Read appsettings.{env}.json objects in .NET 6 API – Values coming as NULL

I am using .NET 6 to create APIs.
I have environment-based appsettings.json files.

I have created apt profiles in launchSettings.json as well.

I am trying to use Options pattern to read the key/values inside one of the controllers.

I get the values as NULL every single time.

When I debug the Program.cs file, I am able to see the proper values via the below line of code.

builder.Configuration.GetSection(key: "Config").Get<Config>();

Please help. Code used is as below:

Program.cs:

var builder = WebApplication.CreateBuilder(args);
var configuration = builder.Configuration;

var env = Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT");

configuration
    .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
    .AddJsonFile($"appsettings.{env}.json", true, true);

builder.Configuration.GetSection(key: "Config").Get<Config>();

builder.Services.AddControllers();
builder.Services.AddEndpointsApiExplorer();
builder.Services.AddSwaggerGen();
builder.Services.AddScoped<IProductRepository, ProductRepository>();
builder.Services.AddSingleton<Config>();

Config.cs:

public class Config
    {
        public string Environment { get; set; }
        public string Type { get; set; }
    }

ProductsController.cs

    [Route("api/[controller]")]
    [ApiController]
    public class ProductsController : ControllerBase
    {
        private readonly IProductRepository _repository;
        private readonly Config _config;

        public ProductsController(IProductRepository repository,
            IOptions<Config> config)
        {
            _repository = repository;
            _config = config.Value;
        }

        [HttpGet]
        [Route("/configs")]
        public IActionResult GetConfigs()
        {
            var model = new { type = _config.Type, env = _config.Environment };
            return Ok(model);
        }

appsettings.json:

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "AllowedHosts": "*",
  "Config": {
    "Environment": "local",
    "Type": "local Server"
  }
}

appsettings.Development.json:

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "Config": {
    "Environment": "Development",
    "Type": "Development Server"
  }
}

appsettings.Staging.json:

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft.AspNetCore": "Warning"
    }
  },
  "Config": {
    "Environment": "Staging",
    "Type": "Staging Server"
  }
}

launchSettings.json:

 "profiles": {
    "API - Development": {
      "commandName": "Project",
      "dotnetRunMessages": true,
      "launchBrowser": true,
      "launchUrl": "swagger",
      "applicationUrl": "https://localhost:7082;http://localhost:5082",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "API - Staging": {
      "commandName": "Project",
      "dotnetRunMessages": true,
      "launchBrowser": true,
      "applicationUrl": "https://localhost:5001;http://localhost:5000",
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Staging"
      }
    }
}

Output:

>Solution :

I think you might need to use configuration.GetSection in Services.Configure which means registering Config object from Config section of appsettings.json.

builder.Services.Configure<Config>(configuration.GetSection("Config"));