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I want to resolve a parent class which takes a child class as a parameter and both implements the same interface.

How should I go about writing the AutoFac bootstrap file to resolve the EmailNotifier?

When I try to resolve I get the circular dependency error. Following is the code. I Already tried builder.RegisterAssemblyTypes this brings only the child implementation

   using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using Autofac;



namespace AutoFactTest

{

    // This interface lets you send some content

    // to a specified destination.

    public interface ISender

    {

        string Send(string message);

    }



    // We can implement the interface for different

    // "sending strategies":

    public class PostalServiceSender : ISender

    {

        public string Send(string message)

        {

            return message;

        }

    }

    public class EmailNotifier : ISender

    {

        ISender _postal;



        public EmailNotifier(ISender postal)

        {

            _postal = postal;

        }

        public string Send(string message)

        {

            return "EMail " + message;

        }



        public string DoSomethingElse(string message)

        {

            return "Do Something Else with " + Send(message);

        }

    }



    public class PostalModule : Module

    {

        protected override void Load(ContainerBuilder builder)

        {

            builder.RegisterType<PostalServiceSender>().AsSelf().As<ISender>().InstancePerDependency();

        }

    }



    public class EmailModule : Module

    {

        protected override void Load(ContainerBuilder builder)

        {

            builder.RegisterModule<PostalModule>();

            builder.RegisterType<EmailNotifier>().AsSelf().As<ISender>().InstancePerDependency();

        }

    }





    class Program

    {

        static void Main(string args)

        {

            var builder = new ContainerBuilder();

            builder.RegisterModule<EmailModule>();

    //This doesn't work because it takes only child implementation

  //          builder.RegisterAssemblyTypes(typeof(EmailNotifier).Assembly)

  //.Where(x => x.Name.EndsWith("Sender"))

  //.AsImplementedInterfaces();

            var container = builder.Build();



           ISender  sender = container.Resolve<ISender>();

           var output =  container.Resolve<EmailNotifier>(new Autofac.NamedParameter("postal", sender));

        }

    }

}