using System;

using Newtonsoft.Json;

using Newtonsoft.Json.Converters;

​

public class Program

{

    public static void Main()

    {

        var a = """

            {

                "x": "SourceSystem_Datatrans"

            }

            """;

        JsonConvert.DeserializeObject<A>(a, new JsonSerializerSettings { Converters = [new CustomConverter { }] }).Dump();

    }

}

​

public class A

{

    public X X { get; set; }

}

​

public enum X

{

    SourceSystemDatatrans,

    SourceSystemIntegra

}

​

public class CustomConverter : JsonConverter

{

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

    {

        // Convert the enum to a string and write it as JSON

        writer.WriteValue(value?.ToString());

    }

​

    public override object ReadJson(JsonReader reader, Type objectType, object? existingValue,

        JsonSerializer serializer)

    {

        if ( reader.TokenType == JsonToken.String )

        {

            var stringValue = reader.Value?.ToString();

            // Remove underscores and convert to enum

            var cleanedValue = stringValue?.Replace("_", "");

            if ( Enum.IsDefined(objectType, cleanedValue!) )

            {

                return Enum.Parse(objectType, cleanedValue!, true);

            }

        }

​

        throw new JsonSerializationException($"Unable to convert {reader.Value} to {objectType}");

    }

​

    public override bool CanConvert(Type objectType)

    {

        // This converter applies only to enums

        return objectType.IsEnum;

    }

}