public ContactCreatedEventHandler(ISignalRTransmitterService signalRTransmitterService) { _signalRTransmitterService = signalRTransmitterService ?? throw new ArgumentNullException(nameof(signalRTransmitterService)); }
public ContactDeletedEventHandler(ISignalRTransmitterService signalRTransmitterService) { _signalRTransmitterService = signalRTransmitterService; }