how can I get Identity UserID in the controller right after a successful login result?

Question

I am using Identity v2 and MVC 5 for external login.

In my external login callback function, I log the user in with

var result = await SignInManager.ExternalSignInAsync(loginInfo, isPersistent: false);

then there is a switch for the result, and I need to access the user's ID in the success case, but User.Identity.GetUserId(); gives me null here.

How can I access the User's ID in this case?

Answer 1

To get claims data and other information about the signed in identity immediately upon a successful login, without going to the database, just access signinManager.AuthenticationManager.AuthenticationResponseGrant.Identity.

For instance,

switch (result) { case SignInStatus.Success: var userId = signinManager.AuthenticationManager.AuthenticationResponseGrant .Identity.GetUserId(); // ...

You can also see it being used in this other question's answer to add new claims to an identity immediately after login - AuthenticationManager.AuthenticationResponseGrant.Identity.AddClaims(freshClaims);

Answer 2

I use System.Security.Claims.ClaimTypes.NameIdentifier object to keep my user id

And I created a helper class to reach the values in it

public class UserHelper
  {
    public static string GetUserId()
    {
      var identity = (System.Security.Claims.ClaimsPrincipal)System.Threading.Thread.CurrentPrincipal;
      var principal = System.Threading.Thread.CurrentPrincipal as System.Security.Claims.ClaimsPrincipal;
      var userId = identity.Claims.Where(c => c.Type == System.Security.Claims.ClaimTypes.NameIdentifier).Select(c => c.Value).SingleOrDefault();
      return userId;
    }
    public static string GetUserName()
    {
      var identity = (System.Security.Claims.ClaimsPrincipal)System.Threading.Thread.CurrentPrincipal;
      var principal = System.Threading.Thread.CurrentPrincipal as System.Security.Claims.ClaimsPrincipal;
      var name = identity.Claims.Where(c => c.Type == System.Security.Claims.ClaimTypes.Name).Select(c => c.Value).SingleOrDefault();
      return name;
    }
    public static string GetUserMail()
    {
      var identity = (System.Security.Claims.ClaimsPrincipal)System.Threading.Thread.CurrentPrincipal;
      var principal = System.Threading.Thread.CurrentPrincipal as System.Security.Claims.ClaimsPrincipal;
      var mail = identity.Claims.Where(c => c.Type == System.Security.Claims.ClaimTypes.Email).Select(c => c.Value).SingleOrDefault();
      return mail;
    }
  }

and I call it with

var user = UserHelper.GetUserId();