using System;

using System.Collections.Generic;

​

namespace Example

{

    public class Program

    {

        static public void Main(string[] args)

        {

            IClass2 c2= new Class2();                         

            Class1 c1 = new Class1(c2);

            c1.Process<Student>(new Student());

        }

    }

​

    public interface IClass1 {

        bool Process<T>(T t) where T : ISaveable;

​

    }

​

​

    public class Class1 : IClass1

    {

​

        IClass2 _repo;

​

        public Class1(IClass2 repo)

        {

            _repo = repo;

        }

​

        public bool Process<T>(T t) where T : ISaveable

        {

            t.Save(_repo);

            return true;

        }

    }

​

    public interface IClass2

    {

        void Save(Student e);

        void Save(Teacher e);

    }

​

    public class Class2 : IClass2

    {

        public void Save(Student e)

        {

            return;

        }

​

        public void Save(Teacher e)

        {

            return;

        }

    }

​

    public interface ISaveable

    {

        void Save(IClass2 repo);

    }

​

    public class Student : ISaveable

    { 

        public void Save(IClass2 repo) 

        {

            repo.Save(this);

        }

    }

​

    public class Teacher : ISaveable

    { 

        public void Save(IClass2 repo)

        {

            repo.Save(this);

        }

    }

​

​

​

}