c# - Windows Phone 7 和套接字 : What am I doing wrong?

Question

所以我建立了一个连接，一切正常，然后我开始设置代码以从服务器读取数据包。我想要构建它的方式是使用一种数据包标识符方法，该方法读取单个字节(数据包 ID)并分支到适当的方法以读取其余部分。问题在于那里的最后一条语句 - 一切正常，直到我分支，当我得到这个异常时:

An asynchronous socket operation is already in progress using this SocketAsyncEventArgs instance.

总体思路如下:

    private void IdentifyPacket(object sender, SocketAsyncEventArgs e)
    {
        e.Completed -= new EventHandler<SocketAsyncEventArgs>(IdentifyPacket);
        if (e.SocketError != SocketError.Success)
        {
            ForceDisconnectWithError(new SocketErrorEventArgs(netSocket, e.SocketError));
            return;
        }

        PacketID packet = (PacketID)e.Buffer[0];

        switch (packet)
        {
            case PacketID.KeepAlive:
                e.SetBuffer(new byte[4], 0, 4);
                e.Completed += new EventHandler<SocketAsyncEventArgs>(HandleKeepAlive);
                e.ConnectSocket.ReceiveAsync(e);
                break;
            default:
                RelinkPacketManager();
                break;
        }
    }

    private void RelinkPacketManager()
    {
        socketConfig.SetBuffer(new byte[1], 0, 1);
        socketConfig.Completed += new EventHandler<SocketAsyncEventArgs>(IdentifyPacket);
        netSocket.ReceiveAsync(socketConfig);
    }

想法？

Answer 1

如果你得到一个Packet.KeepAlive，你会发送另一个请求吗？或者只是等待接收更多数据？如果您需要获取剩余的数据字节，您可能已经在 e.Buffer[0] 之后的字节响应中拥有它。因此，与其事先设置缓冲区大小，不如尝试完全解析您的响应。

希望对您有所帮助。

编辑:试试这个

SocketAsyncEventArgs args;
switch (packet)
        {
            case PacketID.KeepAlive:
                args.SetBuffer(new byte[4], 0, 4);
                args.Completed += new EventHandler<SocketAsyncEventArgs>(HandleKeepAlive);
                e.ConnectSocket.ReceiveAsync(args);
                break;
            default:
                RelinkPacketManager();
                break;
    }