How to get the current logged in user Id in ASP NET Core

Question

I ve done this before with MVC5 using User Identity GetUserId   but that doesn t seem to work here  The User Identity doesnt have the GetUserId   method   I am using Microsoft AspNet Identity

User · Answer

use can use   string userid   User FindFirst  id   Value    for some reason NameIdentifier now retrieve the username   net core 2 2

User · Answer

For ASP NET 5 0  I have an extension method as follow  using System  using System ComponentModel  using System Security Claims   namespace YOUR PROJECT Presentation WebUI Extensions       public static class ClaimsPrincipalExtensions               public static TId GetId lt TId gt  this ClaimsPrincipal principal                        if  principal    null    principal Identity    null                      principal Identity IsAuthenticated                                throw new ArgumentNullException nameof principal                               var loggedInUserId   principal FindFirstValue ClaimTypes NameIdentifier                if  typeof TId     typeof string                      typeof TId     typeof int                      typeof TId     typeof long                      typeof TId     typeof Guid                                 var converter   TypeDescriptor GetConverter typeof TId                     return  TId converter ConvertFromInvariantString loggedInUserId                              throw new InvalidOperationException  quot The user id type is invalid  quot                       public static Guid GetId this ClaimsPrincipal principal                        return principal GetId lt Guid gt                        So you can use it like  using Microsoft AspNetCore Mvc  using YOUR PROJECT Presentation WebUI Extensions   namespace YOUR PROJECT Presentation WebUI Controllers       public class YourController  Controller               public IActionResult YourMethod                            If it s Guid             var userId   User GetId                    Or                var userId   User GetId lt int gt                  return View

User · Answer

in the APiController  User FindFirst ClaimTypes NameIdentifier  Value   Something like this you will get the claims

User · Answer

In  net core 3 1  and other more recent versions   you can use  private readonly UserManager lt IdentityUser gt   userManager   public ExampleController UserManager lt IdentityUser gt  userManager         userManager   userManager     Then  string userId    userManager GetUserId User    Or async  var user   await  userManager GetUserAsync User   var userId   user Id   At this point  I m trying to figure out why you d use one over the other  I know the general benefits of async  but see both of these used frequently  Please post some comments if anyone knows

User · Answer

As an administrator working on other people s profile and you need to get the Id of the profile you are working on  you can use a ViewBag to capture the Id e g ViewBag UserId   userId  while userId is the string Parameter of the method you are working on        HttpGet       public async Task lt IActionResult gt  ManageUserRoles string userId                   ViewBag UserId   userId            var user   await userManager FindByIdAsync userId            if  user    null                        ViewBag ErrorMessage     User with Id    userId  cannot be found               return View  NotFound                       var model   new List lt UserRolesViewModel gt              foreach  var role in roleManager Roles                        var userRolesViewModel   new UserRolesViewModel                               RoleId   role Id                  RoleName   role Name                             if  await userManager IsInRoleAsync user  role Name                                 userRolesViewModel IsSelected   true                            else                               userRolesViewModel IsSelected   false                             model Add userRolesViewModel                     return View model

User · Answer

For  NET Core 2 0 Only The following is required to fetch the UserID of the logged-in User in a Controller class   var userId   this User FindFirstValue ClaimTypes NameIdentifier     or  var userId   HttpContext User FindFirstValue ClaimTypes NameIdentifier     e g   contact OwnerID   this User FindFirstValue ClaimTypes NameIdentifier

User · Answer

User Identity GetUserId     does not exist in asp net identity core 2 0  in this regard  i have managed in different way  i have created a common class for use whole application  because of getting user information   create a common class PCommon  amp  interface IPCommon  adding reference using System Security Claims  using Microsoft AspNetCore Http  using System  using System Collections Generic  using System Linq  using System Security Claims  using System Threading Tasks   namespace Common Web Helper       public class PCommon  IPCommon               private readonly IHttpContextAccessor  context          public PayraCommon IHttpContextAccessor context                         context   context                    public int GetUserId                         return Convert ToInt16  context HttpContext User FindFirstValue ClaimTypes NameIdentifier                      public string GetUserName                         return  context HttpContext User Identity Name                       public interface IPCommon               int GetUserId            string GetUserName                          Here the implementation of common class  using Microsoft AspNetCore Authorization  using Microsoft AspNetCore Mvc  using Microsoft AspNetCore Mvc Rendering  using Microsoft Extensions Logging  using Pay DataManager Concreate  using Pay DataManager Helper  using Pay DataManager Models  using Pay Web Helper  using Pay Web Models GeneralViewModels  using System  using System Collections Generic  using System Linq  using System Threading Tasks   namespace Pay Controllers         Authorize      public class BankController   Controller                private readonly IUnitOfWork  unitOfWork          private readonly ILogger  logger          private readonly IPCommon  iPCommon            public BankController IUnitOfWork unitOfWork  IPCommon IPCommon  ILogger logger   null                         unitOfWork   unitOfWork               iPCommon   IPCommon              if  logger    null     logger   logger                        public ActionResult Create                         BankViewModel  bank   new BankViewModel                CountryLoad  bank               return View                        HttpPost  ActionName  Create             ValidateAntiForgeryToken          public async Task lt IActionResult gt  Insert BankViewModel bankVM                         if   ModelState IsValid                                CountryLoad bankVM                     TempData  show-message     Notification Show CommonMessage RequiredFieldError  bank     Warning   type  ToastType Warning                   return View bankVM                               try                               bankVM EntryBy    iPCommon GetUserId                    var userName    iPCommon GetUserName                         unitOfWork BankRepo Add ModelAdapter ModelMap new Bank    bankVM                       unitOfWork Save                      TempData  show-message     Notification Show CommonMessage SaveMessage     Success   type  ToastType Success                             catch  Exception ex                                  TempData  show-message     Notification Show CommonMessage SaveErrorMessage  bank     Error   type  ToastType Error                             return RedirectToAction nameof Index                           get userId and name in insert action   iPCommon GetUserId      Thanks  Maksud

User · Answer

I included using System Security Claims and I could access the GetUserId   extension method  NB  I had the using Microsoft AspNet Identity already but couldn t get the extension method  So I guess both of them have to be used in conjunction with one another  using Microsoft AspNet Identity  using System Security Claims    EDIT  This answer is now outdated  Look at Soren s or Adrien s answer for a dated way of achieving this in CORE 1 0

User · Answer

As stated somewhere in this post  the GetUserId   method has been moved to the UserManager   private readonly UserManager lt ApplicationUser gt   userManager   public YourController UserManager lt ApplicationUser gt  userManager         userManager   userManager     public IActionResult MyAction         var userId    userManager GetUserId HttpContext User        var model   GetSomeModelByUserId userId        return View model       If you started an empty project you might need to add the UserManger to your services in startup cs  Otherwise this should already be the case

User · Answer

Until ASP NET Core 1 0 RC1    It s User GetUserId   from System Security Claims namespace   Since ASP NET Core 1 0 RC2    You now have to use UserManager  You can create a method to get the current user    private Task lt ApplicationUser gt  GetCurrentUserAsync     gt   userManager GetUserAsync HttpContext User     And get user information with the object    var user   await GetCurrentUserAsync     var userId   user  Id  string mail   user  Email    Note   You can do it without using a method writing single lines like this string mail    await  userManager GetUserAsync HttpContext User    Email  but it doesn t respect the single responsibility principle  It s better to isolate the way you get the user because if someday you decide to change your user management system  like use another solution than Identity  it will get painful since you have to review your entire code

User · Answer

For ASP NET Core 2 0  Entity Framework Core 2 0  AspNetCore Identity 2 0 api  https   github com kkagill ContosoUniversity-Backend    The Id was changed to User Identity Name       Authorize  HttpGet  Profile        public async Task lt IActionResult gt  GetProfile                 var user   await  userManager FindByIdAsync User Identity Name            return Json new                       IsAuthenticated   User Identity IsAuthenticated              Id   User Identity Name              Name      user FirstName   user LastName                Type   User Identity AuthenticationType                      Response

User · Answer

you can get it in your controller   using System Security Claims  var userId   this User FindFirstValue ClaimTypes NameIdentifier     or write an extension method like before  Core v1 0  using System  using System Security Claims   namespace Shared Web MvcExtensions       public static class ClaimsPrincipalExtensions               public static string GetUserId this ClaimsPrincipal principal                        if  principal    null                  throw new ArgumentNullException nameof principal                 return principal FindFirst ClaimTypes NameIdentifier   Value                      and get wherever user ClaimsPrincipal is available       using Microsoft AspNetCore Mvc  using Shared Web MvcExtensions   namespace Web Site Controllers       public class HomeController   Controller               public IActionResult Index                         return Content this User GetUserId

User · Answer

If you want this in ASP NET MVC Controller  use  using Microsoft AspNet Identity   User Identity GetUserId      You need to add using statement because GetUserId   won t be there without it

User · Answer

Make sure that you have enable windows authentication  If you have anonymous authentication enabled you may be getting a null string  https   docs microsoft com en-us aspnet core security authentication windowsauth view aspnetcore-3 1 amp tabs visual-studio

User · Answer

For getting current user id in razor views  we can inject UserManager in the view like this    inject Microsoft AspNetCore Identity UserManager lt ApplicationUser gt   userManager    string userId    userManager GetUserId User       I hope you find it useful

User · Answer

you have to import Microsoft AspNetCore Identity  amp  System Security Claims     to get current user ID var userId   User FindFirstValue ClaimTypes NameIdentifier       to get current user info var user   await  userManager FindByIdAsync userId

User · Answer

Although Adrien s answer is correct  you can do this all in single line  No need for extra function or mess   It works I checked it in ASP NET Core 1 0  var user   await  userManager GetUserAsync HttpContext User     then you can get other properties of the variable like user Email  I hope this helps someone

User · Answer

Update in ASP NET Core Version  gt   2 0 In the Controller  public class YourControllerNameController   Controller       private readonly UserManager lt ApplicationUser gt   userManager           public YourControllerNameController UserManager lt ApplicationUser gt  userManager                 userManager   userManager             public async Task lt IActionResult gt  YourMethodName                 var userId    User FindFirstValue ClaimTypes NameIdentifier     will give the user s userId         var userName    User FindFirstValue ClaimTypes Name     will give the user s userName                     For ASP NET Core  lt   3 1         ApplicationUser applicationUser   await  userManager GetUserAsync User           string userEmail   applicationUser  Email     will give the user s Email            For ASP NET Core  gt   5 0        var userEmail    User FindFirstValue ClaimTypes Email     will give the user s Email          In some other class  public class OtherClass       private readonly IHttpContextAccessor  httpContextAccessor      public OtherClass IHttpContextAccessor httpContextAccessor                httpContextAccessor   httpContextAccessor            public void YourMethodName              var userId    httpContextAccessor HttpContext User FindFirstValue ClaimTypes NameIdentifier           Then you should register IHttpContextAccessor in the Startup class as follows  public void ConfigureServices IServiceCollection services        services TryAddSingleton lt IHttpContextAccessor  HttpContextAccessor gt             Or you can also register as follows      services AddHttpContextAccessor       For more readability write extension methods as follows  public static class ClaimsPrincipalExtensions       public static T GetLoggedInUserId lt T gt  this ClaimsPrincipal principal                if  principal    null              throw new ArgumentNullException nameof principal             var loggedInUserId   principal FindFirstValue ClaimTypes NameIdentifier            if  typeof T     typeof string                         return  T Convert ChangeType loggedInUserId  typeof T                      else if  typeof T     typeof int     typeof T     typeof long                         return loggedInUserId    null    T Convert ChangeType loggedInUserId  typeof T      T Convert ChangeType 0  typeof T                      else                       throw new Exception  quot Invalid type provided quot                         public static string GetLoggedInUserName this ClaimsPrincipal principal                if  principal    null              throw new ArgumentNullException nameof principal             return principal FindFirstValue ClaimTypes Name              public static string GetLoggedInUserEmail this ClaimsPrincipal principal                if  principal    null              throw new ArgumentNullException nameof principal             return principal FindFirstValue ClaimTypes Email            Then use as follows  public class YourControllerNameController   Controller       public IActionResult YourMethodName                 var userId   User GetLoggedInUserId lt string gt        Specify the type of your UserId          var userName   User GetLoggedInUserName            var userEmail   User GetLoggedInUserEmail             public class OtherClass        private readonly IHttpContextAccessor  httpContextAccessor       public OtherClass IHttpContextAccessor httpContextAccessor                   httpContextAccessor   httpContextAccessor               public void YourMethodName                   var userId    httpContextAccessor HttpContext User GetLoggedInUserId lt string gt        Specify the type of your UserId

[asp.net] How to get the current logged in user Id in ASP.NET Core

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