  public abstract class Colleague
    {
        protected Mediator mediator = null;//通過Mediator對外溝通
        public Colleague(Mediator mediator)
        {
            this.mediator = mediator;
        }
        /// <summary>
        /// Mediator 請求通知
        /// </summary>
        public abstract void Request(string message);
    }

Colleague為抽象類，擁有一個類型為Mediator的屬性成員mediator ，用來指向中介者，而這個中介者會在建造者中被指定。

實現(xiàn)各Colleague類：

public class ConcreteColleague1:Colleague
    {
        public ConcreteColleague1(Mediator mediator):base(mediator)
        {
        }
        /// <summary>
        /// 執(zhí)行動作
        /// </summary>
        public void Action()
        {
            //執(zhí)行后需要通知其他Colleague
            mediator.SendMessage(this, "Colleage1 發(fā)出通知");
        }
        /// <summary>
        /// Mediator 通知請求
        /// </summary>
        /// <param name="message"></param>
        public override void Request(string message)
        {
        }
    }
    public class ConcreteColleague2:Colleague
    {
        public ConcreteColleague2(Mediator mediator):base(mediator)
        {
        }
        /// <summary>
        /// 執(zhí)行動作
        /// </summary>
        public void Action()
        {
            //執(zhí)行后需要通知其他Colleague
            mediator.SendMessage(this, "Colleage2 發(fā)出通知");
        }
        /// <summary>
        /// Mediator 通知請求
        /// </summary>
        /// <param name="message"></param>
        public override void Request(string message)
        {
        }
    }

每一個繼承自Colleague的ConcreteColleagueX類，需要對外界溝通時，都會通過mediator來傳遞信息。

Mediator接口，用來管理Colleague對象的接口：

    public abstract class Mediator
    {
        public abstract void SendMessage(Colleague colleague, string message);
    }

Mediator定義了一個抽象方法SendMessage()，主要用于從外界傳遞信息給Colleague。

最后，實現(xiàn)ConcreteMediator類，該類擁有所有“要在內(nèi)部進行溝通的Colleague子類的引用”：

    public class ConcreteMediator:Mediator
    {
        ConcreteColleague1 colleague1 = null;
        ConcreteColleague2 colleague2= null;
        public void SetColleague1(ConcreteColleague1 colleague1)
        {
            this.colleague1 = colleague1;
        }
        public void SetColleague2(ConcreteColleague2 colleague2)
        {
            this.colleague2 = colleague2;
        }
        /// <summary>
        /// 收到來自Colleague請求
        /// </summary>
        public override void SendMessage(Colleague colleague, string message)
        {
            //收到colleague1通知colleague2
            if (colleague1 == colleague)
                colleague2.Request(message);
            //收到colleague2通知colleague1
            if (colleague2 == colleague)
                colleague1.Request(message);
        }
    }

實現(xiàn)中介者模式的測試：

public class MediatorTest
    {
        public void UnitTest()
        {
            //產(chǎn)生中介者
            ConcreteMediator concreteMediator = new ConcreteMediator();
            //產(chǎn)生兩個Colleague
            ConcreteColleague1 colleague1 = new ConcreteColleague1(concreteMediator);
            ConcreteColleague2 colleague2 = new ConcreteColleague2(concreteMediator);
            //設置給中介者
            concreteMediator.SetColleague1(colleague1);
            concreteMediator.SetColleague2(colleague2);
            //執(zhí)行
            colleague1.Action();
            colleague2.Action();
        }
    }