using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.Serialization.Formatters;

using System.IO;

using System.Data;

using System.ComponentModel.DataAnnotations;

using System.Globalization;

using System.Reflection;

using System.Collections.ObjectModel;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;    

​

using NUnit.Framework; // Throws NUnit.Framework.AssertionException

​

//https://stackoverflow.com/questions/60711807/how-to-deserialize-encapsulated-table-of-objects-in-net-core-from-json-file

​

    public class LeagueEntity

    {

        public int league_id { get; set; }

        public string league_name { get; set; }

    }

​

    class TestClass

    {

        public static void Test()

        {

            var jsonString  = GetJson();

            var leagues = JsonConvert.DeserializeAnonymousType(jsonString, 

                                                               new { api = new { leagues = default(List<LeagueEntity>) } })

                ?.api?.leagues;

​

            var newJson = JsonConvert.SerializeObject(leagues, Formatting.Indented);

            Console.WriteLine("Re-serialized {0}:", leagues);

            Console.WriteLine(newJson);

            Assert.IsTrue(JToken.DeepEquals(JToken.Parse(jsonString).SelectToken("api.leagues"), JToken.Parse(newJson)));

        }   

        static string GetJson()

        {

            var json = @"{

    ""api"": {

        ""results"": 1496,

        ""leagues"": [{

            ""league_id"": 1,

            ""league_name"": ""my name""

        }]

    }

}

";

            return json;

        }

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: {0} ({1})", System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription , GetNetCoreVersion());

            Console.WriteLine("{0} version: {1}", typeof(JsonSerializer).Assembly.GetName().Name,  typeof(JsonSerializer).Assembly.FullName);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

                Console.WriteLine("Failed with unhandled exception: ");

                Console.WriteLine(ex);

                throw;

            }

        }

        public static string GetNetCoreVersion()

        {

            //https://techblog.dorogin.com/how-to-detect-net-core-version-in-runtime-ecd65ad695be

            //

            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];

            return null;

        }

    }

​