using UserManager/IdentityFramework with an Int32 as TKey for IUser

This article is about how to use Int32 as a key for users in asp.net identity.

First the model. As I seed it, you can also see how to instanciate the UserManage.

For this thank you to SymbolSource and to Microsoft of course!

namespace cclw4c.Models
{
    // You can add profile data for the user by adding more properties to your ApplicationUser class, please visit http://go.microsoft.com/fwlink/?LinkID=317594 to learn more.
    public class ApplicationUser : IdentityUser <Int32, CustomUserLogin, CustomUserRole, CustomUserClaim&gt: {
    }

    public class CustomRole : IdentityRole<Int32, CustomUserRole> {
        public CustomRole() { }
        public CustomRole(String name) { Name = name; }
    }

    public class CustomUserRole : IdentityUserRole<Int32> { }
    public class CustomUserClaim : IdentityUserClaim<Int32> { }
    public class CustomUserLogin : IdentityUserLogin<Int32> { }

    public class ApplicationUserDbContext : IdentityDbContext<ApplicationUser, CustomRole, Int32, CustomUserLogin, CustomUserRole, CustomUserClaim>
    {
        public ApplicationUserDbContext()
            : base("ApplicationUser")
        {
            Database.SetInitializer<ApplicationUserDbContext>(new CreateDatabaseIfNotExistsWithSeedData());
        }

        
    }

    public class CreateDatabaseIfNotExistsWithSeedData : CreateDatabaseIfNotExists<ApplicationUserDbContext> {
        protected override void Seed(ApplicationUserDbContext context) {
            base.Seed(context);

            var user = new ApplicationUser() { UserName = "root" };
            UserManager<ApplicationUser, Int32> am = 
                new UserManager<ApplicationUser, Int32>(new UserStore<ApplicationUser, CustomRole, Int32, CustomUserLogin, CustomUserRole, CustomUserClaim>(context));
            IdentityResult ir = am.Create(user, "******");
            if (ir.Succeeded) {
                RoleManager<CustomRole, Int32> rm = new RoleManager<CustomRole, Int32>(new RoleStore<CustomRole, Int32, CustomUserRole>(context));
                rm.Create(new CustomRole("Root"));
                am.AddToRole(user.Id, "Root");
            }
        }
    }
}   

Second use

Int32.Parse(User.Identity.GetUserId()

every where it is needed.
Hightlight on UserManager instanciation

new UserManager<ApplicationUser, Int32>(new UserStore<
    ApplicationUser, 
    CustomRole, 
    Int32, 
    CustomUserLogin, 
    CustomUserRole, 
    CustomUserClaim
>(context));