关于socket异步的一个怪异问题，遍历socket列表发送消息时必须sleep

niit_zc 2010-11-12 01:29:13

写了一个小的聊天软件，用哈希表clientSockets保存用户连接的socket，当有新用户登录时遍历clientSockets把用户列表发送到各个客户端。



foreach (DictionaryEntry de in clientSockets)

                {

                    Socket workSocket = (Socket)de.Value;

                    System.Threading.Thread.Sleep(1);//????????????????????????

                    workSocket.Send(_mes, 0, _mes.Length, 0);

                }

如上代码，必须加上System.Threading.Thread.Sleep(1);这句，否则只有第一个连接的客户端正常，其他客户端实际上也能连接到服务端，但接受不到任何信息，但发送的信息可以被服务端接收到。

服务端采用的是BeginAccept方法建立连接，如下
server.BeginAccept(new AsyncCallback(OnClientConnect), null);



public void OnClientConnect(IAsyncResult ar)

        {

            Socket _client = server.EndAccept(ar);

            clientSockets.Add(_client.RemoteEndPoint.ToString(), _client);



            byte[] mes = new byte[10000];

            int rel = _client.Receive(mes);

            ClientInfo tempClient = (ClientInfo)Serialize.Deserialize(mes, rel);

            if (tempClient.Headers == "join")

            {

                clients.Add(_client.RemoteEndPoint.ToString(), tempClient);

                DataStruct pocket = new DataStruct();

                pocket.Headers = "join";

                pocket.HostIP = tempClient.HostIP;

                pocket.Message = clients;

                byte[] _mes = Serialize.serialize(pocket);

                foreach (DictionaryEntry de in clientSockets)

                {

                    Socket workSocket = (Socket)de.Value;

                    System.Threading.Thread.Sleep(1);//????????????????????????

                    workSocket.Send(_mes, 0, _mes.Length, 0);

                }

            }

            tempClient.Message = new byte[10000];

            _client.BeginReceive(tempClient.Message, 0, tempClient.Message.Length, 0, new AsyncCallback(RecieveCallBack), _client);



            server.BeginAccept(new AsyncCallback(OnClientConnect), null);

        }