Adding custom claim not working in asp.net core identity

Question

I have created CustomClaimType to store user id:

public static class CustomClaimTypes
{
    public const string UserId = "UserId";
}

When user login, I set it:

var claims = new List<Claim>();
claims.Add(new Claim(ClaimTypes.Name, doc_session.ufname + " " + doc_session.ulname));
claims.Add(new Claim(CustomClaimTypes.UserId, doc_session.isci_id.Value.ToString()));
ClaimsIdentity userIdentity = new ClaimsIdentity(claims,"Identity.Application");
ClaimsPrincipal principal = new ClaimsPrincipal(userIdentity);

I have also created custom identity extension:

public static class IdentityExtensions
{
    public static int GetUserId(this IIdentity identity)
    {
        ClaimsIdentity claimsIdentity = identity as ClaimsIdentity;
        Claim claim = claimsIdentity?.FindFirst(CustomClaimTypes.UserId);

        if (claim == null)
            return 0;

        return int.Parse(claim.Value);
    }

    public static string GetName(this IIdentity identity)
    {
        ClaimsIdentity claimsIdentity = identity as ClaimsIdentity;
        Claim claim = claimsIdentity?.FindFirst(ClaimTypes.Name);

        return claim?.Value ?? string.Empty;
    }
}

But when I call User.Identity.GetUserId(); I get 0 (null) as result.

Edward · Accepted Answer · 2019-02-05 12:30:38Z

For adding extra claims to Identity, you could implement custom CustomClaimsPrincipalFactory.

CustomClaimsPrincipalFactory

public class CustomClaimsPrincipalFactory : UserClaimsPrincipalFactory<IdentityUser<int>>
{
    public CustomClaimsPrincipalFactory(UserManager<IdentityUser<int>> userManager,
                                            IOptions<IdentityOptions> optionsAccessor)
    : base(userManager, optionsAccessor)
    {
    }

    public async override Task<ClaimsPrincipal> CreateAsync(IdentityUser<int> user)
    {
        var principal = await base.CreateAsync(user);

        // Add your claims here
        ((ClaimsIdentity)principal.Identity).AddClaims(
            new[] { new Claim(ClaimTypes.Name, user.UserName),
            new Claim(CustomClaimTypes.UserId, user.Id.ToString())
            });

        return principal;
    }
}

Register CustomClaimsPrincipalFactory

public void ConfigureServices(IServiceCollection services)
{
    services.Configure<CookiePolicyOptions>(options =>
    {
        // This lambda determines whether user consent for non-essential cookies is needed for a given request.
        options.CheckConsentNeeded = context => true;
        options.MinimumSameSitePolicy = SameSiteMode.None;
    });

    services.AddDbContext<ApplicationDbContext>(options =>
        options.UseSqlServer(
            Configuration.GetConnectionString("DefaultConnection")));
    services.AddDefaultIdentity<IdentityUser<int>>()
        .AddEntityFrameworkStores<ApplicationDbContext>();
    services.AddScoped<IUserClaimsPrincipalFactory<IdentityUser<int>>, CustomClaimsPrincipalFactory>();
    services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
}

IdentityExtensions

public static class IdentityExtensions
{
    public static int GetUserId(this ClaimsPrincipal identity)
    {
        Claim claim = identity?.FindFirst(CustomClaimTypes.UserId);

        if (claim == null)
            return 0;

        return int.Parse(claim.Value);
    }

    public static string GetName(this ClaimsPrincipal identity)
    {
        Claim claim = identity?.FindFirst(ClaimTypes.Name);

        return claim?.Value ?? string.Empty;
    }
}

Useage

public IActionResult About()
{
    var claims = User.Claims;
    var userId = User.GetUserId();
    var userName = User.GetName();
    ViewData["Message"] = "Your application description page.";

    return View();
}

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