asp.net core seed data with startup

Question

I am trying to seed data at startup in preparation for publishing. I want to have the web admin seeded at startup. What I did is

 

a class

 

using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
using RoSafety.Data;
using RoSafety.Models;
using System.Linq;

namespace RoSafety
{
    public class RoSafetyDbStartup
    {
        private readonly ApplicationDbContext _context;

        public RoSafetyDbStartup(ApplicationDbContext context)
        {
            _context = context;
        }

        public async void SeedAdminUser()
        {
            var user = new UserDataClass
            {
                UserName = "[e-mail]",
                NormalizedUserName = "[e-mail]",
                Email = "[e-mail]",
                OrgID = "RS-001",
                NormalizedEmail = "[e-mail]",
                EmailConfirmed = true,
                LockoutEnabled = true
            };
            var roleStore = new RoleStore<UserRoleClass>(_context);

            if(!_context.Roles.Any(r => r.Name == "AdminNew"))
            {
                await roleStore.CreateAsync(new UserRoleClass { Name = "AdminNew", NormalizedName = "ADMINNEW" });
            }
            if(!_context.Users.Any(u => u.UserName == user.UserName))
            {
                var password = new PasswordHasher<UserDataClass>();
                var hashed = password.HashPassword(user, "vsdrg4gherrhb4re54#RFw");
                user.PasswordHash = hashed;
                var userStore = new UserStore<UserDataClass>(_context);
                await userStore.CreateAsync(user);
                await userStore.AddToRoleAsync(user, "AdminNew");
            }

            await _context.SaveChangesAsync();

        }
    }
}

and in statup

 

public void Configure(IApplicationBuilder app, IWebHostEnvironment env, RoSafetyDbStartup dbInit)
        {
.................................other data........................

dbInit.SeedAdminUser();

}

but no data is updated in AspNetUsers or AspNetRoles on database-update

 

Oh, and my Identity is

 

public class UserDataClass : IdentityUser
    {
......some data.....
}

public class UserRoleClass : IdentityRole
    {
        public virtual ICollection<AppIdentityRole> AppUserRoles { get; set; }
    }

    public class AppIdentityRole : IdentityUserRole<string>
    {
        public virtual UserDataClass User { get; set; }
        public virtual UserRoleClass Role { get; set; }
    }

What am I doing wrong?