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;

​

namespace Question42114531.V3

{

    // https://stackoverflow.com/questions/42114531/populating-any-elements-on-a-web-service-in-c-sharp

​

    public class GenericRequestData_Type

    {

        private System.Xml.Linq.XElement[] anyField;

​

        [System.Xml.Serialization.XmlAnyElementAttribute()]

        public System.Xml.Linq.XElement[] Any

        {

            get

            {

                return this.anyField;

            }

            set

            {

                this.anyField = value;

            }

        }

    }

​

    class TestClass

    {

        internal static void Test()

        {

            // Taken from

            // https://msdn.microsoft.com/en-us/library/mt693096.aspx

​

            var contacts =

                new XElement("Contacts",

                    new XElement("Contact",

                        new XElement("Name", "Patrick Hines"),

                        new XElement("Phone", "206-555-0144"),

                        new XElement("Address",

                            new XElement("Street1", "123 Main St"),

                            new XElement("City", "Mercer Island"),

                            new XElement("State", "WA"),

                            new XElement("Postal", "68042")

                        )

                    )

                );

​

            var genericRequest = new GenericRequestData_Type();

            genericRequest.Any = new[] { contacts };

​

            Console.WriteLine(genericRequest.GetXml());

        }

    }

    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, 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()

    {

        Question42114531.V3.TestClass.Test();

    }

}