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/57030272/how-to-customize-value-setting-during-deserialization-with-contract-resolver-and

​

    public class MyCustomContractResolver

        : DefaultContractResolver

    {

        public MyCustomContractResolver()

        {

            NamingStrategy = new CamelCaseNamingStrategy();

        }

​

        protected override IList<JsonProperty> CreateProperties(Type type, MemberSerialization memberSerialization)

        {

            var jsonProperties = base.CreateProperties(type, memberSerialization);

​

            foreach (var jsonProperty in jsonProperties)

            {

                var propertyInfo = type.GetProperty(jsonProperty.UnderlyingName);

                var defaultValueProvider = jsonProperty.ValueProvider;

                jsonProperty.ValueProvider = new MyValueProvider(defaultValueProvider);

            }

​

            return jsonProperties;

        }

    }

​

    public class MyValueProvider

        : IValueProvider

    {

        private readonly IValueProvider _valueProvider;

​

        public MyValueProvider(IValueProvider valueProvider)

        {

            _valueProvider = valueProvider;

        }

​

        public void SetValue(object target, object value)

        {

            //This is not executed during deserialization. Why?

            _valueProvider.SetValue(target, value);

            Console.WriteLine("Value set: {0}", value);

        }

​

        public object GetValue(object target)

        {

            var value = _valueProvider.GetValue(target);

            Console.WriteLine("Value get: {0}", value);

            return value;

        }

    }

​

    public class SampleMessage

    {

        readonly string text;

        readonly int number;

        public string Text { get { return text; } }

        public int Number { get { return number; } }

        public SampleInner SampleInner { get; set; }

​

        public SampleMessage(string text, int number, SampleInner sampleInner)

        {

            this.text = text;

            this.number = number;

            SampleInner = sampleInner;

        }

    }

​

    public class SampleInner

    {

        [JsonProperty] // Adding this attribute informs Json.NET that the private setter can be called.

        public string AnotherText { get; private set; }

​

        [JsonProperty]

        public int AnotherNumber { get; private set; }

​

        [JsonConstructor] // Adding this attribute informs Json.NET that this private constructor can be called

        private SampleInner() { }

        public SampleInner(string anotherText, int anotherNumber)

        {

            this.AnotherText = anotherText;

            this.AnotherNumber = anotherNumber;

        }       

    }

​

    class TestClass

    {

        private static JsonSerializerSettings GetJsonSettings(IContractResolver contractResolver)

        {

            var jsonSettings =

                new JsonSerializerSettings

                {

                    ContractResolver = contractResolver

                };

            return jsonSettings;

        }

        public static void Test()

        {

            var text = "This is text";

            var number = 1;

            var anotherText = "This is another text";

            var anotherNumber = 2;

            var sampleInner = new SampleInner(anotherText, anotherNumber);

            var sample = new SampleMessage(text, number, sampleInner);

​

            var myCustomContractResolver = new MyCustomContractResolver();

            var jsonSettings = GetJsonSettings(myCustomContractResolver);

​

            Console.WriteLine("Serializing..");

            var json = JsonConvert.SerializeObject(sample, jsonSettings);

            Console.WriteLine(json);

​

            Console.WriteLine("Deserializing..");

            var sampleDeserialized = JsonConvert.DeserializeObject(json, typeof(SampleMessage), jsonSettings);

            Console.WriteLine(".. done.");

        }   

    }

​

    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;

            }

        }

    }

​