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(); }

​

        static ObjectConstructor<Object> GetParameterizedConstructor(JsonObjectContract contract)

        {

            if (contract.OverrideCreator != null)

                return contract.OverrideCreator;

            // Here we assume that JsonSerializerSettings.ConstructorHandling == ConstructorHandling.Default

            // If you would prefer AllowNonPublicDefaultConstructor then you need to remove the check on contract.DefaultCreatorNonPublic

            if (contract.CreatorParameters.Count > 0 && (contract.DefaultCreator == null || contract.DefaultCreatorNonPublic))

            {

                // OK, Json.NET has a parameterized constructor stashed away in JsonObjectContract.ParameterizedCreator

                // https://github.com/JamesNK/Newtonsoft.Json/blob/master/Src/Newtonsoft.Json/Serialization/JsonObjectContract.cs#L100

                // But, annoyingly, this value is internal so we cannot get it!

                // But because CreatorParameters.Count > 0 and OverrideCreator == null we can infer that such a constructor exists, and so call it using Activator.CreateInstance

                return (args) => Activator.CreateInstance(contract.CreatedType, BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance, null, args, CultureInfo.InvariantCulture);

            }

            return null;

        }

​

        static ObjectConstructor<Object> CustomizeConstructor(JsonObjectContract contract, ObjectConstructor<Object> constructor)

        {

            if (constructor == null)

                return null;

            return (args) =>

            {

                // Add here your customization logic.

                // You can match creator parameters to properties by property name if needed.

                foreach (var pair in args.Zip(contract.CreatorParameters, (a, p) => new { Value = a, Parameter = p }))

                {

                    // Get the corresponding property in case you need to, e.g., check its attributes:

                    var property = contract.Properties[pair.Parameter.PropertyName];

                    if (property == null)

                        Console.WriteLine("Argument {0}: Value {1}", pair.Parameter.PropertyName, pair.Value);

                    else

                        Console.WriteLine("Argument {0} (corresponding to JsonProperty {1}): Value {2}", pair.Parameter.PropertyName, property, pair.Value);

                }

                return constructor(args);

            };

        }

​

        protected override JsonObjectContract CreateObjectContract(Type objectType)

        {

            var contract = base.CreateObjectContract(objectType);

            contract.OverrideCreator = CustomizeConstructor(contract, GetParameterizedConstructor(contract));

            return contract;

        }

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

        {

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

​

            foreach (var jsonProperty in jsonProperties)

            {

                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;

        }

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        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; }

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

        {

            this.text = text;

            this.number = number;

            SampleInner = sampleInner;

        }

    }

​

    public class SampleInner

    {

        string anotherText;

        int anotherNumber;

        public string AnotherText { get { return anotherText; } }

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        public int AnotherNumber { get { return anotherNumber; } }

​

        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);

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            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;

            }

        }

    }

​