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; }

    }

​

    public partial class MyClass // Members I added for testing

    {

        [JsonIgnore]

        public string IgnoreMe { get; set; }

        public string SomeField;

        [JsonProperty("LongNumber")]

        public long LongField;

    }

​

    public partial class MyClassDTO

    {

        public string C { get; set; }

        public string D { get; set; }

    }

​

    public partial class MyClassDTO // Members I added for testing

    {

        public string IgnoreMe { get; set; }

        public string SomethingNotInTheOriginalClass { get; set; }

        public string SomeField;

        public long LongNumber { get; set; }

    }

​

    public static class AutomapperJsonExtensions

    {

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

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

        {

            resolver = resolver ?? defaultResolver;

            var srcContract = resolver.ResolveContract(typeof(TSource)) as JsonObjectContract ?? throw new ArgumentException("Source was not a JSON object.");

​

            var dstMemberQuery = typeof(TDestination).GetProperties()

                .Where(p => p.GetIndexParameters().Length == 0 && p.GetGetMethod(true) != null && p.CanRead && p.GetSetMethod() != null && p.CanWrite)

                .Select(p => p.Name)

                // Include public fields also if you prefer since Json.NET serializes these also.

                .Concat(typeof(TDestination).GetFields().Select(f => f.Name));

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

            foreach (var member in dstMemberQuery)

            {

                map.ForMember(member, opt => 

                              { 

                                  var property = srcContract.Properties.GetClosestMatchProperty(member);

                                  if (property == null || property.Ignored)

                                      opt.Ignore();

                                  else

                                  {

                                      opt.MapFrom(property.UnderlyingName);

                                  }

                              } );

            }

        }

    }

​

    class TestClass

    {

        public static void Test()

        {

            var config = new MapperConfiguration(cfg =>

            {

                cfg.CreateJsonObjectMap<MyClass, MyClassDTO>();

            });

            var mapper = config.CreateMapper();

            var source = new MyClass

            {

                A = "value of A",

                B = "value of B",

                IgnoreMe = "Ignore Me",

                SomeField = "value of SomeField",

                LongField = long.MaxValue,

            };

            var dto = mapper.Map<MyClassDTO>(source);

​

            dto.Dump();

            Assert.AreEqual(source.A, dto.C);

            Assert.AreEqual(source.B, dto.D);

            Assert.AreEqual(null, dto.IgnoreMe);

            Assert.AreEqual(source.SomeField, dto.SomeField);

            Assert.AreEqual(null, dto.SomethingNotInTheOriginalClass);

            Assert.AreEqual(source.LongField, dto.LongNumber);

        }   

    }

​

    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;

        }

    }

​