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;

// https://stackoverflow.com/questions/40791596/object-model-with-various-type-inside

​

    public abstract class RootBase

    {

        public Header header { get; set; }

​

        [XmlIgnore]

        // The following provides get-only access to the specific content of this root

        public abstract ContentBase BasicContent { get; }

    }

​

    public class Header

    {

        public string elementA { get; set; }

        public string elementB { get; set; }

    }

​

    [XmlRoot(ElementName = "root")]

    public class Root<TContent> : RootBase 

        where TContent : ContentBase

    {

        public TContent content { get; set; }

​

        public override ContentBase BasicContent { get { return content; } }

    }

​

    public abstract class ContentBase

    {

        public string elementC { get; set; }

    }

​

    public class ContentA : ContentBase

    {

        public VariousTypeA variousTypeA { get; set; }

    }

​

    public class ContentB : ContentBase

    {

        public VariousTypeB variousTypeB { get; set; }

    }

​

    public class VariousTypeA

    {

        public string itemA { get; set; }

        public string itemB { get; set; }

        public string itemC { get; set; }

    }

​

    public class VariousTypeB

    {

        public string itemZ { get; set; }

        public string itemY { get; set; }

        public string itemX { get; set; }

    }

​

    class TestClass

    {

        static string GetTypeAXml()

        {

            var xml = @"<root>

    <header>

        <elementA>Example</elementA>

        <elementB>Test</elementB>

    </header>

    <content>

        <elementC>foo</elementC>

        <variousTypeA>

            <itemA>Test</itemA>

            <itemB>Test</itemB>

            <itemC>Test</itemC>

        </variousTypeA>

    </content>

</root>";

            return xml;

        }

​

        static string GetTypeBXml()

        {

            var xml = @"<root>

    <header>

        <elementA>Example</elementA>

        <elementB>Test</elementB>

    </header>

    <content>

        <elementC>foo</elementC>

        <variousTypeB>

            <itemZ>Test</itemZ>

            <itemY>Test</itemY>

            <itemX>Test</itemX>

        </variousTypeB>

    </content>

</root>";

            return xml;

        }

​

        internal static void Test()

        {

            var xmlStringA = GetTypeAXml();

            var rootA = (Root<ContentA>)new XmlSerializer(typeof(Root<ContentA>)).Deserialize(new StringReader(xmlStringA));

​

            var newXmlA = rootA.GetXml(true);

            Console.WriteLine("Deserialized and re-serialized {0}", rootA.GetType());

            Console.WriteLine(newXmlA);

​

            var xmlStringB = GetTypeBXml();

            var rootB = (Root<ContentB>)new XmlSerializer(typeof(Root<ContentB>)).Deserialize(new StringReader(xmlStringB));

​

            var newXmlB = rootB.GetXml(true);

            Console.WriteLine("Deserialized and re-serialized {0}", rootB.GetType());

            Console.WriteLine(newXmlB);

        }

    }

​

    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();

            }

        }

    }

​