using System.Threading.Tasks;

using Autofac;

using Autofac.Extensions.DependencyInjection;

using Microsoft.Extensions.DependencyInjection;

using Microsoft.Extensions.Hosting;

namespace GenericHostBuilderExample

{

internal static class Program

{

public static async Task Main(string[] args)

{

// The `UseServiceProviderFactory(new AutofacServiceProviderFactory())` call here allows for

// ConfigureContainer to be supported with

// a strongly-typed ContainerBuilder. If you don't

// have the call to `UseServiceProviderFactory(new AutofacServiceProviderFactory())` here, you won't get

// ConfigureContainer support. This also automatically

// calls Populate to put services you register during

// ConfigureServices into Autofac.

await Host.CreateDefaultBuilder(args)

.UseServiceProviderFactory(new AutofacServiceProviderFactory())

.ConfigureServices(ConfigureServices)

.ConfigureContainer<ContainerBuilder>(ConfigureContainer)

.RunConsoleAsync();

}

private static void ConfigureServices(IServiceCollection services)

// Use extensions from libraries to register services in the

// collection. These will be automatically added to the

// Autofac container.

=> services.AddHostedService<HostedService>();

private static void ConfigureContainer(ContainerBuilder containerBuilder)

{

// Add any Autofac modules or registrations.

// This is called AFTER ConfigureServices so things you

// register here OVERRIDE things registered in ConfigureServices.

//

// You must have the call to `UseServiceProviderFactory(new AutofacServiceProviderFactory())`

// when building the host or this won't be called.

containerBuilder.RegisterType<Logger>().As<ILogger>();

}

}

}