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.IO.Compression;

using System.Reflection;

​

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

​

//https://stackoverflow.com/questions/62884134/how-to-deserialize-child-elements-of-different-types-into-list-collection-of-bas

​

    public interface IHasThings

    {

        List<SomeThing> ChildThings { get; set; }

    }

​

    [XmlRoot("Things")]

    public class Things : IHasThings

    {

        [XmlElement(typeof(ThingOne), ElementName = "ThingOne")]

        [XmlElement(typeof(ThingTwo), ElementName = "ThingTwo")]

        public List<SomeThing> ChildThings { get; set; } = new List<SomeThing>();

    }

​

    public abstract class SomeThing : IHasThings

    {

        [XmlIgnore]

        public int ItemNumber { get; set; }

​

        [XmlAttribute]

        public string Name {get; set;}

​

        [XmlElement(typeof(ThingOne), ElementName = "ThingOne")]

        [XmlElement(typeof(ThingTwo), ElementName = "ThingTwo")]

        public List<SomeThing> ChildThings {get; set;} = new List<SomeThing>();

​

        public abstract void InspectChildren();

    }

​

    public sealed class ThingOne : SomeThing

    {

        public override void InspectChildren()

        {

            Console.WriteLine("Called {0}.{1}", GetType().Name, nameof(InspectChildren));

        }

    }

​

    public sealed class ThingTwo : SomeThing

    {

        public override void InspectChildren()

        {

            Console.WriteLine("Called {0}.{1}", GetType().Name, nameof(InspectChildren));

        }

    }

​

    public class TestClass

    {

        public static void Test()

        {

            TestDeserialize();

            TestSerialize();

        }

        static void TestDeserialize()

        {

            var xml = @"<Things>

    <ThingOne Name=""FirstThing"">

        <ThingOne Name=""FirstChildThing"" />

        <ThingTwo Name=""SecondChildThing""/>

    </ThingOne>

    <ThingTwo Name=""SecondThing"">

        <ThingOne Name=""ThirdChildThing""  />

        <ThingTwo Name=""FourthChildThing"" />

    </ThingTwo>

</Things>";

            Console.WriteLine("Testing deserialization.  Input XML:");

            Console.WriteLine(xml);

            var things = xml.LoadFromXml<Things>();

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

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

            Console.WriteLine("Re-serialized {0}:", things);

            Console.WriteLine(xml2);

        }

        static void TestSerialize()

        {

            var things = new Things

            {

                ChildThings = 

                {

                    new ThingOne 

                    {

                        Name = "FirstThing",

                        ChildThings = 

                        {

                            new ThingOne { Name = "FirstChildThing" }, new ThingTwo { Name = "SecondChildThing" },

                        },

                    },

                    new ThingTwo 

                    {

                        Name = "SecondThing",

                        ChildThings = 

                        {

                            new ThingOne { Name = "ThirdChildThing" }, new ThingTwo { Name = "FourthChildThing" },

                        },

                    },

                },

            };

            var xml = things.GetXml(omitStandardNamespaces: true);

​

            Console.WriteLine("\nTesting serialization for {0}:", things);

            Console.WriteLine(xml);

            var things2 = xml.LoadFromXml<Things>();

            var xml2 = things2.GetXml(omitStandardNamespaces: true);

            Assert.AreEqual(xml, xml2);

            Console.WriteLine("Round-trip successful.");

        }

    }

​

    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 static class XmlAssert

    {

        // https://weblogs.asp.net/marianor/easy-way-to-compare-two-xmls-for-equality

        // https://stackoverflow.com/questions/7318157/best-way-to-compare-xelement-objects

        // Adapted from the answer https://stackoverflow.com/a/14463137 by https://stackoverflow.com/users/1102100/robjohnson

        public static void AreEqual(

            XElement expected,

            XElement actual)

        {

            Assert.IsTrue(XNode.DeepEquals(Normalize(expected), Normalize(actual)));

        }

​

        private static XElement Normalize(XElement element)

        {

            if (element.HasElements)

            {

                return new XElement(

                    element.Name,

                    element.Attributes()

                           .OrderBy(a => a.Name.ToString()),

                    element.Elements()

                           .OrderBy(a => a.Name.ToString())

                           .Select(e => Normalize(e)));

​

            }

​

            if (element.IsEmpty)

            {

                return new XElement(

                    element.Name,

                    "",

                    element.Attributes()

                           .OrderBy(a => a.Name.ToString()));

            }

​

            return new XElement(element.Name, element.Attributes()

                .OrderBy(a => a.Name.ToString()), element.Value);

        }

    }

    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;

        }

    }

​