Program.cs

using GraphQLDemoAPI.Data;
using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.DependencyInjection;

namespace GraphQLDemoAPI
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var webHost = CreateWebHostBuilder(args).Build();

            SeedInitialData(webHost);

            webHost.Run();
        }

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

        private static void SeedInitialData(IWebHost webHost)
        {
            using (var scope = webHost.Services.CreateScope())
            {
                var context = scope.ServiceProvider.GetRequiredService<ApplicationDbContext>();
                new InitialData(context).Seed();
            }
        }
    }
}