public static async Task DealWidth(string message, ChatHub chatHub)
        {
            await Task.Run(() => {
                try
                {
                    MessageData data = JsonConvert.DeserializeObject <MessageData>(message);
                    if (data != null)
                    {
                        ConnectionUser connectionUser = null;
                        MessageData sendMsg           = null;
                        switch (data.MessageType)
                        {
                        case MessageType.Line:
                            connectionUser = ConnectionManager.ConnectionUsers.Where(m => m.ConnectionId == chatHub.Context.ConnectionId).FirstOrDefault();
                            //处理连接消息
                            if (connectionUser == null)
                            {
                                connectionUser = new ConnectionUser();
                                connectionUser.ConnectionId = chatHub.Context.ConnectionId;
                                connectionUser.UserId       = data.SendUserId;
                                ConnectionManager.ConnectionUsers.Add(connectionUser);
                            }
                            //处理发送回执消息
                            sendMsg             = new MessageData();
                            sendMsg.MessageBody = "";
                            sendMsg.MessageType = MessageType.LineReceipt;
                            sendMsg.SendUserId  = "0";
                            chatHub.Clients.Client(chatHub.Context.ConnectionId).SendAsync("receive", JsonConvert.SerializeObject(sendMsg));
                            break;

                        case MessageType.Text:
                            //处理普通文字消息
                            ChatCore.SendMessage(chatHub, data);
                            break;

                        case MessageType.LineReceipt:
                            //处理连接回执消息
                            ChatCore.SendMessage(chatHub, data);
                            break;
                        }
                    }
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
            });
        }