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/67241440/jsonconverterattribute-is-not-working-for-deserialization-in-asp-net-core-3-1

​

    [JsonConverter(typeof(DataModelConverter))]

    public class DataModel

    {

        public string Name { get; set; }

        public int Age { get; set; }

    }

​

    public class DataModelConverter : NameRemappingConverterBase

    {

        static string AlternateName => "FullName";

        static string OriginalName => "Name";

​

        public override bool CanConvert(Type objectType) => objectType == typeof(DataModel);

        // Replace the below logic with name mappings from appsettings.json

        protected override string ToJsonPropertyName(JsonProperty property) => 

            string.Equals(property.UnderlyingName, OriginalName, StringComparison.OrdinalIgnoreCase) ? AlternateName : base.ToJsonPropertyName(property);

        protected override string FromJsonPropertyName(string name) => 

            string.Equals(name, AlternateName, StringComparison.OrdinalIgnoreCase) ? OriginalName : base.FromJsonPropertyName(name);

    }

    public abstract class NameRemappingConverterBase : JsonConverter

    {

        protected virtual string ToJsonPropertyName(JsonProperty property) => property.PropertyName;

        protected virtual string FromJsonPropertyName(string name) => name;

        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)

        {

            if (reader.MoveToContentAndAssert().TokenType == JsonToken.Null)

                return null;

            if (reader.TokenType != JsonToken.StartObject)

                throw new JsonSerializationException(string.Format("Unexpected token {0}", reader.TokenType));

            var contract = (JsonObjectContract)serializer.ContractResolver.ResolveContract(objectType);

            var value = existingValue ?? contract.DefaultCreator();

            while (reader.ReadToContentAndAssert().TokenType != JsonToken.EndObject)

            {

                if (reader.TokenType != JsonToken.PropertyName)

                    throw new JsonSerializationException(string.Format("Unexpected token {0}", reader.TokenType));

                var name = FromJsonPropertyName((string)reader.Value);

                reader.ReadToContentAndAssert();

                var property = contract.Properties.GetProperty(name, StringComparison.OrdinalIgnoreCase);

                if (!ShouldDeserialize(property))

                {

                    reader.Skip();

                }

                else

                {

                    var propertyValue = serializer.Deserialize(reader, property.PropertyType);

                    property.ValueProvider.SetValue(value, propertyValue);

                }

            }

            return value;

        }

​

        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)

        {

            var contract = (JsonObjectContract)serializer.ContractResolver.ResolveContract(value.GetType());

            writer.WriteStartObject();

            foreach (var property in contract.Properties.Where(p => ShouldSerialize(p, value)))

            {

                var propertyValue = property.ValueProvider.GetValue(value);

                if (propertyValue == null && serializer.NullValueHandling == NullValueHandling.Ignore)

                    continue;

                var name = ToJsonPropertyName(property);

                writer.WritePropertyName(name);

                serializer.Serialize(writer, propertyValue);

            }

            writer.WriteEndObject();

        }

​

        protected virtual bool ShouldDeserialize(JsonProperty property) =>

            property != null && property.Writable;

​

        protected virtual bool ShouldSerialize(JsonProperty property, object value) =>

            property.Readable && !property.Ignored && (property.ShouldSerialize == null || property.ShouldSerialize(value));

    }

    public static partial class JsonExtensions

    {

        public static JsonReader ReadToContentAndAssert(this JsonReader reader) =>

            reader.ReadAndAssert().MoveToContentAndAssert();

​

        public static JsonReader MoveToContentAndAssert(this JsonReader reader)

        {

            if (reader == null)

                throw new ArgumentNullException();

            if (reader.TokenType == JsonToken.None)       // Skip past beginning of stream.

                reader.ReadAndAssert();

            while (reader.TokenType == JsonToken.Comment) // Skip past comments.

                reader.ReadAndAssert();

            return reader;

        }

​

        public static JsonReader ReadAndAssert(this JsonReader reader)

        {

            if (reader == null)

                throw new ArgumentNullException();

            if (!reader.Read())

                throw new JsonReaderException("Unexpected end of JSON stream.");

            return reader;

        }

    }

​

    class TestClass

    {

        public static void Test()

        {

            var list = new List<DataModel>()

            {

                new DataModel

                {

                    Name="Ramil",

                    Age=25

                },

                new DataModel

                {

                    Name="Yusif",

                    Age=26

                }

            };

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

            Assert.IsTrue(json.Contains("\"FullName\""));

            Assert.IsTrue(!json.Contains("\"Name\""));

            Console.WriteLine(json);

            var list2 = JsonConvert.DeserializeObject<List<DataModel>>(json);

            var json2 = JsonConvert.SerializeObject(list2, Formatting.Indented);

            Assert.AreEqual(json, json2);

            Assert.IsTrue(list.Select(m => m.Name).SequenceEqual(list2.Select(m => m.Name)));

        }   

    }

​

    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;

        }

    }

​