class1.cs

来自DoFactory的设计模式, 由于是本人根据已有代码创建,没有NETOptimized项

// Mediator pattern -- Real World example  

using System;
using System.Collections;

namespace DoFactory.GangOfFour.Mediator.RealWorld
{

    // MainApp test application 

    class MainApp
    {
        static void Main()
        {
            // Create chatroom 
            Chatroom chatroom = new Chatroom();

            // Create participants and register them 
            Participant George = new Beatle("George");
            Participant Paul = new Beatle("Paul");
            Participant Ringo = new Beatle("Ringo");
            Participant John = new Beatle("John");
            Participant Yoko = new NonBeatle("Yoko");

            chatroom.Register(George);
            chatroom.Register(Paul);
            chatroom.Register(Ringo);
            chatroom.Register(John);
            chatroom.Register(Yoko);

            // Chatting participants 
            Yoko.Send("John", "Hi John!");
            Paul.Send("Ringo", "All you need is love");
            Ringo.Send("George", "My sweet Lord");
            Paul.Send("John", "Can't buy me love");
            John.Send("Yoko", "My sweet love");

            // Wait for user 
            Console.Read();
        }
    }

    // "Mediator" 

    abstract class AbstractChatroom
    {
        public abstract void Register(Participant participant);
        public abstract void Send(
          string from, string to, string message);
    }

    // "ConcreteMediator" 

    class Chatroom : AbstractChatroom
    {
        private Hashtable participants = new Hashtable();

        public override void Register(Participant participant)
        {
            if (participants[participant.Name] == null)
            {
                participants[participant.Name] = participant;
            }

            participant.Chatroom = this;
        }

        public override void Send(
          string from, string to, string message)
        {
            Participant pto = (Participant)participants[to];
            if (pto != null)
            {
                pto.Receive(from, message);
            }
        }
    }

    // "AbstractColleague" 

    class Participant
    {
        private Chatroom chatroom;
        private string name;

        // Constructor 
        public Participant(string name)
        {
            this.name = name;
        }

        // Properties 
        public string Name
        {
            get { return name; }
        }

        public Chatroom Chatroom
        {
            set { chatroom = value; }
            get { return chatroom; }
        }

        public void Send(string to, string message)
        {
            chatroom.Send(name, to, message);
        }

        public virtual void Receive(
          string from, string message)
        {
            Console.WriteLine("{0} to {1}: '{2}'",
              from, Name, message);
        }
    }

    //" ConcreteColleague1" 

    class Beatle : Participant
    {
        // Constructor 
        public Beatle(string name)
            : base(name)
        {
        }

        public override void Receive(string from, string message)
        {
            Console.Write("To a Beatle: ");
            base.Receive(from, message);
        }
    }

    //" ConcreteColleague2" 

    class NonBeatle : Participant
    {
        // Constructor 
        public NonBeatle(string name)
            : base(name)
        {
        }

        public override void Receive(string from, string message)
        {
            Console.Write("To a non-Beatle: ");
            base.Receive(from, message);
        }
    }
}