Dependency injection not working with Owin self-hosted Web Api 2 and Autofac

Question

I\'m finding my feet with Web Api 2, Owin and Autofac and need some guidance, please.

Overview
I have an Owin self-hosted Web Api that uses Auto

Answer 1

You should be using the HttpConfiguration with which you're bootstrapping OWIN everywhere. So, this:

GlobalConfiguration.Configuration.DependencyResolver = resolver;

Should become:

config.DependencyResolver = resolver;

Other than that, everything looks good. Api controllers are registered, although you're not giving them a scope. Not sure if in Autofac scoping defaults to per-request for controllers or if it has the notion of per-request scoping at all (I know that LightInject has it).

Looking around, I think you followed the example on the Google Code repo for Autofac, which indeed uses GlobalConfiguration. Instead, if you look at the GitHub example, it is a bit different. Try to make the changes according to this. Including this:

// This should be the first middleware added to the IAppBuilder.
app.UseAutofacMiddleware(container);

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2016 update

What I said above still applies, but something extra from Autofac's docs (thanks Brad):

A common error in OWIN integration is use of the GlobalConfiguration.Configuration. In OWIN you create the configuration from scratch. You should not reference GlobalConfiguration.Configuration anywhere when using the OWIN integration.