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/54066654/array-declared-in-defaultvalue-not-ignored-while-serializing

    //

​

    class A

    {

        static readonly int[] SomeArrayDefaultValue = new int[] { 4, 6, 12 };

​

        // Disable global settings for NullValueHandling and DefaultValueHandling

        [JsonProperty(NullValueHandling = NullValueHandling.Include, DefaultValueHandling = DefaultValueHandling.Include)]

        public int[] SomeArray = (int[])SomeArrayDefaultValue.Clone();

​

        public bool ShouldSerializeSomeArray()

        {

            return !(SomeArray != null && SomeArray.SequenceEqual(SomeArrayDefaultValue));

        }

    }

​

    class TestClass

    {

        public static void Test()

        {

            Console.WriteLine("\nTesting simple fix using ShouldSerializeXXX() functionality.");

            TestOriginal();

            TestWeird();

        }

​

        public static void TestOriginal()

        {

            var serializerSettings = new JsonSerializerSettings

            {

                DefaultValueHandling = DefaultValueHandling.IgnoreAndPopulate,

            };

            var a = new A();

            JsonConvert.PopulateObject("{}", a, serializerSettings);

​

            Console.WriteLine(JsonConvert.SerializeObject(a, serializerSettings));

            Assert.IsTrue(JsonConvert.SerializeObject(a, serializerSettings) == "{}");

​

            a.SomeArray = new int[] { 4, 6, 12 };

            Console.WriteLine(JsonConvert.SerializeObject(a, serializerSettings));

            Assert.IsTrue(JsonConvert.SerializeObject(a, serializerSettings) == "{}");

        }

​

        static void TestWeird()

        {

            var serializerSettings = new JsonSerializerSettings

            {

                DefaultValueHandling = DefaultValueHandling.IgnoreAndPopulate,

            };

            var a1 = JsonConvert.DeserializeObject<A>("{}", serializerSettings);

            Assert.IsTrue(a1.SomeArray.SequenceEqual(new int[] { 4, 6, 12 }));

​

            a1.SomeArray[0] = -999;

​

            var a2 = JsonConvert.DeserializeObject<A>("{}", serializerSettings);

            Assert.IsTrue(a2.SomeArray.SequenceEqual(new int[] { 4, 6, 12 }));

        }

    }

​

    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;

            }

        }

    }

​