Question

I’m trying to follow this tutorial using StructureMap : http://iridescence.no/post/Constructor-Injection-for-ASPNET-MVC-Action-Filters.aspx

What I’m trying to figure out is the StructureMap equivalent of this line:

var container = (ICanResolveDependencies) HttpContext.Current.ApplicationInstance;

I want to get the container back, so I can resolve dependencies there manually.

This is how I am setting the dependencyresolver in global.asax

            GlobalConfiguration.Configuration.ServiceResolver.SetResolver(
            new StructureMapDependencyResolver(container));

Answer 1

You could just require IContainer dependency in your action filter’s constructor. If it’s not registered automatically by StructureMap, you could register it with:

For<IContainer>().Use<Container>();

---

Edit

Option 1: Couldn’t you just use something like:

GlobalConfiguration.Configuration.ServiceResolver.GetService(...)
// or (not sure what would be the right syntax)
GlobalConfiguration.Configuration.ServiceResolver.Current.GetService(...)

There got to be some way of retrieving the current service resolver once you set it.

Option 2: With regular MVC you can get the current resolver like this:

DependencyResolver.Current

And use it like this:

DependencyResolver.Current.GetService()

Looks like WebAPI doesn’t use DependencyResolver, but according to this blog post, you could set it like this:

DependencyResolver.SetResolver(new StructureMapDependencyResolver(container));
// this override is needed because WebAPI is not using DependencyResolver to build controllers
GlobalConfiguration.Configuration.ServiceResolver.SetResolver(
    DependencyResolver.Current.GetService,
    DependencyResolver.Current.GetServices);

Now try to use DependencyResolver.Current from your action filter.

Option 3: Use ObjectFactory.GetInstance directly – Probably not the best idea in MVC project, since it should already be encapsulated in IDependencyResolver instance.