Error when trying to "where" on strongly typed list, error CS0103

Question

I've got linq which joins two lists by id and returns strongly typed List:

   List<TestowaKlasaDlaLinq> linqlambda = ListDetailedData.Join(PlacesList, a => a.place.id, b => b.id, (a, b) =>
                new TestowaKlasaDlaLinq()
                {
                    Czas = a.startDate.TimeOfDay.ToString(),
                    Co = a.name,
                    Miasto = b.address.city,
                    Miejsce = a.organizer.designation
                }).ToList();

For now everything works. Problem appeared when I tried to filter that list e.g.:

   var onlyGdansk = linqlambda.Where(x => x.Miasto.Equals("Gdańsk")).Select(x => x).ToList();

That error came out:

How is this possible that strongly field of strongly typed List of type "TestowaKlasaDlaLinq" doesnt exist in that context?

Answer 1

I think, One of the x.Miasto value is null and that is the reason, it shows you this error.

var onlyGdansk = linqlambda.Where(tkdl => tkdl.Miasto!=null && tkdl.Miasto.Equals("Gdańsk")).Select(dl => dl).ToList();