using System;

using System.Text.Json;

using System.Text.Json.Serialization;

public class Program

{

    public static void Main()

    {   

        Person student = new Student {

            Name = "Nechemia",

            Major = "CS"

        };

        var json = JsonSerializer.Serialize(student, new JsonSerializerOptions { WriteIndented = true });

        Console.WriteLine(json);

        var copyStudent = JsonSerializer.Deserialize<Person>(json);

    }

}

​

[JsonDerivedType(typeof(Student), (int) PersonType.Student)]

[JsonDerivedType(typeof(Gaurd), (int) PersonType.Gaurd)]

abstract class Person // Prompt

{

    public string Name {get; set;}

}

​

class Student : Person // SelectPrompt

{

    public string Major {get; set;}

}

​

class Gaurd : Person // SelectPrompt

{

    public int DailyDoughnutCount {get; set;}

}

​

enum PersonType {

    Student,

    Gaurd

}

​