Join between in memory collection and EntityFramework

Question

Is there any mechanism for doing a JOIN between an in-memory collection and entity framework while preserving the order.

What I am trying is

var ite         


        

Answer 1

No you cannot join in-memory collection with database result set without loading whole result set to the memory and performing the join with linq-to-objects. Try using contains instead of join:

var myNumbers = myInMemoryList.Select(i => i.RECORD_NUMBER);
var itemsToAdd = efRepo.Where(e => myNumbers.Contains(e.RECORD_NUMBER));

This will generate query with IN operator