c# - Update to Azure Notification hub tags fails when tags list is empty -


i've made notification hub on microsoft azure in order send notification both in android , ios. problem when phone registers in tags , removes them, still receiving notifications tags have been removed. seems when send empty (not null) list, update fails. ideas?

here on register code:

protected override void onregistered (context context, string registrationid)     {         log.verbose (mybroadcastreceiver.tag, "gcm registered: " + registrationid);         registrationid = registrationid;          hub = new notificationhub (constants.notificationhubname, constants.listenconnectionstring,                                     context);         try {             hub.unregisterall (registrationid);         } catch (exception ex) {             log.error (mybroadcastreceiver.tag, ex.message);         }          saveandload_droid load = new saveandload_droid ();         string output_settings = load.loadtext ("settings.txt");          string [] categories = output_settings.split ('@');          var notnullcategories = categories.where (x => x != "0").tolist();          try {             var hubregistration = hub.register (registrationid, notnullcategories.toarray ());         } catch (exception ex) {             log.error (mybroadcastreceiver.tag, ex.message);         }     }

the setting.txt file looks like: 5@12@9


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