private void ProcessAccept(SocketAsyncEventArgs e)
        {
            if (e.LastOperation != SocketAsyncOperation.Accept)//检查上一次操作是否是Accept，不是就返回
                return;
            string UID = GetIDByIP((e.AcceptSocket.RemoteEndPoint as IPEndPoint).Address.ToString());//根据IP获取用户的UID

            try
            {
                if (e.SocketError == SocketError.Success)
                {
                    if (string.IsNullOrEmpty(UID))    //判断现在的用户是否已经连接，避免同一用户开两个连接
                        return;
                    if (readWritePool.BusyPoolContains(UID))
                        return;

                    SocketAsyncEventArgsWithId readEventArgsWithId = this.readWritePool.Pop(UID);
                    readEventArgsWithId.ReceiveSAEA.UserToken = e.AcceptSocket;
                    readEventArgsWithId.SendSAEA.UserToken = e.AcceptSocket;
                    Interlocked.Increment(ref this.numConnections);//修改连接数

                    //侦听到客户端连接开始接受数据（我是不是需要在这儿开个线程来接收数据)
                    Boolean willRaiseEvent = e.AcceptSocket.ReceiveAsync(readEventArgsWithId.ReceiveSAEA);
                    if (!willRaiseEvent)
                    {
                        this.ProcessReceive(readEventArgsWithId.ReceiveSAEA);
                    }
                }
                else
                {
                    CloseClientSocket(UID);
                }
            }
            catch (Exception)
            {
                CloseClientSocket(UID);
            }
            finally
            {
                this.StartAccept(e);
            }
        }