Long? Does not contains defintion for extension method best extension overload method querable.conatains<long? >

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Error:
long? does not contains defintion for extension method best extension overload method Querable.conatains<long?>

C#

var _OrderResponse = (await _tagProvider.GetBaseOrderAsync(new GetBaseOrderRequest() { })).BaseObjects.Where(b => b.CustomerId.Contains(request.customerId)).ToList();

Please help me.
Thank u

What I have tried:

Error:
long? does not contains defintion for extension method best extension overload method Querable.conatains<long?>

C#

var _OrderResponse = (await _tagProvider.GetBaseOrderAsync(new GetBaseOrderRequest() { })).BaseObjects.Where(b => b.CustomerId.Contains(request.customerId)).ToList();

Posted 27-Nov-18 2:07am

Krishna Veni

Updated 27-Nov-18 2:26am

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Mehdi Gholam · Answer 1 · 2018-11-27T02:20:00

Solution 1

Contains() only applies to strings not numbers.

Try b => b.CustomerId == request.customerId

Posted 27-Nov-18 2:20am

Mehdi Gholam

OriginalGriff · Answer 2 · 2018-11-27T02:27:00

Contains applies to collections and strings (which are collections of characters).
A long cannot be iterated over either directly via a foreach or by using Linq methods as it is not a collection and does not implement the IEnumerable interface: Enumerable.Contains Method (System.Linq) | Microsoft Docs[^]