Question

I have a list of ids

IEnumerable<long> ids

How can I delete from a table where the ID matches?

Answer 1

The “standard” way according to the MSDN docs is to use those IDs to pull up each of the objects, then delete them with the DeleteObject command:

context.Where(x=>ids.Contains(x.Id)).ToList().ForEach(context.DeleteObject);

This will produce N+1 roundtrips to the DB. This is a common downside of ORMs; they’re excellent at 99% of everyday use of SQL by an app (querying for results, creating/updating/deleting single objects) but are not really designed for these bulk operations.

You could also construct a query using ExecuteStoreCommand, where you "DELETE FROM table WHERE id IN @p1" and specify the list of IDs as a parameter.