Question

Type ‘System.Net.Sockets.Socket’ cannot be serialized. Consider marking it with the DataContractAttribute attribute, and marking all of its members you want serialized with the DataMemberAttribute attribute.

I am making a service in WCF which opens connection and send message to server but above error is given when i run the service . I do not know how to mark it with data contract attribute or how to solve the problem.

public class Service1 : IService1
{


    public void Connect(String a , String b)
    {

        int hit = Convert.ToInt32(a);

        int delay = Convert.ToInt32(b);
        delay = delay * 1000; 

 // I have eliminated the log making part       string LogPath = "C:\\VoltTestApp\\Logs\\";


        for (int i = 1; i <= hit; i++)
        {

            try
            {
                TcpClient tcpClient = new TcpClient("10.111.13.72", 80);
                Console.WriteLine("Initialized Socket  .............\n");
                Socket socket = tcpClient.Client;
                string str = "ID_T$";

                try
                { // sends the text with timeout 10s
                    Console.WriteLine("Going To Send Request  .............\n");
                    Send(socket, Encoding.UTF8.GetBytes(str.Trim()), 0, str.Length, 10000);
               }


                socket.Close();
                tcpClient.Close();
                Console.WriteLine("Socket Closed  .............\n");
            }

            Thread.Sleep(delay);
        }

    }



    public  void Send(Socket socket, byte[] buffer, int offset, int size, int timeout)
    {
        try
        {
            int startTickCount = Environment.TickCount;
            int sent = 0;  // how many bytes is already sent
            do
            {
                if (Environment.TickCount > startTickCount + timeout)
                    throw new Exception("Timeout.");
                try
                {
                    sent += socket.Send(buffer, offset + sent, size - sent, SocketFlags.None);
                }
                catch (SocketException ex)
                {
                    if (ex.SocketErrorCode == SocketError.WouldBlock ||
                        ex.SocketErrorCode == SocketError.IOPending ||
                        ex.SocketErrorCode == SocketError.NoBufferSpaceAvailable)
                    {
                        // socket buffer is probably full, wait and try again
                        Thread.Sleep(30);
                    }
                    else
                        throw ex;  // any serious error occurr
                }
            } while (sent < size);
        }

    }

Answer 1

In this instance, it’s probably because you have a public method on your service which takes a Socket as a parameter. This is, quite naturally, not able to be serialized properly when attempting service discovery.

If Send is only used internally, set it as private.