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 System.Text.Json;

using System.Text.Json.Serialization;

​

using NUnit.Framework; // Throws NUnit.Framework.AssertionException

​

//https://stackoverflow.com/questions/73980433/issue-with-deserialization-of-enum-to-string-using-system-text-json/75410434#75410434

​

#nullable enable

​

    public class Customer

    {

        public string? id { get; set; }

​

        public string? Name { get; set; }

​

        public string Address { get; set; }

​

        [JsonConverter(typeof(JsonStringEnumConverter))]

        public CustomerType Type {get; set;}

​

        [JsonConverter(typeof(JsonStringEnumConverter))]

        public enum CustomerType

        {

            NEW,

            EXISTING

        }       

    }

​

    class TestClass

    {

        public static void Test()

        {

            var customer = new Customer

            {

                id = "1",

                Name = "my name",

                Address = "my address",

                Type = Customer.CustomerType.EXISTING,

            };

            var json = JsonSerializer.Serialize(customer, new JsonSerializerOptions { WriteIndented = true });

            Console.WriteLine(json);

            var customer2 = JsonSerializer.Deserialize<Customer>(json);

            Assert.AreEqual(customer?.Type, customer2?.Type);

​

            var json2 = JsonSerializer.Serialize(customer2, new JsonSerializerOptions { WriteIndented = true });

​

            Console.WriteLine("Round-tripped {0}:", customer2);

            Console.WriteLine(json2);

        }   

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: {0} ({1}), {2}", System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription , Environment.Version, Environment.OSVersion);

            Console.WriteLine("System.Text.Json version: " + typeof(JsonSerializer).Assembly.FullName);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

                Console.WriteLine("Failed with unhandled exception: ");

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​

​

​