Vanilla AspNetCore

VanillaGenericHostApplication.cs

using System.IO;

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

namespace Vanilla
{
    public class Program
    {
        static void Main(string[] args) =>
            CreateHostBuilder(args).RunConsoleAsync();

        static IHostBuilder CreateHostBuilder(string[] args) =>
            // THIS IS THE SAME AS CALLING Host.CreateDefaultBuilder().ConfigureAppConfig(config => config.AddJsonFile("config.json"));
            new HostBuilder()
                .ConfigureLogging(logging => {
                    logging.AddConsole();
                })
                .ConfigureServices(ConfigureServices)
                .ConfigureAppConfiguration(config => {
                    config.AddJsonFile("config.json", optional: true);
                    config.AddEnvironmentVariables();
                })
                .ConfigureHostConfiguration(config => {
                    config.AddEnvironmentVariables(prefix: "DOTNET_");
                    config.AddCommandLine(args);
                })
                .UseContentRoot(Directory.GetCurrentDirectory());
                // .UseDefaultServiceProvider(config => {
                    // THIS ONLY SETS ENV BASED CONFIG TO THE ALREADY PROVIDED SvcPrvdr
                // });
    }
}

VanillaGenericWebHostApplication.cs

using System.IO;

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;

using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;

namespace Vanilla
{
    public class Program
    {
        static void Main(string[] args) =>
            CreateHostBuilder(args).RunConsoleAsync();

        static IHostBuilder CreateHostBuilder(string[] args) =>
            // THIS IS THE SAME AS CALLING Host.CreateDefaultBuilder().ConfigureAppConfig(config => config.AddJsonFile("config.json"));
            new HostBuilder()
                .ConfigureLogging(logging => {
                    logging.AddConsole();
                })
                .ConfigureAppConfiguration(config => {
                    config.AddJsonFile("config.json", optional: true);
                    config.AddEnvironmentVariables();
                })
                .ConfigureHostConfiguration(config => {
                    config.AddEnvironmentVariables(prefix: "DOTNET_");
                    config.AddCommandLine(args);
                })
                .UseContentRoot(Directory.GetCurrentDirectory())
                // .UseDefaultServiceProvider(config => {
                    // THIS ONLY SETS ENV BASED CONFIG TO THE ALREADY PROVIDED SvcPrvdr
                // });
                // This Wraps HostBuilder into GenericWebHostBuilder and
                // adds GenericWebHostService as a HostedService to the HostBuilder
                .ConfigureWebHost(webhost => {
                    webhost
                        .UseKestrel()
                        .Either(Configure(appBuilder => { })).Or(UseStartUp<StartUpClass>());
                });
    }
}