Using Autofac in .NET 6 Minimal API’s

Before .NET 6 Minimal API’s you had 2 places where you had to apply some changes to replace the built-in IoC container with Autofac.

First in your Program.cs file:

	public static class Program
	{
	public static void Main(string[] args)
	=> CreateHostBuilder(args).Build().Run();
	public static IHostBuilder CreateHostBuilder(string[] args) =>
	Host.CreateDefaultBuilder(args)
	.UseServiceProviderFactory(new AutofacServiceProviderFactory())
	.ConfigureWebHostDefaults(webBuilder =>
	{
	webBuilder.UseStartup<Startup>();
	});
	}

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And second in your Startup.cs file:

	public class Startup
	{
	public void ConfigureContainer(ContainerBuilder containerBuilder)
	{
	// Add your Autofac DI registrations here
	}
	}

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But what should you do when using .NET 6 Minimal API’s? In that case your Startup.cs file is gone.

You still need to apply the same 2 steps but this time directly on the Host property of the WebApplicationBuilder:

	var builder = WebApplication.CreateBuilder(args);
	builder.Host.UseServiceProviderFactory(new AutofacServiceProviderFactory());
	builder.Host.ConfigureContainer<ContainerBuilder>(builder =>
	{
	// Add your Autofac DI registrations here
	});

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Remark: I assume that the process is quite similar for other 3th party IoC containers.