ConfigurationBinder.Get <T> usage example

Startup.cs

// Startup.cs
public class Startup
{
    public void ConfigureServices(IServiceCollection services)
    {
        // Some code...

        MailFeature mailFeature = Configuration.GetSection("MailFeature").Get<MailFeature>();
        services.AddSingleton(mailFeature);

        // Some other code....
    }
}

// Inject dependency in controller.
public class HomeController : Controller
{
    private readonly ILogger<HomeController> _logger;
    private readonly MailFeature mailFeature;

    // the Options class is directly injected
    public HomeController(ILogger<HomeController> logger, MailFeature mailFeature)
    {
        _logger = logger;
        this.mailFeature = mailFeature;
    }
}