.net core 中如何读取 appsettings.json 相关配置

{
  "Logging": {
    "LogLevel": {
      "Default": "Debug",
      "System": "Information",
      "Microsoft": "Information"
    },
    "AllowedHosts": "*"
  },
  "ConfigSetting": {
    "Ctu": 1,
    "Btu": "Btu",
    "Atu": "Atu"
  }
}

    public class ConfigSetting
    {
        public int Ctu { get; set; }
        public string Btu { get; set; }
        public string Atu { get; set; }
    }

        public void ConfigureServices(IServiceCollection services)
        {
            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
            services.Configure<ConfigSetting>(Configuration.GetSection("ConfigSetting"));
        }

    [Route("api/[controller]")]
    [ApiController]
    public class ValuesController : ControllerBase
    {
        private readonly IOptions<ConfigSetting> _ConfigSettingt;
        public ValuesController(IOptions<ConfigSetting> ConfigSetting)
        {
            _ConfigSettingt = ConfigSetting;
        }
        [HttpGet("{id}")]
        public ActionResult<string> Get(int id)
        {
            return _ConfigSettingt.Value.Atu;
        }
    }