Create and register configuration parameters into service collection asp.net core

supposed you have a json file with a specific parameter and you want to fill a class with the specified properties.

and then register this object to the asp.net core service  collection
here is an example how to do it.

/// Create, bind and register as service the specified configuration parameters
        /// </summary>
        /// <typeparam name="TConfig">Configuration parameters</typeparam>
        /// <param name="services">Collection of service descriptors</param>
        /// <param name="configuration">Set of key/value application configuration properties</param>
        /// <returns>Instance of configuration parameters</returns>
        public static TConfig ConfigureStartupConfig<TConfig>(this IServiceCollection services, IConfiguration configuration) where TConfig : class, new()
        {
            if (services == null)
            {
                throw new ArgumentNullException(nameof(services));
            }

            if (configuration == null)
            {
                throw new ArgumentNullException(nameof(configuration));
            }

            //create instance of config
            TConfig config = new TConfig();

            //bind it to the appropriate section of configuration
            configuration.Bind(config);

            //and register it as a service
            services.AddSingleton(config);

            return config;
        }

this will do it.