ioc_1.cs

// Within the Application_Start() event handler in the Global.asax.cs

ControllerBuilder.Current.SetControllerFactory(new DependencyControllerFactory());

ObjectFactory.Initialize(registry => registry
        .ForRequestedType<IContactRepository>()
        .TheDefaultIsConcreteType<ContactManagerLinqRepository>());

// The repository class which is passed through DI to the controller

public class ContactManagerEntityRepository : IContactRepository
{
  public IList<Contact> GetContacts()
  {
    ContactManagerEntities entities = new ContactManagerEntities();
    return entities.ContactSet.ToList();
  }
}

// The IoC 

using System;
using System.Web.Mvc;
using StructureMap;

namespace ContactManager.IoC
{
  public class DependencyControllerFactory : DefaultControllerFactory
  {
    protected override IController GetControllerInstance(Type controllerType)
    {
        return ObjectFactory.GetInstance(controllerType) as Controller;
    }
  }
}

// The controller itself

public class ContactController : Controller
{
  private readonly IContactRepository iRepository;

  public ContactController(IContactRepository repository)
  {
    iRepository = repository;
  }

  public ActionResult Index()
  {
    return View(iRepository.GetContacts());
  }
}