套接字错误请求的地址在其上下文中无效

Question

While Trying to Set the SocketOption using :

    listener.SetSocketOption(SocketOptionLevel.IP,
   SocketOptionName.AddMembership, new MulticastOption(ipAddress));

I am getting the following exception ;

The requested address is not valid in its context

My listmer is:

  Socket listener = new Socket(AddressFamily.InterNetwork,
      SocketType.Dgram, ProtocolType.Udp);

and Ip is 3.212.xx

Is this a problem because of IP ?

Answer 1

The Problem is in this statement:

listener.SetSocketOption(SocketOptionLevel.IP,
   SocketOptionName.AddMembership, new MulticastOption(ipAddress));

MSDN outline this constructor as :

public MulticastOption(
    IPAddress group
)

So the MulticastOption looks for a Group to broadcast but I had passed localIP and that was the problem.

I instead I updated my Code:

 IPAddress ip = IPAddress.Parse("224.5.6.7");



Socket _socketServer = new Socket(AddressFamily.InterNetwork, SocketType.Dgram,
            ProtocolType.Udp);
        _socketServer.SetSocketOption(SocketOptionLevel.IP,


SocketOptionName.AddMembership, new MulticastOption(ip));
            _socketServer.SetSocketOption(SocketOptionLevel.IP, 
  SocketOptionName.MulticastTimeToLive, 1);