using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Xml.Serialization;

using System.Xml;

using System.IO;

​

    // https://stackoverflow.com/questions/41235191/c-sharp-desalinizing-xml-xmltext-gets-null-instead-of-string-itself

​

    public class SnellMessage

    {

    }

​

    [XmlType("Instance_Updated"), Serializable]

    public class InstanceUpdated : SnellMessage

    {

        public InstanceUpdated()

        {

            InstanceFields = new List<Field>()

            {

                new Field() { Name = "INSTANCE_LABEL" },

                new Field() { Name = "MAT_ID" },

                new Field() { Name = "DEVICE_ID" }

            };

​

            ItemFields = new List<Field>()

            {

                new Field() { Name = "MATERIAL_ID" },

                new Field() { Name = "TITLE" },

                new Field() { Name = "ON_AIR_DURATION" }

            };

        }

​

        [XmlArray("Instance")]

        [XmlArrayItem("Field")]

        public List<Field> InstanceFields { get; set; }

​

        [XmlArray("Item")]

        [XmlArrayItem("Field")]

        public List<Field> ItemFields { get; set; }

    }

​

    [XmlType("Field"), Serializable]

    public class Field

    {

        [XmlAttribute("Name")]

        public string Name { get; set; }

​

        [XmlText]

        public string Value { get; set; }

    }

​

    class TestClass

    {

        static string GetXml()

        {

            var xml = @"<Instance_Updated>

  <Instance>

    <Field Name=""INSTANCE_LABEL"">00010541</Field>

    <Field Name=""MAT_ID"">TEST</Field>

    <Field Name=""DEVICE_ID"">TEST</Field>

  </Instance>

  <Item>

    <Field Name=""MATERIAL_ID"">TEST</Field>

    <Field Name=""TITLE"">TEST</Field>

    <Field Name=""ON_AIR_DURATION"">A</Field>

  </Item>

</Instance_Updated>";

            return xml;

        }

​

        internal static void Test()

        {

            var xml = GetXml();

​

            var instanceUpdated = xml.LoadFromXml<InstanceUpdated>();

​

            var xml2 = instanceUpdated.GetXml(true);

​

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

            Console.WriteLine(xml2);

        }

    }

​

    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();

            }

        }

    }

​