场景：服务端与客户端通过webSocket方式通话，websocket充当中介

abstract class TongXinObject { protected Agency agency; public TongXinObject(Agency _agency) { agency = _agency; } abstract public void SendMsg(string msg); abstract public void ReviceMsg(string sender, string msg); } class Service : TongXinObject { public string Name = "服务器"; public Service(Agency _agency) : base(_agency) { } public override void ReviceMsg(string sender, string msg) { Console.WriteLine("{0}收到{1}发送的消息：{2}", Name,sender, msg); } public override void SendMsg(string msg) { agency.TuiSongMsg(this, msg); //交给中介推送，其他的不管 } } class Client1 : TongXinObject { public string Name = "手机APP"; public Client1(Agency _agency) : base(_agency) { } public override void ReviceMsg(string sender, string msg) { Console.WriteLine("{0}收到{1}发送的消息：{2}", Name, sender, msg); } public override void SendMsg(string msg) { agency.TuiSongMsg(this, msg); //交给中介推送 } } class Client2 : TongXinObject { public string Name = "PC客户端"; public Client2(Agency _agency) : base(_agency) { } public override void ReviceMsg(string sender, string msg) { Console.WriteLine("{0}收到{1}发送的消息：{2}", Name, sender, msg); } public override void SendMsg(string msg) { agency.TuiSongMsg(this, msg); } } //中介 abstract class Agency { public Service service { get; set; } //中介需要知道通话双方 public Client1 client1 { get; set; } public Client2 client2 { get; set; } abstract public void TuiSongMsg(TongXinObject obj, string msg); } class WebSocket : Agency { public override void TuiSongMsg(TongXinObject obj,string msg) { if (obj == service) { client1.ReviceMsg(service.Name,msg); client2.ReviceMsg(service.Name,msg); } else if (obj == client1) { service.ReviceMsg(client1.Name, msg); client2.ReviceMsg(client1.Name, msg); } else if (obj == client2) { service.ReviceMsg(client2.Name, msg); client1.ReviceMsg(client2.Name, msg); } } } //前端: static void Main(string[] args) { Agency agency = new WebSocket(); Service service = new Service(agency); Client1 client1 = new Client1(agency); Client2 client2 = new Client2(agency); agency.service = service; agency.client1 = client1; agency.client2 = client2; service.SendMsg("零点停电维护"); client1.SendMsg("我嬲！"); client2.SendMsg("尼玛，我PC端不接火"); Console.Read(); }

总结：服务端与客户端完全脱离耦合，职责相当明确。
优点：减少耦合，交互的过程独立成单独的类（中介类）。
缺点：中介类的职责过于庞大，不好维护。

中介者+职责链的代码如下，纯粹练手，是为了模式而模式，实际开发可别这么做。

//TongXinObject和上面一样//职责···把上面中介中的if else 抽象出来abstract class ZhiZe { public Service service { get; set; } public Client1 client1 { get; set; } public Client2 client2 { get; set; } public ZhiZe(Service _service, Client1 _client1, Client2 _client2) { service = _service; client1 = _client1; client2 = _client2; } public ZhiZe superZhiZe { get; set; } public void SetSuperZhiZe(ZhiZe _zhiZe) { superZhiZe = _zhiZe; } abstract public void TuiSongMsg(TongXinObject tongXinObject, string msg); } class Client1ZhiZe : ZhiZe { public Client1ZhiZe(Service _service, Client1 _client1, Client2 _client2) : base(_service, _client1, _client2) { } public override void TuiSongMsg(TongXinObject tongXinObject, string msg) { if (tongXinObject == client1) { service.ReviceMsg(client1.Name, msg); client2.ReviceMsg(client1.Name, msg); } else { superZhiZe.TuiSongMsg(tongXinObject, msg); } } } class Client2ZhiZe : ZhiZe { public Client2ZhiZe(Service _service, Client1 _client1, Client2 _client2) : base(_service, _client1, _client2) { } public override void TuiSongMsg(TongXinObject tongXinObject, string msg) { if (tongXinObject == client2) { service.ReviceMsg(client2.Name, msg); client1.ReviceMsg(client2.Name, msg); } else { superZhiZe.TuiSongMsg(tongXinObject, msg); } } } class ServiceZhiZe : ZhiZe { public ServiceZhiZe(Service _service, Client1 _client1, Client2 _client2) : base(_service, _client1, _client2) { } public override void TuiSongMsg(TongXinObject tongXinObject, string msg) { if (tongXinObject == service) { client1.ReviceMsg(service.Name, msg); client2.ReviceMsg(service.Name, msg); } else { Console.WriteLine("over"); } } }//中介abstract class Agency { public ZhiZe ZhiZe1 { get; set; } public ZhiZe ZhiZe2 { get; set; } public ZhiZe ZhiZe3 { get; set; } public Agency() { } public void SetZhiZe(Service service, Client1 client1, Client2 client2) { ZhiZe1 = new Client1ZhiZe(service, client1, client2); ZhiZe2 = new Client2ZhiZe(service, client1, client2); ZhiZe3 = new ServiceZhiZe(service, client1, client2); ZhiZe1.SetSuperZhiZe(ZhiZe2); ZhiZe2.SetSuperZhiZe(ZhiZe3); } abstract public void TuiSongMsg(TongXinObject obj, string msg); } class WebSocket : Agency { public override void TuiSongMsg(TongXinObject obj, string msg) { ZhiZe1.TuiSongMsg(obj, msg); } } //前端： static void Main(string[] args) { //Agency agency = new WebSocket(); //Service service = new Service(agency); //Client1 client1 = new Client1(agency); //Client2 client2 = new Client2(agency); //agency.service = service; //agency.client1 = client1; //agency.client2 = client2; //service.SendMsg("零点停电维护"); //client1.SendMsg("我嬲！"); //client2.SendMsg("尼玛，我PC端不接火"); //Console.Read(); 中介者模式.职责链中介.Agency agency = new 中介者模式.职责链中介.WebSocket(); Service service = new Service(agency); Client1 client1 = new Client1(agency); Client2 client2 = new Client2(agency); agency.SetZhiZe(service, client1, client2); service.SendMsg("零点停电维护"); client1.SendMsg("我嬲！"); client2.SendMsg("尼玛，我PC端不接火"); Console.Read(); } }