using System;

using System.Collections.Generic;

using System.Text;

using System.Linq;

using System.Xml.Serialization;

using System.Xml;

using System.Xml.Linq;

using System.IO;

using System.Data;

using System.Runtime.Serialization;

using System.Runtime.Serialization.Formatters.Binary;

using System.IO.Compression;

using System.Reflection;

​

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

​

//https://stackoverflow.com/questions/58524017/keep-n-in-xml-serialization-in-c-sharp

​

    public class Abc

    {

      private String text;

​

      public String Text

      {

        get { return this.text; }

        set { this.text = value; }

      }

    }

​

    public class TestClass

    {

        public static String SerializeObject(Object pObject)

        {

            String XmlizedString = null;

            MemoryStream memoryStream = new MemoryStream();

            XmlSerializer xs = new XmlSerializer(pObject.GetType());

​

            XmlTextWriter xmlTextWriter = new XmlTextWriter(memoryStream, Encoding.Unicode);

​

            xs.Serialize(xmlTextWriter, pObject);

            //The following was not included in the question

            //XmlizedString = UTF16ByteArrayToString(memoryStream.ToArray());

​

            XmlizedString = Encoding.Unicode.GetString(memoryStream.ToArray());

​

            return XmlizedString.Trim();

        }       

​

        public static void Test()

        {

            var abc = new Abc { Text = "Line1\nLine2\r\nLine3\rLine4\n\rLineEnd" };

            var xml = SerializeObject(abc);

            Console.WriteLine(xml);

            Assert.IsTrue(xml.Count(c => c == '\n') == abc.Text.Count(c => c == '\n'));

            Assert.IsTrue(xml.Count(c => c == '\r') == abc.Text.Count(c => c == '\r'));

            Console.WriteLine();

            Console.WriteLine("Environment.NewLine = {0}", System.Text.RegularExpressions.Regex.Escape(Environment.NewLine));

            Console.WriteLine("\\r = {0}", ((byte)'\r').ToString("x2"));

            Console.WriteLine("\\n = {0}", ((byte)'\n').ToString("x2"));

            //https://www.w3.org/TR/REC-xml/#sec-line-ends

            //

            //XML parsed entities are often stored in computer files which, for editing convenience, are organized into lines. 

            //These lines are typically separated by some combination of the characters CARRIAGE RETURN (#xD) and LINE FEED (#xA).

            //

            //To simplify the tasks of applications, the XML processor MUST behave as if it normalized all line breaks in external parsed entities 

            //(including the document entity) on input, before parsing, 

            //by translating both the two-character sequence #xD #xA and any #xD that is not followed by #xA to a single #xA character.

        }

    }

​

    public class Program

    {

        public static void Main()

        {

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

            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;

        }

    }

​