Using Linq with navigation properties - entity-framework

Question

Trying to use navigation properties in a Linq query and not getting any results. Not sure why.
I'm using the standard Simple Membership tables in SQL Server with Entity Framework. So I've pulled the three tables, AspNetUsers, AspNetRoles and AspNetUserRoles into my model (See pic below)
YES, I KNOW I CAN USE THE ROLE/IDENTITY FUNCTIONS, I AM JUST USING THESE TABLES TO TRY OUT THIS LINQ QUERY, THESE TABLES WERE CONVENIENT TO USE
Anyway, my goal was to use the Navigation properties to get the roles for a given user. AspNetUserRoles does not get pulled into my model as an entity since it has no primary key, so this seemed the right way to go. I tried using the suggestion presented here:
Linq to entities navigation properties
The following linq query returns 0 results
var result = (from r in context.AspNetRoles
where r.AspNetUsers.Any(u => u.Id == UserId)
select r).ToList();
return result;
Thought maybe I needed to use the Include extension so I tried this, also returns 0 results
var result = (from r in context.AspNetRoles
where r.AspNetUsers.Any(u => u.Id == UserId)
select r).Include("AspNetUsers").ToList();
return result;
I know I'm doing something wrong with the line:
where r.AspNetUsers.Any(u => u.Id == UserId)
because if I remove it, I get results but not for a specific user, of course.
I'm trying to follow the advice given in one of the answers here:
Any ideas?
Thanks in advance!

Answer 1

If I understand correctly, you want to get all of a User's roles based on their Id.
Unless there is some information I am missing about your User model, then it is impossible to get this without accessing AspNetUserRoles.
If you can access that table, then this becomes really straightforward:
var result = AspNetUserRoles.Where(role => role.UserId == UserId)
.Select(userRole => AspNetRoles.First(role => role.Id == userRole.RoleId));
Or in query syntax:
var result = from userRole in AspNetUserRoles
where userRole.UserId == UserId
from role in AspNetRoles
where role.Id == userRole.RoleId
select role;