StructureMap Dependency Resolution : Manually get instance from ActionFilter

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));

This question has nothing to do with NHibernate. You should remove that tag. — Miroslav Popovic
– Miroslav Popovic, Commented Jun 22, 2012 at 21:53

Miroslav Popovic · Accepted Answer · 2012-06-22 23:45:01Z

3

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.

edited Jun 22, 2012 at 23:45

answered Jun 22, 2012 at 21:51

Miroslav Popovic

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3 Comments

user321605 Over a year ago

I'm not sure if it matters, but this is MVC4. Everything I've looked at says that I need to get fancy if I want to inject into my filters/attributes. Can you provide a more detailed example?

Miroslav Popovic Over a year ago

Sorry, I thought that you are already using constructor injection in your action filter. I have edited the answer. See if anything of these could help.

user321605 Over a year ago

You're the man! I went with option1. Option2 gets to be a pain because there are 2 identical interfaces for resolvers.

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