Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
using TrendyShop.Data;
using TrendyShop.Models;

namespace TrendyShop
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var host = CreateHostBuilder(args).Build();
            var scope = host.Services.CreateScope();
            var services = scope.ServiceProvider;
            try
            {
                var context = services.GetRequiredService<EFDbContext>();
                context.Database.Migrate();
                
                var roleManager = services.GetRequiredService<RoleManager<IdentityRole>>();
                var userManager = services.GetRequiredService<UserManager<User>>();

                DbInitializer.Initialize(context,roleManager,userManager).Wait();
            }
            catch (Exception ex)
            {
                var logger = services.GetRequiredService<ILogger<Program>>();
                logger.LogError(ex, "An error occurred seeding the DB.");
            }

            host.Run();
        }

        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                {
                    webBuilder.UseStartup<Startup>();
                });
    }
}