6.1.2 Getting Started with Ninject

chap6_essential_tools_for_mvc/NinjectDemo/NinjectDemo.csproj

@@ -46,8 +46,10 @@
     <Reference Include="System.Xml" />
   </ItemGroup>
   <ItemGroup>
+    <Compile Include="Product.cs" />
     <Compile Include="Program.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="ShoppingCart.cs" />
   </ItemGroup>
   <ItemGroup>
     <None Include="App.config" />

chap6_essential_tools_for_mvc/NinjectDemo/Product.cs

@@ -0,0 +1,26 @@
+using System.Linq;
+
+namespace NinjectDemo
+{
+    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 { set; get; }
+    }
+
+    public interface IValueCalculator
+    {
+        decimal ValueProducts(params Product[] products);
+    }
+
+    public class LinqValueCalculator : IValueCalculator
+    {
+        public decimal ValueProducts(params Product[] products)
+        {
+            return products.Sum(p => p.Price);
+        }
+    }
+}

chap6_essential_tools_for_mvc/NinjectDemo/Program.cs

@@ -4,12 +4,23 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
+using Ninject;
+
 namespace NinjectDemo
 {
     class Program
     {
         static void Main(string[] args)
         {
+            IKernel ninjectKernel = new StandardKernel();
+            ninjectKernel.Bind<IValueCalculator>().To<LinqValueCalculator>();
+            
+            // get the interface implementation
+            IValueCalculator calcImp1 = ninjectKernel.Get<IValueCalculator>();
+            // create the instance of ShoppingCart and inject the dependency
+            ShoppingCart cart = new ShoppingCart(calcImp1);
+            // perform the calculation and write out the result
+            Console.WriteLine("Total: {0:c}", cart.CalculateStockValue());
         }
     }
 }

chap6_essential_tools_for_mvc/NinjectDemo/ShoppingCart.cs

@@ -0,0 +1,30 @@
+namespace NinjectDemo
+{
+    public class ShoppingCart
+    {
+        private IValueCalculator calculator;
+
+        public ShoppingCart(IValueCalculator calcParam)
+        {
+            calculator = calcParam;
+        }
+
+        public decimal CalculateStockValue()
+        {
+            // define the set of products to sum
+            Product[] products =
+            {
+                new Product() { Name = "Kayak", Price = 275M },
+                new Product() { Name = "Lifejacket", Price = 48.95M },
+                new Product() { Name = "Soccer ball", Price = 19.50M },
+                new Product() { Name = "Stadium", Price = 79500M }
+            };
+            
+            // calculate the total value of the products
+            decimal totalValue = calculator.ValueProducts(products);
+            
+            // return the result
+            return totalValue;
+        }
+    }
+}