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c#asp.net-mvcentity-frameworkdependency-injectionninject
janhartmann
janhartmann

Reputation: 15003

Using NinjectModules from Service layer

I fail to understand how to probably setup my Ninject IoC container. I have a Service layer which contains implementations of several services and implementation of my DbContext and ASP.NET Identity like so:

public class IdentityModule : NinjectModule
{
        public override void Load()
        {
            Bind<IUserStore<User, int>>().To<UserService>().InSingletonScope();
            Bind<UserManager<User, int>>().ToSelf().InSingletonScope();

            Bind<IRoleStore<UserRole, int>>().To<UserRoleService>().InSingletonScope();
            Bind<RoleManager<UserRole, int>>().ToSelf().InSingletonScope();
        }
}

public class EntityFrameworkModule : NinjectModule
{
       public override void Load()
       {
           Bind<EntityDbContext>().ToSelf();
           Bind<ICreateDbModel>().To<DefaultDbModelCreator>();
           Bind<IUnitOfWork>().To<EntityDbContext>();
           Bind<IWriteEntities>().To<EntityDbContext>();
           Bind<IReadEntities>().To<EntityDbContext>();
       }
}

These are loaded into my NinjectWebCommen (MVC layer):

private static void RegisterServices(IKernel kernel)
{
    var modules = new INinjectModule[]
                      {
                         new EntityFrameworkModule(),
                         new IdentityModule()
                      };

    kernel.Load(modules);
}

Now my question is:

My EntityDbContext should be request scoped, but I am unable to set .InRequestScope() from my service layer. Should this INinjectModule then be moved to the MVC layer instead of lying in the service layer or should I reference Ninject.Web.Common in my service layer? This just seem to be a wrong way since the service layer is not a web-app.

Upvotes: 1

Views: 988

Answers (2)

Artur Kedzior
Artur Kedzior

Reputation: 4273

This place where you wire everything together is called the Composition Root in DI terminology

One of the suggestions is to create a bootstrap for all layers. Check this SO:

Where to locate Ninject modules in a multi-tier application

Upvotes: 1

Fred Chateau
Fred Chateau

Reputation: 879

This is not the best answer but I have been having the same problem. First, make sure Ninject and Ninject.Web.Common are referenced in the service layer, and that you have a using statement for Ninject.Web.Common in your module class.

I couldn't find InRequestScope in Intellisense. I tried a few times opening and closing the project, and it finally showed up. Didn't do anything but close and re-open Visual Studio and it started working.

Upvotes: 0

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