我用C＃和Tcp服务器编写了一个带有C的Tcp客户端在TCP服务器端，我通过循环接收数据：

unsigned char* buffer = new unsigned char[BUFFERSIZE];
   int pLen =0;
   int recievedLen = 0;
   do{
          recievedLen = OnReadData(0, clientSock,buffer,&pLen,1000);
          printBytes(buffer,recievedLen);
   }while(recievedLen>0);

在TCP客户端，我发送一些数据并收到响应：

private void Send(string data)
    {
        NetworkStream stream = tcpClient.GetStream();
        byte[] writeBuffer = Encoding.ASCII.GetBytes(data);
        stream.Write(writeBuffer, 0, writeBuffer.Length);
        Console.WriteLine("写入数据:" + Encoding.ASCII.GetString(writeBuffer));
    }

    private void Receive()
    {
        NetworkStream stream = tcpClient.GetStream();
        var readBuffer = new byte[2048];
        while (!stream.DataAvailable)
        {
            Thread.Sleep(1);
        }

        int writeCount = stream.Read(readBuffer, 0, readBuffer.Length);
        String content = Encoding.ASCII.GetString(readBuffer, 0, writeCount);
        Console.WriteLine("读取数据:" + content);
    }

问：当我只是发送数据而不在TCP客户端调用接收数据时，在TCP服务器端接收数据的循环可以完成和谐 . 但是当调用Send函数然后在TCP客户端调用Receive Function时，TCP Server端的 recv 函数将在第二次被阻塞（预期结果是接收0字节） . 任何人都可以解释一下吗？谢谢

winsock recv