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/69486089/override-newtonsoft-json-serialization-in-asp-net-core-to-make-the-typenamehandl

​

    public class SuppressCollectionTypeNamesContractResolver : DefaultContractResolver

    {

        internal static TypeNameHandling? RemoveCollectionTypenameHandling(TypeNameHandling? typeNameHandling, Type valueType)

            => typeNameHandling ?? (typeof(IEnumerable).IsAssignableFrom(valueType) && valueType != typeof(string) ? TypeNameHandling.None : typeNameHandling);

​

        protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)

        {

            var property = base.CreateProperty(member, memberSerialization);

            property.TypeNameHandling = RemoveCollectionTypenameHandling(property.TypeNameHandling, property.PropertyType);

            return property;

        }

​

        protected override JsonArrayContract CreateArrayContract(Type objectType)

        {

            var contract = base.CreateArrayContract(objectType);

            contract.ItemTypeNameHandling = RemoveCollectionTypenameHandling(contract.ItemTypeNameHandling, contract.CollectionItemType);

            return contract;

        }

    }

​

    public class DataSourceResult

    {

        public IEnumerable Data { get; set; }

        public IEnumerable Groups { get; set; }

        public object Aggregates { get; set; }

        public int Total { get; set; }

        public object Errors { get; set; }

    }

​

    public class Model

    {

    }

​

    public class Errors

    {

    }

​

    class TestClass

    {

        public static void Test()

        {

            var result = new DataSourceResult

            {

                Data = new List<Model> { new (), new () },

                Groups = new List<List<object>> { new () { new Model () }, new () { new Model (), new object() } },

                Errors = new Errors(),

                Total = 4,

            };

            var resolver = new SuppressCollectionTypeNamesContractResolver();

            var settings = new JsonSerializerSettings

            {

                ReferenceLoopHandling = ReferenceLoopHandling.Ignore,

                ContractResolver = resolver,

                TypeNameHandling = Newtonsoft.Json.TypeNameHandling.Auto,

            };

            var json = JsonConvert.SerializeObject(result, Formatting.Indented, settings);

            Console.WriteLine(json);

​

            Assert.IsTrue(json.Contains("$type"));

            Assert.IsFalse(json.Contains("$values"));

        }

    }

​

    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.Location.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;

        }

    }

​