Question

In my database i have table what contains a file name pattern.

Pattern in database:

PKO??_??_??????_*.TXT

File name:

PKO10_11_123456_example.TXT

Now when some file is imported to my program i need to match it against these patterns in database. I know that Directory.GetFiles() has this option to add the pattern and it give back all the files what will match with this patter. Is there a way i can do that in LINQ query? I tried Containes() like this:

 var _cardType = (from type in context.OCA_CARD_TYPEs
     where type.FILENAME.ToLower().Contains(fileName.ToLower())
     select type).Single();

But like that i didnt get any match.

Answer 1

where System.Data.Linq.SqlClient.SqlMethods.Like(
         type.FILENAME.ToUpper(), filename, '\\')

with filename as @"PKO__\___\_______\_%.TXT"

and note that the \_ are the literal _ (escaped via the \ character we specified) – the _ and % are the LIKE wildcards akin to ? and * respectively.