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/66837533/xmlserializer-deserialize-recursive-object-graph

​

    public class UnitSerializer

    {

        public abstract class item

        {

        }

​

        public class entity : item

        {

            [XmlElement("health", typeof(health))]

            [XmlElement("entity", typeof(entity))]

            [XmlElement("sprite", typeof(sprite))]

            public List<item> EntityList { get; set; }

        }

​

        public abstract class component : item

        {

        }

​

        public class health : component

        {

            [XmlAttribute]

            public int max { get; set; }

        }

​

        public class sprite : component

        {

            [XmlAttribute]

            public string texture { get; set; }

        }

​

        [XmlRoot("units")]

        public class units

        {

            [XmlElement("health", typeof(health))]

            [XmlElement("entity", typeof(entity))]

            [XmlElement("sprite", typeof(sprite))]

            public List<item> EntityList { get; set; }

        }

​

        public units Read(string filename)

        {

            var x = new XmlSerializer(typeof(units));

            using (var fs = new FileStream(filename, FileMode.Open))

            using (var reader = XmlReader.Create(fs))

            {

                return (units)x.Deserialize(reader);

            }

        }

    }

​

    public class TestClass

    {

        public static void Test()

        {

            TestRead();

        }

        static void TestRead()

        {

            var filename = "Question66837533_units.xml";

            try

            {

                File.WriteAllText(filename, GetXml());

                var units = new UnitSerializer().Read(filename);

                var xml2 = units.GetXml(omitStandardNamespaces : true);

                Console.WriteLine(xml2);

                Assert.IsTrue(XNode.DeepEquals(XElement.Parse(GetXml()), XElement.Parse(xml2)));

            }

            finally

            {

                File.Delete(filename);

            }

        }

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

<units>      

  <entity>

    <health max=""1000""/>   

    <sprite texture=""tank""/>

    <entity>        

      <sprite texture=""tank-turret""/> 

    </entity>    

  </entity>         

</units>";

    }

​

    public static class XmlSerializationHelper

    {

        public static T LoadFromXml<T>(this string xmlString, XmlSerializer serial = null)

        {

            serial = serial ?? new XmlSerializer(typeof(T));

            using (var reader = new StringReader(xmlString))

            {

                return (T)serial.Deserialize(reader);

            }

        }

​

        public static string GetXml<T>(this T obj, XmlSerializer serializer = null, bool omitStandardNamespaces = false)

        {

            XmlSerializerNamespaces ns = null;

            if (omitStandardNamespaces)

            {

                ns = new XmlSerializerNamespaces();

                ns.Add("", ""); // Disable the xmlns:xsi and xmlns:xsd lines.

            }           

            using (var textWriter = new StringWriter())

            {

                var settings = new XmlWriterSettings() { Indent = true }; // For cosmetic purposes.

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

                    (serializer ?? new XmlSerializer(obj.GetType())).Serialize(xmlWriter, obj, ns);

                return textWriter.ToString();

            }

        }

        public static string GetOuterXml(this XmlNode node, bool indent = true)

        {

            if (node == null)

                return null;

            using (var textWriter = new StringWriter())

            {

                var settings = new XmlWriterSettings

                {

                    Indent = indent,

                    OmitXmlDeclaration = true,

                };

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

                {

                    node.WriteTo(xmlWriter);

                }

                return textWriter.ToString();

            }

        }

    }

    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;

        }

    }

​