/*
         private bool ContainsServicesWithFilter(SsdpDevice device, String filter)
         {
             //  TODO  Implement this method.  Not sure why needs to happen since there are now required services.
             return true;
         }
 */
 public void AddListener(IDiscoveryProviderListener listener)
 {
     serviceListeners.Add(listener);
 }
 public void RemoveListener(IDiscoveryProviderListener listener)
 {
     serviceListeners.Remove(listener);
 }