Session variables between controllers and action methods

Question

I have almost the same scenario described by Nathon Taylor in ASP.NET MVC - sharing session state between controllers . The problem is that if I save the path to the images inside the session variable List<string>, it will not be defined in the ItemController, so all the paths will be lost ... Here is my setting:

Inside ImageController I have a Upload () action method:

    public ActionResult Upload()
    {
        var newFile = System.Web.HttpContext.Current.Request.Files["Filedata"];
        string guid = Guid.NewGuid() + newFile.FileName;
        string itemImagesFolder = Server.MapPath(Url.Content("~/Content/ItemImages/"));
        string fileName = itemImagesFolder + "originals/" + guid;
        newFile.SaveAs(fileName);

        var resizePath = itemImagesFolder + "temp/";
        string finalPath;
        foreach (var dim in _dimensions)
        {
            var resizedPath = _imageService.ResizeImage(fileName, resizePath, dim.Width + (dim.Width * 10/100), guid);
            var bytes = _imageService.CropImage(resizedPath, dim.Width, dim.Height, 0, 0);
            finalPath = itemImagesFolder + dim.Title + "/" + guid;
            _imageService.SaveImage(bytes, finalPath);
        }
        AddToSession(guid);
        var returnPath = Url.Content("~/Content/ItemImages/150x150/" + guid);
        return Content(returnPath);
    }

    private void AddToSession(string fileName)
    {
        if(Session[SessionKeys.Images] == null)
        {
            var imageList = new List<string>();
            Session[SessionKeys.Images] = imageList;
        }
        ((List<string>)Session[SessionKeys.Images]).Add(fileName);
    }

Then inside my ItemController, I have a New () action method that has the following code:

        List<string> imageNames;
        var images = new List<Image>();
        if (Session[SessionKeys.Images] != null) //always returns false
        {
            imageNames = Session[SessionKeys.Images] as List<string>;
            int rank = 1;
            foreach (var name in imageNames)
            {
                var img = new Image {Name = name, Rank = rank};
                images.Add(img);
                rank++;
            }
        }

Okay, so why is this happening and how can I solve it?

, , ActionMethod, ItemController List ItemController, ? , AJAX. , , ...

Update:

. , StructureMap . ? , StructureMap?

public class StructureMapDependencyResolver : IDependencyResolver
{
    public StructureMapDependencyResolver(IContainer container)
    {
        _container = container;
    }

    public object GetService(Type serviceType)
    {
        if (serviceType.IsAbstract || serviceType.IsInterface)
        {
            return _container.TryGetInstance(serviceType);
        }
        else
        {
            return _container.GetInstance(serviceType);
        }
    }

    public IEnumerable<object> GetServices(Type serviceType)
    {
        return _container.GetAllInstances<object>()

            .Where(s => s.GetType() == serviceType);
    }

    private readonly IContainer _container;
}

Global.asax:

    private static IContainer ConfigureStructureMap()
    {
        ObjectFactory.Configure(x =>
        {
            x.For<IDatabaseFactory>().Use<EfDatabaseFactory>();
            x.For<IUnitOfWork>().Use<UnitOfWork>();
            x.For<IGenericMethodsRepository>().Use<GenericMethodsRepository>();
            x.For<IUserService>().Use<UsersManager>();
            x.For<IBiddingService>().Use<BiddingService>();
            x.For<ISearchService>().Use<SearchService>();
            x.For<IFaqService>().Use<FaqService>();
            x.For<IItemsService>().Use<ItemsService>();
            x.For<IMessagingService>().Use<MessagingService>();
            x.For<IStaticQueriesService>().Use<StaticQueriesService>();
            x.For < IImagesService<Image>>().Use<ImagesService>();
            x.For<ICommentingService>().Use<CommentingService>();
            x.For<ICategoryService>().Use<CategoryService>();
            x.For<IHelper>().Use<Helper>();
            x.For<HttpContext>().HttpContextScoped().Use(HttpContext.Current);

            x.For(typeof(Validator<>)).Use(typeof(NullValidator<>));

            x.For<Validator<Rating>>().Use<RatingValidator>();
            x.For<Validator<TopLevelCategory>>().Use<TopLevelCategoryValidator>();
        });

        Func<Type, IValidator> validatorFactory = type =>
        {
            var valType = typeof(Validator<>).MakeGenericType(type);
            return (IValidator)ObjectFactory.GetInstance(valType);
        };

        ObjectFactory.Configure(x => x.For<IValidationProvider>().Use(() => new ValidationProvider(validatorFactory)));
        return ObjectFactory.Container;
    }

?

Answer 1

, , , . , . Application_Start Session_Start Global.asax , .

Answer 2

Global.asax.cs

   protected void Session_Start()
   {
   }

, . , ( ).

Answer 3

Do you use it besides accessing HttpContext.Currentdirectly in your code? In other words, are there any places where you enter HttpContextfor the sake of bullying in unit tests?

If you access it directly in your methods, then there is no reason to enter a record x.For<HttpContext>().HttpContextScoped().Use(HttpContext.Current);when you start the application. I wonder if it will start working if you delete it.