configureappio

        public void ConfigureServices(IServiceCollection services)
        {        
            services.AddMvc();
            services.AddOptions();
            services.Configure<MyAppSettings>(Configuration.GetSection("MyAppSettings"));

            // use a lambda to act as the bridge between requesting an instance of MyAppSettings but 
            // getting it from IOptionsSnapshot<MyAppSettings>
            services.AddTransient<MyAppSettings>((opt) => opt.GetService<IOptionsSnapshot<MyAppSettings>>().Value);
        }

configureappio

{
  "Logging": {
    "IncludeScopes": false,
    "LogLevel": {
      "Default": "Warning"
    }
  },
  "MyAppSettings": {
    "ApplicationName": "Hello World",
    "CountOfItems": 10

configureappio

    public class MyAppSettings
    {
        public string ApplicationName { get; set; }

        public int CountOfItems { get; set; } 
    }

configureappio

    public class HomeController : Controller
    {
        private readonly MyAppSettings _settings;

        public HomeController(MyAppSettings settings)
        {
            _settings = settings ?? throw new ArgumentNullException(nameof(settings));
        }
        public IActionResult Index()
        {

configureappio

    public class HomeController : Controller
    {
        private readonly MyAppSettings _settings;

        public HomeController(IOptionsSnapshot<MyAppSettings> settings)
        {
            _settings = settings?.Value ?? throw new ArgumentNullException(nameof(settings));
        }
        public IActionResult Index()
        {

configureappio

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

        public IConfiguration Configuration { get; private set; }

        // This method gets called by the runtime. Use this method to add services to the container.

configureappio

        public void ConfigureServices(IServiceCollection services)
        {        
            services.AddMvc();
            services.AddOptions();
            services.Configure<MyAppSettings>(Configuration.GetSection("MyAppSettings"));
        }

configureappio

    public interface IMyAppSettings
    {
        string ApplicationName { get; }

        int CountOfItems { get; }
    }

configureappio

    public class MyAppSettingsReader : IMyAppSettings
    {
        public string ApplicationName { get;  set; }

        public int CountOfItems { get; set; }        
    }

    public class MyAppSettingsBridge : IMyAppSettings
    {
        private readonly IOptionsSnapshot<MyAppSettingsReader> _optionsConfig;

configureappio

    public class Startup
    {
       // Other methods omitted for brevity in example
        
       public void ConfigureServices(IServiceCollection services)
        {        
            services.AddMvc();
            services.AddOptions();
            // use the reader class to map the configuration
            services.Configure<MyAppSettingsReader>(Configuration.GetSection("MyAppSettings"));