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 lt ApplicationUser gt   userManager   HttpPost   Authorize  public async Task lt IActionResult gt  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

User · Accepted Answer

Assuming your code is inside an MVC controller:

public class MyController : Microsoft.AspNetCore.Mvc.Controller

From the Controller base class, you can get the IClaimsPrincipal 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:

Get the user manager using dependency injection

private UserManager<ApplicationUser> _userManager;

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

And use it:

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

User · Answer

In  NET Core 2 0 the user already exists as part of the underlying inherited controller  Just use the User as you would normally or pass across to any repository code    Authorize AuthenticationSchemes   JwtBearerDefaults AuthenticationScheme  Policy    TENANT     HttpGet  issue-type-selection    Produces  application json    public async Task lt IActionResult gt  IssueTypeSelection         try               return new ObjectResult await  item IssueTypeSelection User              catch  ExceptionNotFound                Response StatusCode    int HttpStatusCode BadRequest          return Json new                       error    invalid grant               error description    Item Not Found                        This is where it inherits it from   region Assembly Microsoft AspNetCore Mvc Core  Version 2 0 0 0  Culture neutral  PublicKeyToken adb9793829ddae60    C  Users BhailDa  nuget packages microsoft aspnetcore mvc core 2 0 0 lib netstandard2 0 Microsoft AspNetCore Mvc Core dll  endregion  using System  using System IO  using System Linq Expressions  using System Runtime CompilerServices  using System Security Claims  using System Text  using System Threading Tasks  using Microsoft AspNetCore Authentication  using Microsoft AspNetCore Http  using Microsoft AspNetCore Mvc ModelBinding  using Microsoft AspNetCore Mvc ModelBinding Validation  using Microsoft AspNetCore Routing  using Microsoft Net Http Headers   namespace Microsoft AspNetCore Mvc                 Summary             A base class for an MVC controller without view support       Controller      public abstract class ControllerBase               protected ControllerBase                           Summary                 Gets the System Security Claims ClaimsPrincipal for user associated with the                executing action          public ClaimsPrincipal User   get

User · Answer

For context  I created a project using the ASP NET Core 2 Web Application template  Then  select the Web Application  MVC  then hit the Change Authentication button and select Individual User accounts   There is a lot of infrastructure built up for you from this template   Find the ManageController in the Controllers folder     This ManageController class constructor requires this UserManager variable to populated   private readonly UserManager lt ApplicationUser gt   userManager    Then  take a look at the the  HttpPost  Index method in this class   They get the current user in this fashion   var user   await  userManager GetUserAsync User     As a bonus note  this is where you want to update any custom fields to the user Profile you ve added to the AspNetUsers table   Add the fields to the view  then submit those values to the IndexViewModel which is then submitted to this Post method   I added this code after the default logic to set the email address and phone number   user FirstName   model FirstName  user LastName   model LastName  user Address1   model Address1  user Address2   model Address2  user City   model City  user State   model State  user Zip   model Zip  user Company   model Company  user Country   model Country  user SetDisplayName    user SetProfileID      dbContext Attach user  State   EntityState Modified   dbContext SaveChanges

User · Answer

Just if any one is interested this worked for me  I have a custom Identity which uses int for a primary key so I overrode the GetUserAsync method   Override GetUserAsync  public override Task lt User gt  GetUserAsync ClaimsPrincipal principal        var userId   GetUserId principal       return FindByNameAsync userId       Get Identity User   var user   await  userManager GetUserAsync User     If you are using a regular Guid primary key you don t need to override GetUserAsync  This is all assuming that you token is configured correctly   public async Task lt string gt  GenerateTokenAsync string email        var user   await  userManager FindByEmailAsync email       var tokenHandler   new JwtSecurityTokenHandler        var key   Encoding ASCII GetBytes  tokenProviderOptions SecretKey        var userRoles   await  userManager GetRolesAsync user       var roles   userRoles Select o   gt  new Claim ClaimTypes Role  o         var claims   new                 new Claim JwtRegisteredClaimNames Sub  user UserName           new Claim JwtRegisteredClaimNames Jti  Guid NewGuid   ToString             new Claim JwtRegisteredClaimNames Iat  DateTime UtcNow ToString CultureInfo CurrentCulture            new Claim JwtRegisteredClaimNames GivenName  user FirstName           new Claim JwtRegisteredClaimNames FamilyName  user LastName           new Claim JwtRegisteredClaimNames Email  user Email              Union roles        var tokenDescriptor   new SecurityTokenDescriptor               Subject   new ClaimsIdentity claims           Expires   DateTime UtcNow AddHours  tokenProviderOptions Expires           SigningCredentials   new SigningCredentials new SymmetricSecurityKey key   SecurityAlgorithms HmacSha256Signature              var token   tokenHandler CreateToken tokenDescriptor        return Task FromResult new JwtSecurityTokenHandler   WriteToken token   Result

User · Answer

private readonly UserManager lt AppUser gt   userManager    public AccountsController UserManager lt AppUser gt  userManager                  userManager   userManager       Authorize Policy    ApiUser     HttpGet  api accounts GetProfile   Name    GetProfile    public async Task lt IActionResult gt  GetProfile        var userId     ClaimsIdentity User Identity  FindFirst  Id   Value     var user   await  userManager FindByIdAsync userId       ProfileUpdateModel model   new ProfileUpdateModel       model Email   user Email     model FirstName   user FirstName     model LastName   user LastName     model PhoneNumber   user PhoneNumber      return new OkObjectResult model

User · Answer

I have put something like this in my Controller class and it worked   IdentityUser user   await userManager FindByNameAsync HttpContext User Identity Name     where userManager is an instance of Microsoft AspNetCore Identity UserManager class  with all weird setup that goes with it

User · Answer

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

[c#] ASP.NET Core Identity - get current user

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