linq to entities, a where in where clause? (inner where)

Question

I have a table with a one to many mapping to a table that has a many to many mapping to another table. I\'d like to do the following:

var results = context.m         


        

Answer 1

from link in db.main_link_table
join s in db.some_table on link.association1 = s.association
join m in db.many_to_many_table on link.association2 = m.association
where s.X = 'MyValue' AND m.Y = 'MyValue'
select m; // or s or link or both 3 as you want

Answer 2

If you want to do a join, why don't you just do a join?

var query = from main in context.MainLinks
            join t1 in context.Some on main.Association equals t1.Association
            where t1.RandomProperty == "MyValue"
            join t2 in context.ManyToMany on t1.Association equals t2.Association
            where t2.RandomProperty == "MyValue"
            select new { main, t1, t2 };

That should achieve exactly what your SQL does...

Answer 3

It should work if you change the inner Where to Any:

var results = context.main_link_table
                     .Where(l => l.some_table.RandomProperty == "myValue" &&
                                 l.some_table.many_to_many_table
                                  .Any(m => m.RandomProperty == "myValue"));