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6.1. Using Ninject

We introduced the idea of DI in Chapter 4. To recap, the idea is to decouple the components in our MVC applications, and we do this with a combination of interfaces and DI. Listing 6-1 shows an interface that expresses functionality for totaling the value of some products, as well as a concrete implementation of that interface.

Example 6.1. The Class, the Interface, and Its Implementation

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);
    }
}


  

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