C#简易聊天服务器实现与客户端连接

//一.使用委托实现
using System;
namespace Creating_A_Simple_Chat_Server
{
    //创建聊天服务器类；
    class DChatServer
    {
        //声明一个多播(因为返回类型是void)委托类型；
        public delegate void OnMsgArrived(string message);

        //声明一个OnGetString的委托实例
        //注意：这块是private类的，以防止对象被删除或调用委托
        private static OnMsgArrived onMsgArrived;

        //是私有型来防止该类型的实例被实例化；
        private DChatServer()
        { }

        //下面的方法是用为对象提供一个共有的方法添加到onMsgArrived委托调用列表
        public static void ClientConnect(OnMsgArrived onMsgArrived)
        {
            //以下的一句代码在C#中相当于：DChatServer.onMsgArrived=(OnMsgArrived)Delegate.Combine(DChatServer.onMsgArrived,onMsgArrived);
            DChatServer.onMsgArrived += onMsgArrived;
        }

        public static void ClientDisconnect(OnMsgArrived onMsgArried)
        {
            //DChatServer.onMsgArrived=(OnMsgArrived)Delegate.Remove
            //  (DChatServer.onMsgarrived,onMsgArrived);
            DChatServer.onMsgArrived = onMsgArrived;

        }

        //可选SendMsg帮助方法，实验中不是必要的；
        public static void SendMsg(string msg)
        {
            //发送信息给所有的对象；
            SendMsg(msg, null);
        }

        public static void SendMsg(string msg, object excludeClient)
        {
            //给所有的对象发消息除了“excludeClient”
            if (excludeClient == null)
            {
                onMsgArrived(msg);
            }
            else
            {
                Delegate[] DelegateList = onMsgArrived.GetInvocationList();
                for (int i = 0; i < DelegateList.Length; i++)
                {
                    if (DelegateList[i].Target != excludeClient)
                    {
                        ((OnMsgArrived)DelegateList[i])(msg);
                    }
                }
            }
        }
    }