How To Read Values From App.settings File In Web API

How to read values from App.settings file via IOptions in Web API.

How to read values from appsettings.json via IOptions Interface in Web API?

Define your properties in the key-value format in the Json file. I defined  MicroservicesOptions in the Json file.

{
  "Logging": {
    "LogLevel": {
      "Default": "Information"
    }
  }
  "MicroservicesOptions": {
    "Application1": "App1",
    "Application2": "App2",
    "Application3": "App3"
  }
}

Make a class with the same properties, and make sure names should be exactly the same.

  public class MicroservicesOptions
{
    public string? Application1 { get; set; }
    public string? Application2 { get; set; }
    public string? Application3 { get; set; }
}

Inject configurations in Startup.cs.

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddControllers();
            services.Configure<MicroservicesOptions>(Configuration.GetSection("MicroServices"));
        }

Now Inject a class containing properties in the constructor of your desired class where you need.

    public class ValuesController : ControllerBase
    {
        private readonly MicroservicesOptions _microservicesOptions;
        public ValuesController(IOptions<MicroservicesOptions> options)
        {
            _microservicesOptions = options.Value;
        }
    }