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 NUnit.Framework; //NUnit.Framework.AssertionException

​

//https://stackoverflow.com/questions/76744612/xmlserializer-for-xml-with-hybrid-elements

​

    [XmlRoot("SyncML", Namespace = "SYNCML:SYNCML1.2")]

    public class SyncML

    {

        [XmlElement]

        public SyncHdr SyncHdr { get; set; }

​

        [XmlArray("SyncBody")]

        [XmlArrayItem("Status", Type = typeof(StatusCommand))]

        [XmlArrayItem("Get", Type = typeof(GetCommand))]

        [XmlArrayItem("Final", Type = typeof(FinalCommand))]

        public List<SyncCommandBase> SyncBody { get; set; } = new ();

    }

​

    public class SyncHdr

    {

        [XmlElement("VerDTD")]

        public string VerDtd { get; set; }

​

        [XmlElement("VerProto")]

        public string VerProto { get; set; }

​

        // etc.

    }

​

    public abstract class SyncCommandBase

    {

    }

​

    public abstract class SyncCommand : SyncCommandBase

    {

        [XmlElement("CmdID")]

        public int CmdId { get; set; }

    }

​

    public class StatusCommand : SyncCommand

    {

        [XmlElement("MsgRef")]

        public int MsgRef { get; set; }

​

        [XmlElement("CmdRef")]

        public int CmdRef { get; set; }

    }

​

    public class GetCommand : SyncCommand

    {

        [XmlElement(ElementName="Item")]

        public List<Item> Item { get; set; }

    }

​

    public class Item

    {

        [XmlElement("Target")]

        public Location Target { get; set; }

    }

​

    public class Location

    {

        [XmlElement("LocURI")]

        public string LocUri { get; set; }

    }

​

    public class FinalCommand : SyncCommandBase

    {

    }

​

    public class TestClass

    {

        public static void Test()

        {

            var xml = GetXml();

            var root = xml.LoadFromXml<SyncML>();

            var xml2 = root.GetXml();

            Console.WriteLine(xml2);

        }

        static string GetXml() =>

            """

            <SyncML xmlns="SYNCML:SYNCML1.2">

                <SyncHdr>

                    <VerDTD>1.2</VerDTD>

                    <VerProto>DM/1.2</VerProto>

                    <!-- etc. -->

                </SyncHdr>

                <SyncBody>

                    <Status>

                        <CmdID>100</CmdID>

                        <MsgRef>1</MsgRef>

                        <CmdRef>0</CmdRef>

                        <!-- etc. -->

                    </Status>

                    <Status>

                        <CmdID>103</CmdID>

                        <MsgRef>1</MsgRef>

                        <CmdRef>4</CmdRef>

                        <!-- etc. -->

                    </Status>

                    <Get>

                        <CmdID>104</CmdID>

                        <Item>

                            <Target>

                                <!-- etc. -->

                            </Target>

                        </Item>

                        <Item>

                            <Target>

                                <!-- etc. -->

                            </Target>

                        </Item>

                    </Get>

                    <Get>

                        <CmdID>105</CmdID>

                        <Item>

                            <Target>

                                <!-- etc. -->

                            </Target>

                        </Item>

                        <Item>

                            <Target>

                                <!-- etc. -->

                            </Target>

                        </Item>

                    </Get>

                    <Final/>

                </SyncBody>

            </SyncML>

            """;

    }

​

    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, bool omitStandardNamespaces)

        {

            return obj.GetXml(null, omitStandardNamespaces);

        }

        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})", System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription , Environment.Version, Environment.OSVersion);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

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

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​