Why asp.net Identity user id is string?

Question

I want to use System.Guid type as an id for all of my tables in asp.net web api application. But I also use Asp.net Identity, which using a string-type id (to store guids as well). So I wonder why is it using string id instead of System.Guid by default? And what is better choice to use through all the application - Guid id or string-guid id? In case of using string - what is the most proper and reliable way to generate new id - in code or in database?

Answer 1

With ASP.NET Core, you have a very simple way to specify the data type you want for Identity's models.

First step, override identity classes from < string> to < data type you want> :

public class ApplicationUser : IdentityUser<Guid>
{
}

public class ApplicationRole : IdentityRole<Guid>
{
}

Declare your database context, using your classes and the data type you want :

public class ApplicationDbContext : IdentityDbContext<ApplicationUser, ApplicationRole, Guid>
    {
        public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
            : base(options)
        {
        }

        protected override void OnModelCreating(ModelBuilder builder)
        {
            base.OnModelCreating(builder);
            // Customize the ASP.NET Identity model and override the defaults if needed.
            // For example, you can rename the ASP.NET Identity table names and more.
            // Add your customizations after calling base.OnModelCreating(builder);
        }
    }

And in your startup class, declare the identity service using your models and declare the data type you want for the primary keys :

services.AddIdentity<ApplicationUser, ApplicationRole>()
            .AddEntityFrameworkStores<ApplicationDbContext, Guid>()
            .AddDefaultTokenProviders();