中介者模式

class Program
    {
        static void Main(string[] args)
        {
            ConcreteMediator m = new ConcreteMediator();
            ConcreteColleagueA cA = new ConcreteColleagueA(m);
            ConcreteColleagueB cB = new ConcreteColleagueB(m);
            m.ColleagueA = cA;
            m.ColleagueB = cB;
            cA.Send("how are jim");
            cB.Send("I'm fine,thank you!");
            Console.Read();
        }
    }
    abstract class Mediator
    {
        public abstract void Send(string msg, Colleague colleague);
    }
    class ConcreteMediator:Mediator
    {
        private ConcreteColleagueA _colleagueA;

        internal ConcreteColleagueA ColleagueA
        {
            get { return _colleagueA; }
            set { _colleagueA = value; }
        }
        private ConcreteColleagueB _colleagueB;

        internal ConcreteColleagueB ColleagueB
        {
            get { return _colleagueB; }
            set { _colleagueB = value; }
        }
        public override void Send(string msg, Colleague colleague)
        {
            if (colleague == _colleagueA)
                _colleagueB.Notify(msg);
            else if(colleague==_colleagueB)
                _colleagueA.Notify(msg);
        }
    }
    abstract class Colleague
    {
        protected Mediator mediator;
        public Colleague(Mediator mediator)
        {
            this.mediator = mediator;
        }
    }
    class ConcreteColleagueA : Colleague
    {
        public ConcreteColleagueA(Mediator mediator)
            : base(mediator)
        {
 
        }
        public void Send(string msg)
        {
            mediator.Send(msg, this);
        }
        public void Notify(string msg)
        {
            Console.WriteLine("ConcreteColleagueA's msg->"+msg);
        }
    }
    class ConcreteColleagueB:Colleague
    {
        public ConcreteColleagueB(Mediator mediator)
            :base(mediator)
        {

        }
        public void Send(string msg)
        {
            mediator.Send(msg, this);
        }
        public void Notify(string msg)
        {
            Console.WriteLine("ConcreteColleagueB's msg->" + msg);
        }
    }