Ninject.MVC3, Nuget, WebActivator oh my

Question

I want to setup Ninject to do a simple test, as well as demonstrate the ease-of-setup using Nuget. I want to resolve a sample service.

public interface ITestSer         


        

Answer 1

Steps:

1. Create a new ASP.NET MVC 3 project
2. Install the NuGet package from the Package Console: Install-Package Ninject.MVC3

3. In HomeController:

   public class HomeController : Controller
   {
       private readonly ITestService _service;
       public HomeController(ITestService service)
       {
           _service = service;
       }
   
       public ActionResult Index()
       {
           ViewBag.Message = _service.GetMessage();
           return View();
       }
   }
   

4. In App_Start/NinjectMVC3.cs:

   private static void RegisterServices(IKernel kernel)
   {
       kernel.Bind<ITestService>().To<TestService>();
   }       
   

Answer 2

Add the ITestService as a constructor parameter to your controller:

private ITestService service;

public MyController(ITestService service)
{
   this.service = service;
}

public ActionResult Index()
{
  ViewBag.Message = this.service.GetMessage();
  return View();
}

Ninject will automatically inject the ITestService into your controller. Then use the service field inside your Index method.

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Alternately, if you don't want Ninject to inject into your controller constructor, you can keep around the kernel you create, then inside your Index method, you call kernel.Get<ITestService>() to grab an instance:

public ActionResult Index()
{
  var kernel = ... // Go grab the kernel we created back in app startup.
  ITestService service = kernel.Get<ITestService>();

  ViewBag.Message = service.GetMessage();
  return View();
}

Have a look at Ninject dependency inject for controllers in MVC3.