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/62111182/removing-properties-from-json-files-that-are-not-in-strongly-typed-class

​

    public class AppSettings

    {

        public string Dsn { get; set; }

        public string Uid { get; set; }

        public string Pwd { get; set; }

        public string ProviderName { get; set; }

    }

​

    class TestClass

    {

        public static void Test()

        {

            var file2 = "Question62111182.json";

​

            File.WriteAllText(file2, GetJson());

            string json = File.ReadAllText(file2);

            var jsonObj = JsonConvert.DeserializeAnonymousType(json, new { AppSettings = default(AppSettings) });

            string jsonString = JsonConvert.SerializeObject(jsonObj);

            File.WriteAllText(file2, jsonString);       

            Console.WriteLine(File.ReadAllText(file2));

​

            Assert.IsTrue(!File.ReadAllText(file2).Contains("\"Name\""));

        }   

        static string GetJson()

        {

            return @"{

  ""AppSettings"": {

    ""Name"": ""To be removed"",

    ""Dsn"": ""dsn"",

    ""Uid"": ""uid"",

    ""Pwd"": ""pwd"",

    ""ProviderName"": ""System.Data.Odbc""

  }

}

";

        }

    }

​

    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.CodeBase.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;

        }

    }

​