Linq-to-SQL EntitySet Is Not IQueryable — Any Workarounds?

Question

When you query an EntitySet property on a model object in Linq-to-SQL, it returns all rows from the entityset and does any further querying client-side.

This is confir

Answer 1

I had a similar problem: How can I make this SelectMany use a join. After messing with LINQPad for a good amount of time I found a decent workaround. The key is to push the EntitySet you are looking at inside a SelectMany, Select, Where, etc. Once it's inside that it becomes an Expression and then the provider can turn it into a proper query.

Using your example try this:

var query = from c in Children
            where c == myChild
            from p in c.Parents
            where p.Age > 35
            select p;

I'm not able to 100% verify this query as I don't know the rest of your model. But the first two lines of the query cause the rest of it to become an Expression that the provider turns into a join. This does work with my own example that is on the question linked to above.