MVC 3 Ninjectエラー

Question

 
    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 { get; set; } 
     }
 

public interface IValueCalculator 
{ 
    decimal ValueProducts(params Product[] products); 
} 

public class LinqValueCalculator : IValueCalculator 
{ 
    private IDiscountHelper discounter; 
    public LinqValueCalculator(IDiscountHelper discountParam) 
    { 
     discounter = discountParam; 
    } 
    public decimal ValueProducts(params Product[] products) 
    { 
     return discounter.ApplyDiscount(products.Sum(p => p.Price)); 
    } 
} 

public class ShoppingCart 
{ 
    private IValueCalculator calculator; 
    public ShoppingCart(IValueCalculator calcParam) 
    { 
     calculator = calcParam; 
    } 
    public decimal CalculateStockValue() 
    { 
     Product[] products = { 
           new Product() {Name = "Kajak", Price = 275M}, 
           new Product() {Name = "Lifejacket", Price = 48.95M}, 
           new Product() {Name = "Soccer ball", Price = 19.50M}, 
           new Product() {Name = "Stadium", Price = 79500M} 
          }; 
     decimal totalValue = calculator.ValueProducts(products); 
     return totalValue; 
    } 
} 

public interface IDiscountHelper 
{ 
    decimal ApplyDiscount(decimal totalParam); 
} 
public class DefaultDiscountHelper: IDiscountHelper 
{ 
    public decimal ApplyDiscount(decimal totalParam) 
    { 
     return (totalParam - (10m/100m * totalParam)); 
    } 
} 

class Program 
{ 
    static void Main(string[] args) 
    { 
     IKernel ninjectKernel = new StandardKernel(); 
     ninjectKernel.Bind<IValueCalculator>().To<LinqValueCalculator>(); 
     ninjectKernel.Bind<IValueCalculator>().To<DefaultDiscountHelper>();//error 

     IValueCalculator calcImpl = ninjectKernel.Get<IValueCalculator>(); 
     ShoppingCart cart = new ShoppingCart(calcImpl); 
     Console.WriteLine("Total: {0:c}", cart.CalculateStockValue()); 
    } 
} 

}

ninjectKernel.Bind（）は（）; 書き込みエラー、何が問題なのでしょうか？

Answer 1

DefaultDiscountHelperは、おそらくあなたがIDiscountHelper

をバインドしたい IValueCalculator

を実装していません。