Entity Framework 6 and Asp.Net Identity UserManager: Multiple DbContext

Question

This is MVC 5/ EF6. So I have the following classes:

public class User : IdentityUser
{
    public User()
    {
        Levels = new List();
            


        

Answer 1

If you're using UserManager the way 'it came out of the box' then it's probably instantiated like this:

public AccountController()
: this(new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(new MyDbContext())))
{
}

public AccountController(UserManager<ApplicationUser> userManager)
{
    UserManager = userManager;
}

public UserManager<ApplicationUser> UserManager { get; private set; }

It means that if you don't provide a UserManager instance to the AccountController constructor (and it's probably the case here), a new MyDbContext is created for the UserManager store.

Yet, you have another instance of MyDbContext, as i can infer from this line in your code:

Level level = DBContext.Levels.Where(s => s.Name == model.Level.Name).SingleOrDefault();

All it means is that you have to make your UserManager use the same context:

public AccountController() : this(null)
{
}

public AccountController(UserManager<User> userManager = null)
{
    DBContext = new MyDBContext();

    if (userManager == null)
        userManager = new UserManager<User>(new UserStore<User>(DBContext));

    UserManager = userManager;
}

public UserManager<User> UserManager { get; private set; }
public MyDBContext DBContext;

This way, you're creating the (only) MyDbContext instance first, then passing it to the UserManager constructor (as the IUserStore<User>).

Also, you can definitely make a good use of Dependency Injection here and have the MyDbContext instance injected for you by a DI container and keeping your current code almost unchanged:

public AccountController(MyDBContext context)
: this(new UserManager<User>(new UserStore<User>(context)))
{
    this.DBContext = context;
}

See Tutorial (for Microsoft Unity).