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/69499790/net-core-3-1-api-to-accept-complext-xml-object

​

    public static partial class DataContractSerializerHelper

    {

        public static string ToContractXml<T>(this T obj, DataContractSerializer serializer = null, XmlWriterSettings settings = null)

        {

            serializer = serializer ?? new DataContractSerializer(obj == null ? typeof(T) : obj.GetType());

            using (var textWriter = new StringWriter())

            {

                settings = settings ?? new XmlWriterSettings { Indent = true };

                using (var xmlWriter = XmlWriter.Create(textWriter, settings))

                {

                    serializer.WriteObject(xmlWriter, obj);

                }

                return textWriter.ToString();

            }

        }

​

        public static T FromContractXml<T>(string xml, DataContractSerializer serializer = null)

        {

            using (var textReader = new StringReader(xml ?? ""))

            using (var xmlReader = XmlReader.Create(textReader))

            {

                return (T)(serializer ?? new DataContractSerializer(typeof(T))).ReadObject(xmlReader);

            }

        }

    }

​

    [DataContract(Namespace = "")]

    [XmlRoot]

    public class Object1

    {

     [DataMember(Name = "field1")]

     public string field1 {get; set;}

     [DataMember(Name = "field2")]

     public Object2 field2 {get; set;}

    }

​

    [DataContract(Name = "field2", IsReference = true)]

    public class Object2

    {

     [DataMember(Name = "field3")]

     public string field3 {get; set;}

     [DataMember(Name = "field4")]

     public Object3 field4 {get; set;}

    }

​

    [DataContract(Name = "field3", IsReference = true)]

    public class Object3

    {

     [DataMember(Name = "field5")]

     public string field5 {get; set;}

     [DataMember(Name = "field6")]

     public string field6 {get; set;}

    }

​

    public class TestClass

    {

        public static void Test()

        {

            var dataContractObject = new Object1

            {

                field1 = "Hello",

                field2 = new()

                {

                    field3 = "World",

                    field4 = new ()

                    {

                        field5 = "Test",

                        field6 = "Test2",

                    },

                },

            };

​

            var xml = dataContractObject.ToContractXml();

            Console.WriteLine(xml);

        }

        static string GetXml() => @"<?xml version=""1.0"" encoding=""UTF-8""?>

<Object1>

   <field1>Hello</field1>

   <field2>

      <field3>World</field3>

      <field4>

         <field5>Test</field5>

         <field6>Test2</field6>

      </field4>

   </field2>

</Object1>

";

    }

​

    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.Location.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;

        }

    }

​