Proper Dependency Injection In MVC

Controller code

public class ThreadController : Controller
{
	private ThreadViewModelBuilder _builder = null;
	public ThreadController(ThreadViewModelBuilder builder)
	{
		_builder = builder;
	}
	//
	// GET: /Threads/Thread/

	public ActionResult Index()
	{
		List<Thread> model = _builder.GetAllThreads();
		return View(model);
	}

}

ViewModelBuilder code

public class ThreadViewModelBuilder
{
	protected readonly IThreadBusiness iThreadBusiness;
	public ThreadViewModelBuilder(IThreadBusiness iThreadBusiness)
	{
		this.iThreadBusiness = iThreadBusiness;
	}

	public List<Thread> GetAllThreads()
	{
		List<Thread> threads = iThreadBusiness.GetThreads();
		return threads;
	}
}

Business implementation code

public class ThreadBusiness : IThreadBusiness
{
	IThreadRepository iThreadRepository = null;
	public ThreadBusiness(IThreadRepository iThreadRepository)
	{
		this.iThreadRepository = iThreadRepository;
	}

	public List<Thread> GetThreads()
	{
		return iThreadRepository.GetThreads().ToList();
	}
}

Repository implementation code

public class ThreadRepository : IThreadRepository
{
	private IssuesEntities context;
	public ThreadRepository()
	{
		this.context = new IssuesEntities();
	}

	public IQueryable<Thread> GetThreads()
	{
		return (from threads in context.Thread 
				select threads);
	}
}

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