ASP.NET Core Identity - get current user

Question

To get the currently logged in user in MVC5, all we had to do was:

using Microsoft.AspNet.Identity; [Authorize] public IHttpActionResult DoSomething() {     string currentUserId = User.Identity.GetUserId(); } 

Now, with ASP.NET Core I thought this should work, but it throws an error.

using Microsoft.AspNetCore.Identity; using Microsoft.AspNetCore.Http;  private readonly UserManager<ApplicationUser> _userManager; [HttpPost] [Authorize] public async Task<IActionResult> StartSession() {     var curUser = await _userManager.GetUserAsync(HttpContext.User); } 

Any ideas?

EDIT: Gerardo's response is on track but to get the actual "Id" of the user, this seems to work:

ClaimsPrincipal currentUser = this.User; var currentUserID = currentUser.FindFirst(ClaimTypes.NameIdentifier).Value; 

Answer 1

If your code is inside an MVC controller:

public class MyController : Microsoft.AspNetCore.Mvc.Controller 

From the Controller base class, you can get the ClaimsPrincipal from the User property

System.Security.Claims.ClaimsPrincipal currentUser = this.User; 

You can check the claims directly (without a round trip to the database):

bool isAdmin = currentUser.IsInRole("Admin"); var id = _userManager.GetUserId(User); // Get user id: 

Other fields can be fetched from the database's User entity:

1. Get the user manager using dependency injection

   private UserManager<ApplicationUser> _userManager;  //class constructor public MyController(UserManager<ApplicationUser> userManager) {     _userManager = userManager; } 

2. And use it:

   var user = await _userManager.GetUserAsync(User); var email = user.Email; 

If your code is a service class, you can use dependency injection to get an IHttpContextAccessor that lets you get the User from the HttpContext.

    private IHttpContextAccessor _httpContextAccessor;      public MyClass(IHttpContextAccessor httpContextAccessor)     {         _httpContextAccessor = httpContextAccessor;     }      private void DoSomething()     {         var user = _httpContextAccessor.Context?.User;     } 

Answer 2

If you are using Bearing Token Auth, the above samples do not return an Application User.

Instead, use this:

ClaimsPrincipal currentUser = this.User; var currentUserName = currentUser.FindFirst(ClaimTypes.NameIdentifier).Value; ApplicationUser user = await _userManager.FindByNameAsync(currentUserName); 

This works in apsnetcore 2.0. Have not tried in earlier versions.