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 Node Next { get; set; }
public static void Test()
Assert.IsTrue(node.Next != node && node.Next.Next == node);
var options = new JsonSerializerOptions
ReferenceHandler = ReferenceHandler.Preserve,
var json = JsonSerializer.Serialize(node, options);
var node2 = JsonSerializer.Deserialize<Node>(json, options);
Assert.IsTrue(node2.Next != node2 && node2.Next.Next == node2);
var json2 = JsonSerializer.Serialize(node2, options);
Assert.IsTrue(json == 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.Location.Split(new[] { '/', '\\' }, StringSplitOptions.RemoveEmptyEntries);
int netCoreAppIndex = Array.IndexOf(assemblyPath, "Microsoft.NETCore.App");
if (netCoreAppIndex > 0 && netCoreAppIndex < assemblyPath.Length - 2)
return assemblyPath[netCoreAppIndex + 1];