Example of binding POCO values from IConfiguration instance

config.json

{
    "demoApp": {
        "contactPageTagline": "Hello contact page"
    }
}

DemoAppOptions.cs

// Here's the app-settings POCO
namespace DemoWebApp
{
    public class DemoAppOptions
    {
        public string BaseAddress { get; set; }
        public string ContactPageTagline { get; set; }
    }
}

HomeController.cs

// this controller is using an app-settings POCO
using Microsoft.Framework.OptionsModel;

namespace DemoWebApp.Controllers
{
    public class HomeController : Controller
    {
        private readonly DemoAppOptions _demoAppOptions;

        public HomeController(
            IOptions<DemoAppOptions> demoAppOptions)
        {
            _demoAppOptions = demoAppOptions.Options;
        }

        public IActionResult Contact()
        {
            ViewBag.Message = _demoAppOptions.ContactPageTagline;

            return View();
        }

    }
}

Startup.cs

// The Startup class adds a line to ConfigureServices to apply IConfiguration onto DemoAppOptions

namespace DemoWebApp
{
    public class Startup
    {
        public Startup(IHostingEnvironment env)
        {
            // Setup configuration sources.
            Configuration = new Configuration()
                .AddJsonFile("config.json")
                .AddEnvironmentVariables();
        }

        public IConfiguration Configuration { get; set; }

        // This method gets called by the runtime.
        public void ConfigureServices(IServiceCollection services)
        {
// ---- This is the line which is added
            services.Configure<DemoAppOptions>(Configuration.GetSubKey("demoApp"));