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 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/57197626/how-does-json-net-set-a-get-only-ienumerablet-property

​

    class Foo

    {

        private readonly List<string> _values;

        public Foo(IEnumerable<string> values)

        {

            _values = values.ToList();

        }

​

        [JsonConstructor]

        private Foo()

        {

            _values = new List<string>();

        }

​

        public IEnumerable<string> Values { get { return _values.AsReadOnly(); } }

    }

​

    class TestClass

    {

        public static void Test()

        {

            var json = @"{""Values"":[""One"",""Two"",""Three""]}";

            var deserializedFoo = JsonConvert.DeserializeObject<Foo>(json);

            Assert.IsTrue(deserializedFoo.Values.Count() == 0);

            Console.WriteLine( JsonConvert.SerializeObject(deserializedFoo));

        }   

        static string GetJson()

        {

            var json = @"

";

            return json;

        }

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: " + Environment.Version);

            Console.WriteLine("Json.NET version: " + typeof(JsonSerializer).Assembly.FullName);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

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

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​