Question

I have some problem with IoC – Unity.

I made a simple web app. It consists of one Table “Post” which have three fields: PostId, title, Text. I use generic repository:

    public abstract class BaseRepository<T> : IBaseRepository<T> where T : class
    {
        protected ObjectContext db = new BlogDbEntities();

        /* CRUD */
    }

    public class PostRepository : BaseRepository<Post>, IPostRepository
    {
        public void Search(Expression<Func<Post, object>> predicate) 
        {
          /* some search specific entity logic */   
        }
    }

    public interface IPostRepository : IBaseRepository<Post>
    {
        void Search(Expression<Func<Post, object>> predicate);
    }

int that repository as you see i create new BlogDbEntities – ObjectContext.
And in controller i use IPostRepository, controller is very simple:

public class PostController : Controller
    {

        IPostRepository postRepository;

        public PostController(IPostRepository postRepository) 
        {
            this.postRepository = postRepository;
        }


        public ActionResult Index()
        {
            postRepository.All.ToList();
            return View();
        }


        protected override void Dispose(bool disposing)
        {
            postRepository.Dispose();
            base.Dispose(disposing);
        }

    }

And in Global.asax i resolve dependencies with Unity:

 var container = new UnityContainer();
            var controllerFactory = new UnityControllerFactory(container);
            ControllerBuilder.Current.SetControllerFactory(controllerFactory);
            container.RegisterType<IPostRepository, PostRepository>(new ContainerControlledLifetimeManager());

After starting application when i do request for example /Post/ first request executed normally. But when i try to execute request again i get Exception “The ObjectContext instance has been disposed and can no longer be used for operations that require a connection.”

When i try to execute request without Unity IoC framework exception not displayed and ObjectContext work normally.

I guess that cause of that behavior is Unity, i think that context stored in Unity Container. Who can help me how to properly configure Unity with recreating context after each request.

Answer 1

Who can help me how to properly configure Unity with recreating context after each request.

When you register the type, you can specify that you want to use a TransientLifetimeManager, which causes each call to create a new instance.