Ch. 6

EssentialTools
Ninject

EssentialTools/Models/IValueCalculator.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Web;
+
+namespace EssentialTools.Models
+{
+	public interface IValueCalculator
+	{
+		decimal ValueProducts(IEnumerable<Product> products);
+	}
+}

EssentialTools/Models/LinqValueCalculator.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Web;
+
+namespace EssentialTools.Models
+{
+	public class LinqValueCalculator : IValueCalculator
+	{
+		public decimal ValueProducts(IEnumerable<Product> products)
+		{
+			return products.Sum(p => p.Price);
+		}
+	}
+}

EssentialTools/Models/Product.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Web;
+
+namespace EssentialTools.Models
+{
+	public class Product
+	{
+		public int ProductID { get; set; }
+		public string Name { get; set; }
+		public string Description { get; set; }
+		public decimal Price { get; set; }
+		public string Category { get; set; }
+	}
+}

EssentialTools/Models/ShoppingCart.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Web;
+
+namespace EssentialTools.Models
+{
+	public class ShoppingCart
+	{
+		private IValueCalculator calc;
+
+		public ShoppingCart(IValueCalculator calcParam)
+		{
+			calc = calcParam;
+		}
+
+		public IEnumerable<Product> Products { get; set; }
+
+		public decimal CalculatorProdutTotal()
+		{
+			return calc.ValueProducts(Products);
+		}
+	}
+}