Host.CreateDefaultBuilder.Example

This is an example of how you can use the new generic Host's CreateDefaultBuilder() method with a Startup.cs pattern.

Using the extension methods from Extensions namespace of this project, you can initialize a new generic IHost as so:

using CreateDefaultHostBuilderExample.Extensions;
using Microsoft.Extensions.Hosting;
using System.Threading.Tasks;

class Program
{
	static async Task Main(string[] args)
	{
		var host = CreateHostBuilder(args).Build();
		await host.RunAsync();
	}

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

Your Startup.cs file must follow this specification:

1. Implement an optional public constructor with an IConfiguration parameter.
2. Should implement a public method with this signature: void ConfigureServices(IServiceCollection).

For example:

public class Startup
{
	public IConfiguration Configuration { get; }

	public Startup(IConfiguration configuration)
	{
		Configuration = configuration;
	}

	public void ConfigureServices(IServiceCollection services)
	{
		// Inject a configuration:
		services.Configure<MySettingsModel>(
			Configuration.GetSection("SettingsSection"));

		// Inject your services, too. For example:
		// services.AddHostedService<MyBackgroundService>();
		// services.AddTransient<IMyService, MyService>();
	}
}