Injecting dependencies into custom Web API action filter attribute with Autofac

Question

I\'m trying to resolve the dependencies of my custom AuthorizeAttribute which I use to decorate my API controllers in an MVC4 app. Problem is that I keep getting a

Answer 1

In addition to configuring property injection, as outlined in other answers, you can also explicitly resolve dependencies in the OnActivating callback.

public class MyAuthorizeAttribute : AuthorizeAttribute
{
    private IAuthenticationSvc _authenticationSvc;
    public void SetAuthenticationSvc(IAuthenticationSvc svc)
    {
       this._authenticationSvc = svc;
    }
}

And then register the type:

builder.RegisterType()
    .OnActivating(_ => _.Instance.SetAuthenticationSvc(_.Context.Resolve()));

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Note: You can do the same with a property instead of a method. I chose to use a method here only to illustrate that this solution was not dependent on PropertiesAutowired.