无法通过edmx和LinQ中的Include获得相关表

Question

Now I have 3 tables:

tbl_User: UserID, UserName

tbl_Role: RoleID, RoleName

tbl_UserRole: UserID, RoleID

The relationship is: tbl_User - tbl_UserRole - tbl_Role (1 User for many Role, and 1 Role for many User)

in edmx, I tried to use like this:

var users =
    ((from u in DbContext.tbl_User
    join ur in DbContext.tbl_UserRole on u.UserID equals ur.UserID
    join r in DbContext.tbl_Role on ur.RoleID equals r.RoleID
    select u) as ObjectQuery<tbl_User>).Include("tbl_UserRole").Include("tbl_Role");

What I need to get information of tbl_User and RoleName (in tbl_Role). How can I do that?

Please advise. Thanks.

Answer 1

If you're simply just trying to get a users with their roles, can you not just:

var users = DbContext.tbl_User.Include("tbl_Role")

Without a clearer picture of your entity relationships, I'm going to assume that this will work. If you were to show the entity classes or a picture of your EDMX designer then a more relevant answer might be posted

Edit: Assuming the above code fetched you your users, you could access the roles as follows:

users.First().tbl_role.Select(x => x.RoleName);