using System.Collections;
using System.Collections.Generic;
using System.Runtime.Serialization.Formatters;
using System.ComponentModel.DataAnnotations;
using System.Globalization;
using System.Collections.ObjectModel;
using System.Text.Json.Serialization;
public abstract class Base
protected abstract IComparable ProtectedSortValue { get; }
public IComparable SortValue => ProtectedSortValue;
public class Derived : Base
public int VoteCount { get; set; }
protected override IComparable ProtectedSortValue => VoteCount;
public static void Test()
var derived = new Derived { VoteCount = 101 };
var json1 = JsonSerializer.Serialize(derived, typeof(Derived));
Console.WriteLine(json1);
var json2 = JsonSerializer.Serialize(derived, typeof(Base));
Console.WriteLine(json2);
public static void Main()
Console.WriteLine("Environment version: {0} ({1})", System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription , GetNetCoreVersion());
Console.WriteLine("System.Text.Json version: " + typeof(JsonSerializer).Assembly.FullName);
Console.WriteLine("Failed with unhandled exception: ");
public static string GetNetCoreVersion()
var assembly = typeof(System.Runtime.GCSettings).GetTypeInfo().Assembly;
var assemblyPath = assembly.CodeBase.Split(new[] { '/', '\\' }, StringSplitOptions.RemoveEmptyEntries);
int netCoreAppIndex = Array.IndexOf(assemblyPath, "Microsoft.NETCore.App");
if (netCoreAppIndex > 0 && netCoreAppIndex < assemblyPath.Length - 2)
return assemblyPath[netCoreAppIndex + 1];