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

​

using AutoMapper;

using AutoMapper.Configuration;

​

//https://stackoverflow.com/questions/62199220/how-to-configure-automapper-using-jsonproperty-attribute

​

    public partial class MyClass

    {

         [JsonProperty("C")]

         public string A { get; set; }

         [JsonProperty("D")]

         public string B { get; set; }

​

         [JsonProperty("Long")]          

         public long LongNumber { get; set; }

         [JsonProperty("Int")]           

         public int IntNumber { get; set; }

         [JsonProperty("Short")]             

         public short ShortNumber { get; set; }

​

        [JsonIgnore]

        public string IgnoreMe { get; set; }

    }

​

    public static class AutomapperJsonExtensions

    {

        static readonly IContractResolver defaultResolver = new JsonSerializer().ContractResolver;

        public static void CreateJsonDataReaderMap<TDestination>(this IMapperConfigurationExpression cfg, IContractResolver resolver = null)

        {

            resolver = resolver ?? defaultResolver;

            var contract = resolver.ResolveContract(typeof(TDestination)) as JsonObjectContract ?? throw new ArgumentException(string.Format("{0} is not a JSON object.", typeof(TDestination)));

​

            var map = cfg.CreateMap<IDataRecord, TDestination>();

​

            foreach (var p in contract.Properties.Where(p => !p.Ignored && p.Writable))

            {

                // Map PropertyName in reader to UnderlyingName in TDestination

                map.ForMember(p.UnderlyingName, opt => opt.MapFrom(r => r[p.PropertyName] ));

            }

        }

    }

​

    class TestClass

    {

        public static void Test()

        {

            var inputs = new [] 

            {

                new MyClass { A = "a1", B = "b1", LongNumber = 1, IntNumber  = 1, ShortNumber = 1 },

                new MyClass { A = "a2", B = "b2", LongNumber = long.MaxValue, IntNumber = int.MaxValue, ShortNumber = short.MaxValue },

            };

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

            Console.WriteLine(json);

            var table = JsonConvert.DeserializeObject<DataTable>(json);

            var config = new MapperConfiguration(cfg =>

            {

                cfg.CreateJsonDataReaderMap<MyClass>();

            });

            var mapper = config.CreateMapper();

            using var reader = table.CreateDataReader();

            var result = mapper.Map<List<MyClass>>(reader);

​

            result.Dump();

            Assert.AreEqual(result.Count, inputs.Length);

            var newJson = JsonConvert.SerializeObject(result, Formatting.Indented);

            Assert.IsTrue(JToken.DeepEquals(JToken.Parse(json), JToken.Parse(newJson)));

            Assert.Throws<ArgumentException>(() => new MapperConfiguration(cfg => cfg.CreateJsonDataReaderMap<string>()));

            Assert.Throws<ArgumentException>(() => new MapperConfiguration(cfg => cfg.CreateJsonDataReaderMap<List<MyClass>>()));

        }   

    }

​

    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("{0} version: {1}", typeof(MapperConfiguration).Assembly.GetName().Name,  typeof(MapperConfiguration).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.CodeBase.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;

        }

    }

​