编写一段中介者模式的csharp代码

好的，以下是中介者模式的C#代码示例：

using System;
using System.Collections.Generic;

// 抽象中介者
abstract class Mediator
{
    public abstract void Send(string message, Colleague colleague);
}

// 抽象同事类
abstract class Colleague
{
    protected Mediator mediator;

    public Colleague(Mediator mediator)
    {
        this.mediator = mediator;
    }

    public abstract void Send(string message);
    public abstract void Notify(string message);
}

// 具体中介者
class ConcreteMediator : Mediator
{
    private List<Colleague> colleagues = new List<Colleague>();

    public override void Send(string message, Colleague colleague)
    {
        foreach (Colleague c in colleagues)
        {
            if (c != colleague)
            {
                c.Notify(message);
            }
        }
    }

    public void AddColleague(Colleague colleague)
    {
        colleagues.Add(colleague);
    }
}

// 具体同事类
class ConcreteColleagueA : Colleague
{
    public ConcreteColleagueA(Mediator mediator) : base(mediator)
    {
    }

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

    public override void Notify(string message)
    {
        Console.WriteLine("同事A收到消息：" + message);
    }
}

class ConcreteColleagueB : Colleague
{
    public ConcreteColleagueB(Mediator mediator) : base(mediator)
    {
    }

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

    public override void Notify(string message)
    {
        Console.WriteLine("同事B收到消息：" + message);
    }
}

// 客户端代码
class Client
{
    static void Main(string[] args)
    {
        ConcreteMediator mediator = new ConcreteMediator();

        ConcreteColleagueA colleagueA = new ConcreteColleagueA(mediator);
        ConcreteColleagueB colleagueB = new ConcreteColleagueB(mediator);

        mediator.AddColleague(colleagueA);
        mediator.AddColleague(colleagueB);

        colleagueA.Send("你好，同事B！");
        colleagueB.Send("你好，同事A！");

        Console.ReadKey();
    }
}

希望这个示例能够帮助你理解中介者模式的实现。