MVC Implementing Dependency Injection.

Please follow the following steps to implement the dependency injection in the MVC.

Step1:- Install "Unity.MVC4" Nuget Package.

Step2:- Map interfaces with classes as followimg

 

private static IUnityContainer BuildUnityContainer()

       {

           var container = new UnityContainer();

           // register all your components with the container here

           // it is NOT necessary to register your controllers

           // e.g. container.RegisterType<ITestService, TestService>();  

           container.RegisterType<IUser, UserComponent>();

           container.RegisterType<IService, ServiceComponent>();

           RegisterTypes(container);

           return container;

       }

Step3:- In global.ajax file set Bootstrapper.Initialise() function.

protected void Application_Start()

       {

          Bootstrapper.Initialise();

       }

Step5:- Start inject constructor of controller as following:-

public class HomeController : Controller {

IUser UserComponent = null;

IService ServiceComponent = null;

public HomeController(IUser userComponent, IService serviceComponent)

       {

           if (userComponent == null)

           {

               throw new ArgumentNullException();

           }

           this.UserComponent = userComponent;

           if (serviceComponent == null)

           {

               throw new ArgumentNullException();

           }

           this.ServiceComponent = serviceComponent;

       }
}