错误 CS1929“int[]”不包含“Contains”的定义

Question

Error CS1929 'int[]' does not contain a definition for 'Contains' and the best extension method overload 'Queryable.Contains(IQueryable, int?)' requires a receiver of type 'IQueryable

once i try to run the code this error comes out , i dont know how to fix it. this is the code

public void SendModelPallet(string IDs, StorageContext db)
        {
           int[] ids = ViewModelsUtils.processIDs(IDs);
           PalletBoxes = db.ExternStoragePlaces.Where(c => ids.Contains(c.PalletPlaceID)).ToList();
            this.db = db;
        }

Thanks in advance

Answer 1

Just a guess here, but I remember having had problems with nulll coalescing in some Linq to SQL queries. I recommend you to try to declare your ids array as this :

int?[] ids = ViewModelsUtils.processIDs(IDs);

(use int?[] instead of int[] so this will match the type of your field)

Not sure about this, first because it doesn't seem to match the compilation error message, and secondly because I don't have a way to test this for the moment.

Answer 2

Had the same issue while using Delegates[] and used to get the CS1929: 'Delegate?[]' does not contain a definition for 'Contains'

Just included the System.Linq namespace and works fine now.