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 NUnit.Framework; //NUnit.Framework.AssertionException

​

//https://stackoverflow.com/questions/77018646/cant-deserialize-an-element-if-declared-as-attribute-in-my-class-and-appears-as

​

    [XmlRoot("Data")]

    public class Data

    {

        [XmlElement("PB")] public string PB { get; set; }

        [XmlElement("MP")] public string MP { get; set; }

        [XmlElement("Mode")] public string Mode { get; set; }

​

        [XmlAttribute("PB")] public string PBAttribute { get => PB; set => PB = value; }

        [XmlAttribute("MP")] public string MPAttribute { get => MP; set => MP = value; }

        [XmlAttribute("Mode")] public string ModeAttribute { get => Mode; set => Mode = value; }

​

        [XmlIgnore] public bool PBSpecified { get; set; } = false; // Serialize as attributes unless specified.

        [XmlIgnore] public bool MPSpecified { get; set; } = false;

        [XmlIgnore] public bool ModeSpecified { get; set; } = false;

​

        [XmlIgnore] public bool PBAttributeSpecified { get => !PBSpecified; set => PBSpecified = !value; }

        [XmlIgnore] public bool MPAttributeSpecified { get => !MPSpecified; set => MPSpecified = !value; }

        [XmlIgnore] public bool ModeAttributeSpecified { get => !ModeSpecified; set => ModeSpecified = !value; }

    }

​

    [XmlRoot("PInstrument")]

    public class PInstrument 

    {

        public string Type { get; set; }

        public Data Data { get; set; }

    }

​

    [XmlRoot("Response")]

    public class Response 

    {

        public PInstrument PInstrument { get; set; }

    }

​

    public class TestClass

    {

        public static void Test()

        {

            foreach (var xml in GetXml())

            {

                Console.WriteLine("\nFor input XML:");

                Console.WriteLine(xml);

                var response = xml.LoadFromXml<Response>();

                var newXml = response.GetXml(omitStandardNamespaces: true);

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

                Console.WriteLine(newXml);

                Assert.That(response.PInstrument.Data.PB == "blabla");

                Assert.That(response.PInstrument.Data.MP == "blabla");

                Assert.That(response.PInstrument.Data.Mode == "blabla");

                Assert.That(XNode.DeepEquals(XElement.Parse(xml), XElement.Parse(newXml)));

            }

        }

        static IEnumerable<string> GetXml() => new []

        {

            """

            <?xml version="1.0" encoding="UTF-8"?>

            <Response>

                <PInstrument>

                    <Type>myType</Type>

                    <Data>

                        <PB>blabla</PB>

                        <MP>blabla</MP>

                        <Mode>blabla</Mode>

                    </Data>

                </PInstrument>

            </Response>

            """,

            """

            <?xml version="1.0" encoding="UTF-8"?>

            <Response>

                <PInstrument>

                    <Type>myType</Type>

                    <Data PB="blabla" MP="blabla" Mode="blabla" />

                </PInstrument>

            </Response>

            """,

        };

    }

​

    public static class XmlSerializationHelper

    {

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

        {

            using (var reader = new StringReader(xmlString))

            {

                return (T)(serial ?? new XmlSerializer(typeof(T))).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 class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: {0} ({1}, {2}, NewLine: {3}).", 

                              System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription , Environment.Version, Environment.OSVersion,

                              System.Text.Json.JsonSerializer.Serialize(Environment.NewLine));

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

                Console.WriteLine("Failed with unhandled exception: ");

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​