bool alreadyExist = __activeAppEventListenerList.Contains(&listener);
SysTryReturnResult(NID_APP, !alreadyExist, E_OBJ_ALREADY_EXIST, "The event listener already exist.");
result r = __activeAppEventListenerList.Add(&listener);
bool alreadyExist = __activeAppEventListenerList.Contains(&listener);
SysTryReturnResult(NID_APP, !alreadyExist, E_OBJ_ALREADY_EXIST, "The event listener already exist.");
result r = __activeAppEventListenerList.Add(&listener);