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;

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using System.Text.Json;

​

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

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#nullable enable

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//https://stackoverflow.com/questions/76895249/how-to-create-c-sharp-class-hierarchy-for-xml-with-namespace/

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[XmlRoot("Histogram", Namespace = "Ala ma kota")]

[XmlType(Namespace = "")]

public class Histogram 

{

    public Data Data { get; set; }

}

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[XmlRoot]

public class Data

{

    [XmlAttribute]

    public int Width { get; set; }

​

    [XmlAttribute]

    public int Height { get; set; }

}

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    public static partial class XmlSerializationExtensions

    {

        public static T? Deserialize<T>(this XContainer element, XmlSerializer? serializer = null)

        {

            using (var reader = element.CreateReader())

                return (T?)(serializer ?? new XmlSerializer(typeof(T))).Deserialize(reader);

        }

    }

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    public class TestClass

    {

        public static void Test()

        {

            var outerXmlString = GetXml();

            // Load the XDocument somehow

            //var doc = XDocument.Load(fileName);      // Load from a file.

            var doc = XDocument.Parse(outerXmlString); // Or parse from some already loaded string

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            XNamespace ns = "Ala ma kota";

            var element = doc.Descendants(ns + "Histogram").FirstOrDefault();

            var histogram = element?.Deserialize<Histogram>();

            Console.WriteLine(element?.ToString());

            Console.WriteLine($"\nRe-serialized {histogram}:");

            Console.WriteLine(histogram.GetXml(omitStandardNamespaces : true));

        }

        static string GetXml() =>

            """

            <Root xmlns:c="Ala ma kota">

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            <!-- ... -->

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                    <c:Histogram>

                        <Data Width="10" Height="20" />

                    </c:Histogram>

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            <!-- ... -->

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            </Root>

            """;

    }

​

    public static partial 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);

            }

        }

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

            Console.WriteLine();

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            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

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

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​