using System;

using Unity;

//using Unity.Resolution;

​

namespace IOC

{

    public class Program

    {

        public static void Main(string[] args)

        {

            IUnityContainer container = new UnityContainer();

            container.RegisterType<IFoo, Foo>();

            container.RegisterType<IBar, Bar>();

​

            //IFoo foo = container.Resolve<IFoo>(new ParameterOverride("bar", null));

            IFoo foo = container.Resolve<IFoo>();

            foo.HeyFoo();

            //IBar bar = container.Resolve<IBar>(new ParameterOverride("foo", foo));

            IBar bar = container.Resolve<IBar>();

            bar.HeyBar();

            bar.SetFoo(foo);

            bar.HeyBar();

            foo.HeyFoo();

        }

    }

​

    public interface IFoo

    {

        void HeyFoo();

        void SetBar(IBar bar);

    }

​

    public class Foo : IFoo

    {   

        private readonly string Id = "87";

        IBar bar { get; set;}

        public Foo(IBar bar) {

            Id = "87";

            this.bar = bar;

        }

        public void SetBar(IBar bar) {

            this.bar = bar;

        }

        public void HeyFoo()

        {       

            if (bar != null)

                bar.SetFoo(this);

            Console.WriteLine("HeyFoo was called. My bar was " + (bar == null ? "NULL" : bar.ToString()));

        }

        public override string ToString() {

            return Id;

        }

    }

​

    public interface IBar

    {

        void HeyBar();

        void SetFoo(IFoo foo);

    }

​

    public class Bar : IBar

    {

        private readonly string Id = "42";

        IFoo foo { get; set;}

​

        public Bar(IFoo foo)

        {

            Id = "42";

            this.foo = foo;

        }

​

        public void SetFoo(IFoo foo) {

            this.foo = foo;

        }

        public void HeyBar()

        {

            if (foo != null) 

                foo.SetBar(this);

            Console.WriteLine("HeyBar was called. My foo was " + (foo == null ? "NULL" : foo.ToString()));

        }

        public override string ToString() {

            return Id;

        }

    }

}

​