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• How to extend ASP.NET Core Identity user

How to extend ASP.NET Core Identity user

ASP.NET Core Identity has a default implementation that you can easily extend to fit your needs, like adding a first name and a last name to the users (we will not create new tables here).

• 1 First step to do that: implement the Identity user, and add the properties you need.
  You also have to create the columns in your database, with the same names as the properties.

  
  // Add profile data for application users by adding properties to the ApplicationUser class
  
  public class ApplicationUser : IdentityUser
  {
      public string FirstName { get; set; }
  	
      public string LastName { get; set; }
  }
  

• 2 SignInManager is a class responsible for signing users into your application. Internally, this class uses an IUserClaimsPrincipalFactory<TUser> to generate a ClaimsPrincipal from your user. To add claims to this factory (by default, IUserClaimsPrincipalFactory manages only two claims: the username and the user's identifier), you have to create your own implementation of IUserClaimsPrincipalFactory by inheriting from the default one:

  
  public class AppClaimsPrincipalFactory : UserClaimsPrincipalFactory<ApplicationUser, IdentityRole>
  {
      public AppClaimsPrincipalFactory(
          UserManager<ApplicationUser> userManager
          , RoleManager<IdentityRole> roleManager
          , IOptions<IdentityOptions> optionsAccessor)
  	: base(userManager, roleManager, optionsAccessor)
      { }
  
      public async override Task<ClaimsPrincipal> CreateAsync(ApplicationUser user)
      {
          var principal = await base.CreateAsync(user);
  
          if (!string.IsNullOrWhiteSpace(user.FirstName))
          {
              ((ClaimsIdentity)principal.Identity).AddClaims(new[] {
          new Claim(ClaimTypes.GivenName, user.FirstName)
      });
          }
  
          if (!string.IsNullOrWhiteSpace(user.LastName))
          {
              ((ClaimsIdentity)principal.Identity).AddClaims(new[] {
           new Claim(ClaimTypes.Surname, user.LastName),
      });
          }
  
          return principal;
      }
  }
  

• 3 Finally, you have to register the custom factory you just created in your application startup class, after adding the Identity service.

  
  public void ConfigureServices(IServiceCollection services)
  {
  	// [...]
  
  	services.AddDbContext<SecurityDbContext>(options => options.UseSqlServer(Configuration.GetConnectionString("Security")));
  
  	services.AddIdentity<ApplicationUser, IdentityRole>()
  		.AddEntityFrameworkStores<SecurityDbContext>()
  		.AddDefaultTokenProviders();
  		
  	services.AddScoped<Microsoft.AspNetCore.Identity.IUserClaimsPrincipalFactory<ApplicationUser>, AppClaimsPrincipalFactory>();
  
  	// [...]
  }