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;

using System.Runtime.InteropServices;

using System.Runtime.Serialization;

using System.Runtime.CompilerServices;

​

// https://stackoverflow.com/questions/7385921/how-to-write-a-comment-to-an-xml-file-when-using-the-xmlserializer

// https://stackoverflow.com/questions/46496054/can-you-create-a-property-and-serialize-it-as-a-comment

​

    // Note: nameof(Version) and nameof(Name) commented out since nameof() is not supported on dotNetFiddle

​

    public class Foo

    {

        [XmlAnyElement("VersionXmlComment")]

        public XmlComment VersionXmlComment { get { return GetType().GetXmlComment(); } set { } }

​

        [XmlComment("The application version, NOT the file version!")]

        public string Version { get; set; }

​

        [XmlAnyElement("NameXmlComment")]

        public XmlComment NameXmlComment { get { return GetType().GetXmlComment(); } set { } }

​

        [XmlComment("The application name, NOT the file name!")]

        public string Name { get; set; }

    }

​

    [AttributeUsage(AttributeTargets.Property, AllowMultiple = false)]

    public class XmlCommentAttribute : Attribute

    {

        public XmlCommentAttribute(string value)

        {

            this.Value = value;

        }

​

        public string Value { get; set; }

    }

​

    public static class XmlCommentExtensions

    {

        const string XmlCommentPropertyPostfix = "XmlComment";

        static XmlCommentAttribute GetXmlCommentAttribute(this Type type, string memberName)

        {

            var member = type.GetProperty(memberName);

            if (member == null)

                return null;

            var attr = member.GetCustomAttribute<XmlCommentAttribute>();

            return attr;

        }

        public static XmlComment GetXmlComment(this Type type, [CallerMemberName] string memberName = "")

        {

            var attr = GetXmlCommentAttribute(type, memberName);

            if (attr == null)

            {

                if (memberName.EndsWith(XmlCommentPropertyPostfix))

                    attr = GetXmlCommentAttribute(type, memberName.Substring(0, memberName.Length - XmlCommentPropertyPostfix.Length));

            }

            if (attr == null || string.IsNullOrEmpty(attr.Value))

                return null;

            return new XmlDocument().CreateComment(attr.Value);

        }

    }

​

    class TestClass

    {

        public static void Test()

        {

            Foo foo = new Foo { Version = "1.0", Name = "Bar" };

​

            var xml = foo.GetXml(true);

​

            Console.WriteLine("\nSerialized {0}", foo);

            Console.WriteLine(xml);

​

            var foo2 = xml.LoadFromXml<Foo>();

​

            var xml2 = foo2.GetXml(true);

​

            Console.WriteLine("\nDeserialized and re-serialized {0}", foo2);

            Console.WriteLine(xml2);

        }

    }

​

    public class AssertionFailedException : System.Exception

    {

        public AssertionFailedException() : base() { }

​

        public AssertionFailedException(string s) : base(s) { }

    }

​

    public static class Assert

    {

        public static void IsTrue(bool value)

        {

            IsTrue(value, "failed");

        }

​

        public static void IsTrue(bool value, string message)

        {

            if (value == false)

                throw new AssertionFailedException(message ?? "failed");

        }

    }

​

    public static class XmlSerializationHelper

    {

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

        {

            serial = serial ?? new XmlSerializer(typeof(T));

            T returnValue = default(T);

            using (StringReader reader = new StringReader(xmlString))

            {

                object result = serial.Deserialize(reader);

                if (result is T)

                {

                    returnValue = (T)result;

                }

            }

            return returnValue;

        }

​

        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: " + Environment.Version);

            Console.WriteLine();

​

            TestClass.Test();

        }

    }

​