Example of a controller taking IOptionsSnapshot<T> as a parameter to the constructor

HomeController.cs

    public class HomeController : Controller
    {
        private readonly MyAppSettings _settings;

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

        public IActionResult Error()
        {
            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
        }
    }