mediatorGof.cs

using System;

namespace ConsoleApp1
{
    internal class Program
    {
        public static void Main(string[] args)
        {
            ConcreteMediator mediator = new ConcreteMediator();
            ConcreteColleague1 colleague1 = new ConcreteColleague1(mediator);
            ConcreteColleague2 colleague2 = new ConcreteColleague2(mediator);

            mediator.Colleague1 = colleague1;
            mediator.Colleague2 = colleague2;
            
            colleague1.Send("Olá, tudo bem com você?");
            colleague2.Send("Sim, e com você?");
            
            Console.ReadKey();
        }
    }

    /// <summary>
    /// A interface do Mediator
    /// </summary>
    public interface IMediator
    {
        void Send(string message, Colleague colleague);
    }

    /// <summary>
    /// A classe concreta, que implementa a interface IMediator.
    /// </summary>
    public class ConcreteMediator : IMediator
    {
        public ConcreteColleague1 Colleague1 { get; set; }
        public ConcreteColleague2 Colleague2 { get; set; }
        
        public void Send(string message, Colleague colleague)
        {
            if (colleague == Colleague1)
            {
                Colleague2.Notify(message, colleague);
            }
            else
            {
                Colleague1.Notify(message, colleague);
            }
        }
    }

    /// <summary>
    /// A classe base abstrata dos Colleagues
    /// </summary>
    public abstract class Colleague
    {
        protected IMediator mediator;
     
        public Colleague(IMediator mediator)
        {
            this.mediator = mediator;
        }
    }

    /// <summary>
    /// A classe concreta Colleague que herda da abastrata
    /// </summary>
    public class ConcreteColleague1 : Colleague
    {
        public ConcreteColleague1(IMediator mediator)
            : base(mediator) { }

        public void Send(string message)
        {
            mediator.Send(message, this);
        }

        public void Notify(string message, Colleague colleague)
        {
            Console.WriteLine(string.Format("ConcreteColleague1 recebeu a seguinte msg do {1}: {0}", message, colleague.GetType().Name));
        }
    }

    /// <summary>
    /// A segunda classe concreta Colleague que herda da abastrata
    /// </summary>
    public class ConcreteColleague2 : Colleague
    {
        public ConcreteColleague2(IMediator mediator)
            : base(mediator) {}

        public void Send(string message)
        {
            mediator.Send(message, this);
        }

        public void Notify(string message, Colleague colleague)
        {
            Console.WriteLine(string.Format("ConcreteColleague2 recebeu a seguinte msg do {1}: {0}", message, colleague.GetType().Name));
        }
    }
}