Program.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using ASimmo.Data;
using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;

namespace ASimmo
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var host = CreateWebHostBuilder(args).Build();
            //SeedDatabase(host);
            host.Run();
        }

        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseStartup<Startup>();

        private static void SeedDatabase(IWebHost host)
        {
            var scopeFactory = host.Services.GetRequiredService<IServiceScopeFactory>();

            using (var scope = scopeFactory.CreateScope())
            {
                var context = scope.ServiceProvider.GetRequiredService<ApplicationDbContext>();

                if (context.Database.EnsureCreated())
                {
                    try
                    {
                        SeedData.Initialize(context);
                    }
                    catch (Exception ex)
                    {
                        var logger = scope.ServiceProvider.GetRequiredService<ILogger<Program>>();
                        logger.LogError(ex, "A database seeding error occurred.");
                    }
                }
            }
        }
    }
}