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/43505923/how-can-i-serialize-this-xml-array-to-a-property-in-my-class

​

    public class Opcion

    {

        public string codigoOpcion { get; set; }

        public string descripcionOpcion { get; set; }

    }

​

    [XmlRoot("auxiliarA")]

    [XmlType("auxiliarA")]

    public class CampoAuxiliar

    {

        private string descripcionAuxiliar;

        private DateTime fechaAuxiliar;

​

        public CampoAuxiliar() { }

​

        [XmlElement(ElementName = "descripcionAuxiliar", Type = typeof(string))]

        public string DescripcionAuxiliar

        {

            get { return descripcionAuxiliar; }

            set { descripcionAuxiliar = value; }

        }

​

        [XmlElement(ElementName = "fechaHabilitacion", Type = typeof(DateTime))]

        public DateTime FechaAuxiliar

        {

            get { return fechaAuxiliar; }

            set { fechaAuxiliar = value; }

        }

​

        private List<Opcion> opcion;

​

        [XmlElement("opcion")]

        public List<Opcion> Opcion

        {

            get { return opcion; }

            set { opcion = value; }

        }

    }

​

    class TestClass

    {

        public static void Test()

        {

            var root = new CampoAuxiliar

            {

                DescripcionAuxiliar = "Campo A",

                FechaAuxiliar = new DateTime(2017, 04, 19),

                Opcion = new List<Opcion>

                {

                    new Opcion { codigoOpcion = "01", descripcionOpcion = "1" },

                    new Opcion { codigoOpcion = "02", descripcionOpcion = "2" },

                    new Opcion { codigoOpcion = "03", descripcionOpcion = "3" },

                }

            };

            var xml = root.GetXml(true);

​

            Console.WriteLine(xml);

        }

    }

    public class Program

    {

        public static void Main()

        {

            TestClass.Test();

        }

    }

​

    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();

            }

        }

    }

​

​