UseHostingForConsole.cs

    /*
    * Use an approach similar to ASP.NET core for generic host in a console application
    */
    
    public interface IStartup
    {
        void ConfigureServices(
            HostBuilderContext hostBuilderContext, 
            IServiceCollection serviceCollection);

        void SetupAppConfiguration(
            HostBuilderContext hostBuilderContext, 
            IConfigurationBuilder configurationBuilder,
            string[] commandLineArgs);
    }
    
    public class Startup : IStartup
    {
        public void ConfigureServices(HostBuilderContext hostBuilderContext, IServiceCollection serviceCollection)
        {
        }
        
        public void SetupAppConfiguration(HostBuilderContext hostBuilderContext, IConfigurationBuilder configurationBuilder,
            string[] commandLineArgs)
        {
        }
    }
    
    public static class ConsoleHostBuilderExtensions
    {
        public static IHostBuilder UseStartup<TStartup>(this IHostBuilder hostBuilder, TStartup startup, string[] commandLineArgs)
            where TStartup : IStartup
        {
            hostBuilder.ConfigureAppConfiguration((hostBuilderContext, configurationBuilder) =>
                startup.SetupAppConfiguration(hostBuilderContext, configurationBuilder, commandLineArgs));

            hostBuilder.ConfigureServices(startup.ConfigureServices);
            
            return hostBuilder;
        }
    }