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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 provide your needs, like add 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 than 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 a IUserClaimsPrincipalFactory<TUser> to generate a ClaimsPrincipal from your user. To add claims to this factory (by default, IUserClaimsPrincipalFactory manages only two claims : username and user's identifier), you have to create you own implementation of IUserClaimsPrincipalFactory by inheriting 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 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>();
  
  	// [...]
  }