using System;

using System.Text.Json;

​

namespace ConsoleApp

{

    public interface INotification

    {

        Severity Severity { get; set; }

        string Message { get; set; }

​

        public string SeverityName => Severity.ToString().ToLower();

    }

​

    public enum Severity

    {

        Info,

        Warning,

        Error,

    }

​

    public class Notification : INotification

    {

        public Severity Severity { get; set; }

        public string Message { get; set; }

    }

​

    class Program

    {

        static void Main(string[] args)

        {

            var notification = new Notification

            {

                Message = "Message",

                Severity = Severity.Info

            };

​

            var jsonText = JsonSerializer.Serialize(notification);

            Console.WriteLine(jsonText);

        }

    }

}

​