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.Reflection;

​

using Microsoft.VisualStudio.Services.Common;

​

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

​

//https://stackoverflow.com/questions/73127531/how-to-add-a-new-node-to-an-existing-xml-using-c-sharp

    public interface IMyInterface { }

​

    public class SerializableDictWithGuid<T1, T2> : SerializableDictionary<T1, T2>, IMyInterface, IXmlSerializable // Re-implement IXmlSerializable

    {

        const string idXml001 = "idXml001";

        public string Guid { get; set; } = string.Empty;

        public new void ReadXml(XmlReader reader)

        {

            reader.MoveToContent();

            // At this point the reader is positioned on the beginning of the container element for the dictionary, so we can get any custom attributes we wrote.

            Guid = reader.GetAttribute(idXml001);

            base.ReadXml(reader);

        }

        public new void WriteXml(XmlWriter writer)

        {

            // At this point the container element has been written but nothing else, so it's still possible to add some attributes.

            if (Guid != null)

                writer.WriteAttributeString(idXml001, Guid);

            base.WriteXml(writer);

        }

    }

​

    public class TestClass

    {

        public static void Test()

        {

            Console.WriteLine();

            Test("123");

            Console.WriteLine();

            Test(null);

            Console.WriteLine();

​

            var type = typeof(SerializableDictWithGuid<string, string>);

​

            Console.WriteLine("interfaces implemented by {0}", type);

            foreach (var i in type.GetInterfaces())

            {

                Console.WriteLine("  " + i);

            }

            var methods = type.GetMethods(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy | BindingFlags.Instance);

            foreach (var method in methods.Where(m => m.Name.Contains("xml", StringComparison.OrdinalIgnoreCase)))

            {

                Console.WriteLine($"method name={method}, method.IsVirtual={method.IsVirtual}, declaring type = {method.DeclaringType}");

            }

        }

        public static void Test(string guid)

        {

            var dictionary = new SerializableDictWithGuid<string, string>

            {

                Guid = guid,

                ["hello"] = "there",

                ["foo"] = "bar"

            };

            var xml = dictionary.GetXml();

            Console.WriteLine(xml);

            var dict2 = xml.LoadFromXml<SerializableDictWithGuid<string, string>>();

            Assert.AreEqual(dictionary.Guid, dict2.Guid);

            var xml2 = dict2.GetXml();

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

            Assert.AreEqual(dictionary.Count, dict2.Count);

            Assert.AreEqual(System.Text.Json.JsonSerializer.Serialize(dictionary), System.Text.Json.JsonSerializer.Serialize(dict2));

        }

    }

​

    public static partial class XmlSerializationExtensions

    {

        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 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();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

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

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​