Question

I have a List<int> ListOfIDs containing some numbers which are IDs.

I have a List<CustomClass> ListOfObjects containing some objects, which properties reflecting their IDs.

I’ve searched high and low for a Linq query that will allow me to return from my List a sublist of only those objects which have an ID that is contained within the List.

My attempt does not compile and I cannot seem to correct the syntax :

List<CustomClass> SubList = ListOfObjects.Where(ListOfIDs.Contains(p => p.ID))

Thanks very much.

Answer 1

I think you want to do like this?

List<CustomClass> SubList = ListOfObjects
        .Where(obj => ListOfIDs.Contains(obj.ID))
        .ToList();