using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Xml.Serialization;

using System.Xml;

using System.IO;

using System.Diagnostics;

using System.Collections.ObjectModel;

using System.Threading;

using System.ComponentModel;

using System.Xml.Linq;

using System.Reflection;

using System.Data;

using System.Xml.Schema;

using System.Text.RegularExpressions;

using System.Net;

using System.Xml.XPath;

using System.Globalization;

using System.ComponentModel.DataAnnotations;

using System.Collections;

​

    [XmlRoot("monster")]

    public class monster

    {

        public flags flags { get; set; }

    }

​

    public class flags

    {

        const string SummonableName = "summonable"; // In c# 6.0 use nameof(summonable)

        const string AttackableName = "attackable"; // See  https://msdn.microsoft.com/en-us/library/dn986596.aspx

​

        [XmlIgnore]

        public int summonable { get; set; }

​

        [XmlIgnore]

        public int attackable { get; set; }

​

        [Browsable(false), EditorBrowsable(EditorBrowsableState.Never), DebuggerBrowsable(DebuggerBrowsableState.Never)]

        [XmlElement("flag")]

        public Flag[] Flags

        {

            get

            {

                return new[]

                {

                    new Flag { Name = SummonableName, Value = XmlConvert.ToString(summonable) },

                    new Flag { Name = AttackableName, Value = XmlConvert.ToString(attackable) },

                };

            }

            set

            {

                if (value == null)

                    return;

                foreach (var attr in value)

                {

                    if (attr.Name == SummonableName)

                        summonable = XmlConvert.ToInt32(attr.Value);

                    else if (attr.Name == AttackableName)

                        attackable = XmlConvert.ToInt32(attr.Value);

                }

            }

        }

    }

​

    public class Flag

    {

        [XmlIgnore]

        public string Name { get; set; }

​

        [XmlIgnore]

        public string Value { get; set; }

​

        [XmlAnyAttribute]

        public XmlAttribute[] XmlAttributes

        {

            get

            {

                var attr = new XmlDocument().CreateAttribute(Name.ToString());

                attr.Value = Value;

                return new [] { attr };

            }

            set

            {

                if (value == null || value.Length == 0)

                {

                    Name = null;

                    Value = null;

                }

                else if (value.Length == 1)

                {

                    Name = value[0].Name;

                    Value = value[0].Value;

                }

                else

                {

                    throw new ArgumentException("Too many attributes");

                }

            }

        }

    }

​

    class TestClass

    {

        internal static void Test()

        {

            var monster = new monster

            {

                flags = new flags

                {

                    attackable = 1,  // Here I'm using non-default values to make sure serialization actually worked.

                    summonable = 32,

                }

            };

            var xml = monster.GetXml(true);

            Console.WriteLine("Serialized XML: ");

            Console.WriteLine(xml);

            var monster2 = xml.LoadFromXML<monster>();

            var xml2 = monster2.GetXml(true);

            Console.WriteLine("Deserialized and re-serialized XML: ");

            Console.WriteLine(xml2);

​

            if (!(monster.flags.summonable == monster2.flags.summonable && monster.flags.attackable == monster2.flags.attackable))

            {

                throw new InvalidOperationException("!(monster.flags.summonable == monster2.flags.summonable && monster.flags.attackable == monster2.flags.attackable)");

            }

            else

            {

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

            }

​

        }

    }

​

    public class Program

    {

        public static void Main()

        {

            TestClass.Test();

        }

    }

​

    public static class XmlSerializationHelper

    {

        public static T LoadFromXML<T>(this string xmlString)

        {

            using (StringReader reader = new StringReader(xmlString))

            {

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

            }

        }

​

        public static string GetXml<T>(this T obj, 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))

                    new XmlSerializer(obj.GetType()).Serialize(xmlWriter, obj, ns);

                return textWriter.ToString();

            }

        }

    }

​