using System;

​

​

public interface InterfaceCommon

{

    void Function();

}

​

public class Implementacion1 : InterfaceCommon

    {

        public void Function()

        {

            Console.WriteLine("I am Method1");

        }

    }

​

    public class Implementacion2 : InterfaceCommon

    {

        public void Function()

        {

            Console.WriteLine("I am Method2");

        }

    }

​

    public abstract class A

    {

        private readonly InterfaceCommon interfaceCommon;

​

        protected A(InterfaceCommon interfaceCommon)

        {

            this.interfaceCommon = interfaceCommon;

        }

​

        public void  CallFunction()

        {

            interfaceCommon.Function();

        }

​

    }

​

​

public class B : A

    {

       public B() : base(new Implementacion1()) {  }

​

    }

​

    public class C : A

    {

        public C() : base(new Implementacion2()) { }

​

    }

​

    public class Program

    {

        public static void Main(string[] args)

        {

            var b = new B();

            b.CallFunction();

            var c = new C();

            c.CallFunction();

            Console.ReadLine();

        }

    }