public void SetAdditionalServices(IEnumerable <AdditionalService> newAdditionalServices)
{
var existingAdditionalServices = AppointmentAdditionalServices
.Select(service => service.AdditionalService)
.ToArray();
var removedAppointmentServices = existingAdditionalServices.Except(newAdditionalServices)
.Select(additionalService =>
AppointmentAdditionalServices.Single(join => join.AdditionalService.Id == additionalService.Id))
.ToArray();
var addedServices = newAdditionalServices.Except(existingAdditionalServices)
.Select(additionalService => new AppointmentAdditionalService(additionalService, this))
.ToArray();
AppointmentAdditionalServices.RemoveRange(removedAppointmentServices);
AppointmentAdditionalServices.AddRange(addedServices);
}
