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I’ve been reading through several blog post about how people configure DI support in the new ASP.NET Web Api. For example you can read about it here :

• Official “Using the Web API Dependency Resolver”
• “Autofac ASP.NET Web API (Beta) Integration“
• “Web Api and Ninject”

What stands out is that every implementation relays on System.Web.Http.Services.IDependencyResolver interface which is similar to the one introduced in the ASP.NET MVC 3 and which lives in the System.Web.Mvc namespace to avoid confusion. Let’s look at it’s implementation details :

public interface IDependencyResolver
	    {
	        object GetService(System.Type serviceType);
	 
	        IEnumerable<object> GetServices(System.Type serviceType);
	 
	    }