configureappio

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

        public int CountOfItems { get; set; } 
    }

configureappio

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

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);
        }