Linq query list contains a list?

I think you want either: ListObjectB. Where(p => p.ListOfObjectA. Any(x => ListOfIdsA.

Contains(x. Id))) or ListObjectB. Where(p => p.ListOfObjectA.

All(x => ListOfIdsA. Contains(x.Id))) (You may well want to make ListOfIdsA a HashSet.

I think you want either: ListObjectB. Where(p => p.ListOfObjectA. Any(x => ListOfIdsA.

Contains(x. Id))) or ListObjectB. Where(p => p.ListOfObjectA.

All(x => ListOfIdsA. Contains(x.Id))) (You may well want to make ListOfIdsA a HashSet if it's of significant size, btw. ).

Learn something new every day...for some reason I was thinking Extension methods were the way to solve this one. – Justin Niessner Mar 2 '10 at 15:12 I want it any of them. Thx for the prompt response (it was my first question in here, and damn, that was fast!) – Berto Mar 2 '10 at 15:21 @Justin: Well Where, All and Any are extension methods :) – Jon Skeet Mar 2 '10 at 15:35 Doh!

Poorly worded comment. I was referring to hand rolling my own Extension Methods. – Justin Niessner Mar 2 '10 at 16:04 1 @BZ: That's already what the query is doing.

I think another question (with a short but complete example) probably would be useful, yes. – Jon Skeet Mar 2 '107 at 5:20.

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