using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        Handle(new A());

        Handle(new B());

        HandleDictonary(new Dictionary<ulong, A>(){

            {0, new A()}

        });

        HandleDictonary(new Dictionary<ulong, A>(){

            {0, new B()}

        });

    }   

    public static void Handle(A input){

        Console.WriteLine("Funcionou");

    }

    public static void HandleDictonary(IDictionary<ulong, A> input){

        Console.WriteLine("Funcionou o dicionário");

    }

}

​

public class A {}

public class B : A{}