using System;

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using System.Linq;

​

//https://stackoverflow.com/questions/75147188/how-to-show-the-decimal-value-as-it-is-when-deserializing-using-json-net-in-azur

​

public class Program

{

    public static void Main()

    {

        string json = @"{

                'x1': 1.55391E4,

                'x2': 2.2173244E5,

                'x3': 1.11226E3,

                 'UpdatedDateTime': '2023-01-17T20:45:51.959+08:00'

            }";

        JsonSerializerSettings settings = new JsonSerializerSettings 

        {

            // Make sure that FloatParseHandling is consistent with the later check ".Where(v => v.Value is decimal)"

            FloatParseHandling = FloatParseHandling.Decimal, 

            FloatFormatHandling = FloatFormatHandling.DefaultValue, 

            DateParseHandling = DateParseHandling.DateTimeOffset, 

            DateTimeZoneHandling = DateTimeZoneHandling.Unspecified

        };

        JObject obj = JsonConvert.DeserializeObject<JObject>(json, settings);

​

        var decimalValues = obj.Descendants().OfType<JValue>().Where(v => v.Value is decimal).ToList();

        foreach (var value in decimalValues)

        {

            value.Replace(new JRaw(((decimal)value.Value).ToString("0.00000E0" /*, System.Globalization.CultureInfo.InvariantCulture */))); // Is System.Globalization.CultureInfo.InvariantCulture available?

        }

        Console.WriteLine(obj.ToString());

    }

}