Sample Code for Get appSetting config value in .Net Core application

 I have created Sample class to the Key Values from application (appSettings.json). for that i have initialise the Configuration instance at Constructor level. Later on consumed same instance to get the Key Value.

Sample Code is Below

Calling from application

string Conn = ConfigurationExtension.GetConfigKeyValue("ConnectionStrings:DBConnection").ToString();

Base Code 

    public class ConfigurationExtension

    {

        IConfiguration configuration;

        public ConfigurationExtension()

        {

            var builder = new ConfigurationBuilder()

                .AddJsonFile("appSettings.json");

            configuration = builder.Build();

        }

        /// <summary>

        /// Get appSettings json key value ex Key: "ConnectionStrings:DBConnection"

        /// </summary>

        /// <param name="Key"></param>

        /// <returns></returns>

        public static string GetConfigKeyValue(string Key) {

            ConfigurationExtension obj = new ConfigurationExtension();            

            string con = obj.configuration[Key].ToString();

            return con;

        }

    }