Tutor.com Classroom How-To #2: connecting to a TCP/IP Listener

These How-To tips are taken from The Tutor.com Classroom: Architecture and techniques using Silverlight, WPF, and the Microsoft .NET Framework.

You can check out the Silverlight Tutor.com Classroom in "practice" mode, although the real experience is with a live tutor on the other side!

Using the Socket class, we just need to create a SocketAsyncEventArgs and call ConnectAsync(). Notice an example of the “#if WPF” directive for subtle Silverlight/WPF differences (as described in the "Code Sharing" post) when we set the SocketAsyncEventArgs RemoteEndPoint.

public void Connect(string host, int port)
{
  //instantiate socket
  m_Socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

  //set up endpoint
#if WPF
    m_SocketSendArgs.RemoteEndPoint = new IPEndPoint(Dns.GetHostAddresses(host)[0], port);
#else
    m_SocketSendArgs.RemoteEndPoint = new DnsEndPoint(host, port);
#endif

  //set up args
  SocketAsyncEventArgs args = new SocketAsyncEventArgs();

  args.UserToken = m_Socket;
  args.RemoteEndPoint = m_SocketSendArgs.RemoteEndPoint;
  args.Completed += new EventHandler(OnConnect);

  m_Socket.ConnectAsync(args);
}