Actually read AppSettings in ConfigureServices phase in ASP.NET Core

Question

I need to setup a few dependencies (services) in the ConfigureServices method in an ASP.NET Core 1.0 web application.

The issue is that based on the new

Answer 1

Starting from ASP.NET Core 2.0 we do configuration setup in Program class when building WebHost instance. Example of such setup:

return new WebHostBuilder()
    .UseKestrel()
    .UseContentRoot(Directory.GetCurrentDirectory())
    .ConfigureAppConfiguration((builderContext, config) =>
    {
        IHostingEnvironment env = builderContext.HostingEnvironment;

        config.AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
            .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true, reloadOnChange: true);
    })

Among others, this allows using configuration directly in Startup class, getting an instance of IConfiguration via constructor injection (thank you, built-in DI container):

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

    public IConfiguration Configuration { get; }

    ...
}