private void NetworkWatcher(object state)
{
try
{
List <IPAddress> currentBroadcastIPs = NetUtilities.GetBroadcastIPList();
List <IPAddress> newIPs = new List <IPAddress>();
lock (_broadcastIPs)
{
foreach (IPAddress currentIP in currentBroadcastIPs)
{
if (!_broadcastIPs.Contains(currentIP))
{
newIPs.Add(currentIP);
}
}
_broadcastIPs.Clear();
_broadcastIPs.AddRange(currentBroadcastIPs);
}
BroadcastNetworkDiscovered(newIPs.ToArray());
}
catch
{ }
finally
{
if (_networkWatcher != null)
{
_networkWatcher.Change(NETWORK_WATCHER_INTERVAL, Timeout.Infinite);
}
}
}
public Listener(int listenerPort)
{
_listenerPort = listenerPort;
_udpListener = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
_udpListener.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, 1);
_udpListener.Bind(new IPEndPoint(0, listenerPort));
_listeningThread = new Thread(RecvDataAsync);
_listeningThread.IsBackground = true;
_listeningThread.Start();
_broadcastIPs = NetUtilities.GetBroadcastIPList();
_networkWatcher = new Timer(NetworkWatcher, null, NETWORK_WATCHER_INTERVAL, Timeout.Infinite);
}