套接字接收数据为空

Question

我正在尝试从连接到我的服务器的应用程序接收数据，但是它将数据发送为空？

//Receive Data
int received = socket.EndReceive(AR);
byte[] dataBuf = new byte[received];
Array.Copy(_buffer, dataBuf, received);
string ReserveText = Encoding.ASCII.GetString(dataBuf);
//Write to Console if no error appears
Console.WriteLine("Message received from client: " + ReserveText);

目前正在打印从客户端收到的消息：，打印后的'ReserveText'是保留测试显然是空的？上面的代码是我的服务器代码，下面我已经分享了完整的void和客户端中的代码。

Full Void：

public void ReceiveCallback(IAsyncResult AR)
{
    Socket socket = (Socket)AR.AsyncState;
    string clientIP = socket.RemoteEndPoint.ToString();
    try
    {
        //Receive Data
        int received = socket.EndReceive(AR);
        byte[] dataBuf = new byte[received];
        Array.Copy(_buffer, dataBuf, received);
        string ReserveText = Encoding.ASCII.GetString(dataBuf);
        //Write to Console if no error appears
        Console.WriteLine("Message received from client: " + ReserveText);

        string ResponceText = "Testing Response";
        byte[] data = Encoding.ASCII.GetBytes(ResponceText);
        //socket.BeginSend(data, 0, data.Length, SocketFlags.None, new AsyncCallback(SendCallback), socket);
        SendAsync(socket, data, 0, data.Length);
        Console.WriteLine("Message sent to client: " + ResponceText);

        socket.BeginReceive(_buffer, 0, _buffer.Length, SocketFlags.None, new AsyncCallback(ReceiveCallback),
            socket);
    }
    catch (Exception)
    {
        Console.WriteLine("Client Disconnected");
        //TODO: DISPOSE THE SOCKET/SESSION FROM _clients
    }
}

以下是客户端SENDING到服务器的方法

public static string SendMessageAndReturnResponse(string req)
{
    byte[] buffer = Encoding.ASCII.GetBytes(req);
    _clientSocket.Send(buffer);

    byte[] receivedBuf = new byte[1024];
    int rec = _clientSocket.Receive(receivedBuf);
    byte[] data = new byte[rec];
    Array.Copy(receivedBuf, data, rec);
    return Encoding.ASCII.GetString(data);
}