Simplify linq statment (Sonar2971)

Question

I have this Linq:

MyCars refCar = m_service.Cars?.ToList().FirstOrDefault(x => x.Id == car.refId);
...
return m_otherService.GetCar(refCar.RefCardId);

SonarCloud is showing: S2971 - "IEnumerable" LINQs should be simplified

How to fix that?

Answer 1

var refCar = m_service.Cars?.FirstOrDefault(x => x.Id == car.refId);
...
return m_otherService.GetCar(refCar?.RefCardId);

If the GetCar method handles null values. Otherwise, pass a new empty object.