User.Identity.GetUserId() return null

Question

Based on this article and the source code in github associated with this tutorial I am trying to implement a mvc application where users have individual resources.

I have the authorize attribute on my controller and if I am not logged in I will be redirected to the login page. I can see my user name on the top of the page so I assume things are fine. But then I try a create action on another controller and finds that currentUser is null.

This seem to happen in a random way which makes it very frustrating. But lately only failing.

Could it be something with creation of the database? I'm using Code First.

 [Authorize] public class ShopsController : Controller { private ApplicationDbContext db; private UserManager<ApplicationUser> manager; public ShopsController() { db = new ApplicationDbContext(); manager = new UserManager<ApplicationUser>(new UserStore<ApplicationUser>(db)); } // GET: Shops public ActionResult Index() { var currentUser = manager.FindById(User.Identity.GetUserId()); var shops = db.Shops.ToList().Where(shop => shop.Owner.Id == currentUser.Id); return View(shops); }

Hmm I wonder if your models are out of sync with the db. Do you get this when you've updated your entity models? — heymega
– heymega, Commented May 14, 2015 at 12:12
Also, why are you calling manager.FindById and returning the user entity if you're only going use the ID in next query? Seems like pointless db call... — heymega
– heymega, Commented May 14, 2015 at 12:16
I can usually get it to work by making sure i log out, close the solution, delete the database. I found out i was deleting the database every time in initiliazer. This i changed to DropCreateDatabaseIfModelChanges. About the other comment, have not thought about that, just using the sample code, get things to work, then hopefully understand it. — Jepzen
– Jepzen, Commented May 14, 2015 at 12:23

N_E · Accepted Answer · 2015-12-02 21:09:57Z

try this code (Note: the cast to string):

 User.Identity.GetUserId<string>()

since my ID column in database was Id nvarchar(128),not null without cast i was receiving null but after cast it was giving me the expected GUID

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