using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

​

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/59665339/newtonsoft-json-net-disable-scientific-notation

​

    public class MyClass

    {

        public double MyNumber { get; set; }

    }

​

    class TestClass

    {

        public static void Test()

        {

            // Create an instance of MyClass with a large number

            var myObject = new MyClass { MyNumber = 1234567890123456789.0 };

​

            // Create JsonSerializerSettings with FloatFormatHandling and DoubleFormatHandling set to StringFormatHandling.Default

            var settings = new JsonSerializerSettings

            {

                FloatFormatHandling = FloatFormatHandling.String,

                DoubleFormatHandling = DoubleFormatHandling.String

            };

​

            // Serialize the object with the settings

            var json = JsonConvert.SerializeObject(myObject, Formatting.None, settings);

​

            // Output the JSON to the console

            Console.WriteLine(json);            

        }   

    }

​

    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("{0} version: {1}", typeof(JsonSerializer).Namespace, typeof(JsonSerializer).Assembly.FullName);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

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

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​