static void Main(String[] args)
{
    President mediator = new President();
    Market market = new Market(mediator);
    Development development = new Development(mediator);
    Financial financial = new Financial(mediator);

    mediator.SetFinancial(financial);
    mediator.SetDevelopment(development);
    mediator.SetMarket(market);

    market.Process();
    market.Apply();

}

//抽象中介者角色
public interface Mediator
{
    void Command(Department department);
}

//總經理--相當于具體中介者角色
public sealed class President : Mediator
{
    //總經理有各個部門的管理權限
    private Financial _financial;
    private Market _market;
    private Development _development;

    public void SetFinancial(Financial financial)
    {
        this._financial = financial;
    }
    public void SetDevelopment(Development development)
    {
        this._development = development;
    }
    public void SetMarket(Market market)
    {
        this._market = market;
    }

    public void Command(Department department)
    {
        if (department.GetType() == typeof(Market))
        {
            _financial.Process();
        }
    }
}

//同事類的接口
public abstract class Department
{
    //持有中介者(總經理)的引用
    private Mediator mediator;

    protected Department(Mediator mediator)
    {
        this.mediator = mediator;
    }

    public Mediator GetMediator
    {
        get { return mediator; }
        private set { this.mediator = value; }
    }

    //做本部門的事情
    public abstract void Process();

    //向總經理發出申請
    public abstract void Apply();
}

//開發部門
public sealed class Development : Department
{
    public Development(Mediator m) : base(m) { }

    public override void Process()
    {
        Console.WriteLine("我們是開發部門，要進行項目開發，沒錢了，需要資金支持！");
    }

    public override void Apply()
    {
        Console.WriteLine("專心科研，開發項目！");
    }
}

//財務部門
public sealed class Financial : Department
{
    public Financial(Mediator m) : base(m) { }

    public override void Process()
    {
        Console.WriteLine("匯報工作！沒錢了，錢太多了！怎么花?");
    }

    public override void Apply()
    {
        Console.WriteLine("數錢！");
    }
}

//市場部門
public sealed class Market : Department
{
    public Market(Mediator mediator) : base(mediator) { }

    public override void Process()
    {
        Console.WriteLine("匯報工作！項目承接的進度，需要資金支持！");
        GetMediator.Command(this);
    }

    public override void Apply()
    {
        Console.WriteLine("跑去接項目！");
    }
}