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/68496044/custom-converter-for-deserialization-not-firing-or-not-hitting-break-point-in-we

​

    class KipReport

    {

        public string Name { get; set; }

        public DateTime? MonthWorked { get; set; }

        public DateTime? LastEditDate { get; set; }

    }

​

    class MultiFormatDateConverter : JsonConverter

    {

        public List<string> DateTimeFormats { get; set; } = new ();

​

        public override bool CanConvert(Type objectType) => 

            objectType == typeof(DateTime) || objectType == typeof(DateTime?);

​

        public override bool CanWrite => false;

​

        public override void WriteJson(JsonWriter writer, object value, Newtonsoft.Json.JsonSerializer serializer) => throw new NotImplementedException();

​

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

        {

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

                return objectType == typeof(DateTime?) ? null : throw new System.Text.Json.JsonException("Unable to parse null as a date.");

            else if (reader.TokenType != JsonToken.String)

                throw new System.Text.Json.JsonException("Unable to parse token \"" + reader.TokenType + "\" as a date.");

            string dateString = (string)reader.Value;

            foreach (string format in DateTimeFormats)

            {

                // adjust this as necessary to fit your needs

                if (DateTime.TryParseExact(dateString, format, CultureInfo.InvariantCulture, DateTimeStyles.None, out var date))

                    return date;

            }

            throw new System.Text.Json.JsonException("Unable to parse \"" + dateString + "\" as a date.");

        }

    }

​

    public static partial class JsonExtensions

    {

        public static JsonReader MoveToContent(this JsonReader reader)

        {

            while ((reader.TokenType == JsonToken.Comment || reader.TokenType == JsonToken.None) && reader.Read())

                ;

            return reader;

        }

    }

​

    class TestClass

    {

        public static void Test()

        {

            var responseBody = GetJson();

            var settings = new JsonSerializerSettings();

            settings.DateParseHandling = DateParseHandling.None;

            settings.Converters.Add(new MultiFormatDateConverter

                {

                     DateTimeFormats = { "yyyyMMddTHHmmssZ", "yyyy-MM-ddTHH:mm","MMMM yyyy","dd/MM/yyyy","dd/MM/yy","MMM-yy","MMM yy" }

                });

            List<KipReport> rpt730 = JsonConvert.DeserializeObject<List<KipReport>>(responseBody, settings);

            rpt730.Dump();

        }   

        static string GetJson()

        {

            return @"[

  {

    ""Name"":""Alex"",

    ""MonthWorked"":""January 2021"",

    ""LastEditDate"":""16/02/2021"",

    ""LastEditBy"":""san""

  }

]

";

        }

    }

​

    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;

        }

    }

​