abstract\IProductRepository.cs" />
     <Compile Include="Concrete\EFDbContext.cs" />
     <Compile Include="Concrete\EFProductRepository.cs" />
+    <Compile Include="Entities\Cart.cs" />
     <Compile Include="Entities\Product.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
   </ItemGroup>