How to do a SQL “Where Exists” in LINQ to Entities?

Question

I really want to do something like this:

Select * 
from A join B on A.key = B.key join C on B.key = C.key -- propagated keys
where exists (select null from B         


        

Answer 1

Have you tried adding your exists conditioning to your joins?

from a in context.AEntity
Join B in context.BEntity on A.Key equals B.Key && B.Name == "Joe"
Join C in context.CEntity on B.Key equals C.Key && C.Name == "Kim";

Not sure if that will work, but worth a shot.

Answer 2

The .Any() extension method typically maps to exists.