c# - 确定缓冲区应该有多大

Question

我正在从一个 tcp 流中读取 - 我已经使用“MLSD”命令(检索文件/目录信息)查询了一个 FTP 服务器。虽然由于响应大小是可变的(取决于文件/目录等的数量)，但我不确定“缓冲区”应该设置多少字节。如何确保通过 tcp 流从 FTP 服务器检索到所有数据？

 private string controlListener(int controlPort)
        {
            try
            {
                // Create a TcpClient. 
                // Note, for this client to work you need to have a TcpServer  
                // connected to the same address as specified by the server, port 
                // combination.
                controlClient = new TcpClient(ftpHost, controlPort);

                // Get a client stream for reading and writing. 
                controlStream = controlClient.GetStream();

                    // Because we don't know how many bytes are incoming for welcome message - we use a 2 second delay to retrieve all bytes within that time frame.
                    // Receive the TcpServer.response. 
                    // Buffer to store the response bytes.
                    Byte[] data = new Byte[4096];

                    // String to store the response ASCII representation.
                    String responseData = String.Empty;

                    // Get Control Stream Responce: Read the first batch of the TcpServer response bytes.
                    Int32 bytes = controlStream.Read(data, 0, data.Length);
                    responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes);
                    Console.WriteLine(responseData);

                    return responseData;
            }

Answer 1

在 Mark 的回答之后......我使用了这个方法，你应该很容易看到如何合并它。

    /// <summary>
    /// Read TCP response, this simple method can be re-used elsewhere as needed later.
    /// </summary>
    /// <returns></returns>
    private static string ReadResponse(NetworkStream networkStream)
    {
        // Check to see if this NetworkStream is readable.
        if (networkStream.CanRead)
        {
            var myReadBuffer = new byte[256]; // Buffer to store the response bytes.
            var completeMessage = new StringBuilder();

            // Incoming message may be larger than the buffer size.
            do
            {
                var numberOfBytesRead = networkStream.Read(myReadBuffer, 0, myReadBuffer.Length);
                completeMessage.AppendFormat("{0}", Encoding.ASCII.GetString(myReadBuffer, 0, numberOfBytesRead));
            } while (networkStream.DataAvailable);

            return completeMessage.ToString();
        }
        return null;
    }