public void RemoveSessionCallbackParameter(string key) { if (_activityHandler != null) { _activityHandler.RemoveSessionCallbackParameter(key); return; } if (_preLaunchActions == null) { _preLaunchActions = new List <Action <ActivityHandler> >(); } _preLaunchActions.Add((activityHandler) => { activityHandler.RemoveSessionCallbackParameterI(key); }); }