Question

how can i write “in( select” method in linq?

I’m trying to convert :

UPDATE ActualAmountsByLocation SET isCustomerItem=1 WHERE ItemBarcode IN (SELECT barcode FROM StockMaterials WHERE barcode=@Barcode AND ownership=1)

I’ve tried like this:

    Array stockMaterials = ( from s in stockMovementCtx.StockMaterials where s.barcode == Barcode && s.ownership ==1 select s).ToArray();
                           actualAmountsByLocation = (from a in stockMovementCtx.ActualAmountsByLocations
                                                       where a.ItemBarcode.Contains(stockMaterials)
                                                      select a).First();

Answer 1

To get an IN query you need to reverse the sense of the contains. Also, no need to materialize the first query, IMO.

var stockMaterials = from s in stockMovementCtx.StockMaterials
                     where s.barcode == Barcode && s.ownership ==1
                     select s;
actualAmountsByLocation = (from a in stockMovementCtx.ActualAmountsByLocations
                           where stockMaterials.Contains( a.ItemBarcode)
                           select a).First();