Setter Injection with Unity for ActionFilter

Question

Hi I use MS Unity Container with my MVC 3 application.

I want to use setter injection to inject a dependency for Action filter. I have an action filter which I am registering in global.asax and this action Filter calls a repository class to load some data. I want to inject concrete class using DI. It can be very easily achieved with StructureMap. But somehow I can't get it working with Unity. I have tried all solutions from this link.

Here is my code:

MyActionFilter.cs

public class GlobalViewBagActionFilter : ActionFilterAttribute
{
    public IUserRepo UserRepo { get; set; }

    public override void OnResultExecuting(ResultExecutingContext filterContext)
    {
        var testVal = UserRepo.LoadData();
    }
}

Registering Action Filter in Global.asax.cs

private static void RegisterGlobalFilters(GlobalFilterCollection filters)
    {
        filters.Add(new GlobalViewBagActionFilter());
    }

calling the above method on Appliation_Start to register

RegisterGlobalFilters(GlobalFilters.Filters);

I have tried many possible code block for registering the class but nothing worked. Either I would get an exception or on the action filter, UserRepo property would be null.

Any pointers on how do i get it working?

score 1 · Answer 1 · answered Aug 21 '12 at 06:32

You need to setup the container:

private static void RegisterGlobalFilters(GlobalFilterCollection filters)
{
    var container = new UnityContainer()
       .RegisterType<IUserRepo, UserRepoImpl>()

       .RegisterType<GlobalViewBagActionFilter>(
           new InjectionProperty("UserRepo", new ResolvedParameter<IUserRepo>()) 
       );


    filters.Add(container.Resolve<GlobalViewBagActionFilter>());
}

Setter Injection with Unity for ActionFilter

1 Answers1