aspnetcore/src/Identity/samples/IdentitySample.DefaultUI/Program.cs

using System.IO;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Hosting;

namespace IdentitySample.DefaultUI
{
    public static class Program
    {
        public static void Main(string[] args)
        {
            CreateHostBuilder(args).Build().Run();
        }

        public static bool UseStartup { get; set; } = true;

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