using System;

using System.Collections.Generic;

using System.Text;

using System.Linq;

using System.Xml.Serialization;

using System.Xml;

using System.Xml.Linq;

using System.IO;

using System.Data;

using System.Runtime.Serialization;

using System.Runtime.Serialization.Formatters.Binary;

using System.IO.Compression;

​

    //https://stackoverflow.com/questions/51783203/xml-serialization-error-invalid-or-missing-value-of-the-choice-identifier-ite#51783203

​

    [System.CodeDom.Compiler.GeneratedCodeAttribute("System.Xml", "4.7.3130.0")]

    [System.SerializableAttribute()]

    [System.Diagnostics.DebuggerStepThroughAttribute()]

    [System.ComponentModel.DesignerCategoryAttribute("code")]

    [System.Xml.Serialization.XmlTypeAttribute(Namespace = "urn:openaccess")]

    public partial class MarketResultIdentifier : OpenAccessAbstractObject

    {

​

        private string[] itemsField;

​

        private ItemsChoiceType[] itemsElementNameField;

​

        private object itemField;

​

        private ItemChoiceType6 itemElementNameField;

​

        /// <remarks/>

        [System.Xml.Serialization.XmlElementAttribute("area", typeof(string))]

        [System.Xml.Serialization.XmlElementAttribute("areaNames", typeof(string))]

        [System.Xml.Serialization.XmlChoiceIdentifierAttribute("ItemsElementName")]

        public string[] Items

        {

            get

            {

                return this.itemsField;

            }

            set

            {

                this.itemsField = value;

            }

        }

​

        /// <remarks/>

        [System.Xml.Serialization.XmlElementAttribute("ItemsElementName")]

        [System.Xml.Serialization.XmlIgnoreAttribute()]

        public ItemsChoiceType[] ItemsElementName

        {

            get

            {

                return this.itemsElementNameField;

            }

            set

            {

                this.itemsElementNameField = value;

            }

        }

​

        /// <remarks/>

        [System.Xml.Serialization.XmlElementAttribute("applyingDate", typeof(System.DateTime), DataType = "date")]

        [System.Xml.Serialization.XmlElementAttribute("auctionIdentification", typeof(AuctionIdentification))]

        [System.Xml.Serialization.XmlElementAttribute("deliveryDay", typeof(System.DateTime), DataType = "date")]

        [System.Xml.Serialization.XmlChoiceIdentifierAttribute("ItemElementName")]

        public object Item

        {

            get

            {

                return this.itemField;

            }

            set

            {

                this.itemField = value;

            }

        }

​

        /// <remarks/>

        [System.Xml.Serialization.XmlIgnoreAttribute()]

        public ItemChoiceType6 ItemElementName

        {

            get

            {

                return this.itemElementNameField;

            }

            set

            {

                this.itemElementNameField = value;

            }

        }

    }

​

    /// <remarks/>

    [System.CodeDom.Compiler.GeneratedCodeAttribute("System.Xml", "4.7.3130.0")]

    [System.SerializableAttribute()]

    [System.Xml.Serialization.XmlTypeAttribute(Namespace = "urn:openaccess", IncludeInSchema = false)]

    public enum ItemsChoiceType

    {

​

        /// <remarks/>

        area,

​

        /// <remarks/>

        areaNames,

    }

​

    [System.CodeDom.Compiler.GeneratedCodeAttribute("System.Xml", "4.7.3130.0")]

    [System.SerializableAttribute()]

    [System.Xml.Serialization.XmlTypeAttribute(Namespace = "urn:openaccess", IncludeInSchema = false)]

    public enum ItemChoiceType6

    {

​

        /// <remarks/>

        applyingDate,

​

        /// <remarks/>

        auctionIdentification,

​

        /// <remarks/>

        deliveryDay,

    }

​

    // Dummy types not included in question

​

    public class AuctionIdentification

    {

    }

​

    public abstract class OpenAccessAbstractObject

    {

    }

​

    class TestClass

    {

        public static void Test()

        {

            var tradeAreas = new string[] {"Area1", "Area2", "Area3", "Area4"};

            var choices = Enumerable.Repeat(ItemsChoiceType.area, tradeAreas.Length).ToArray();

            MarketResultIdentifier mri = new MarketResultIdentifier

            {

                ItemsElementName = choices,

                Items = tradeAreas,

                ItemElementName = ItemChoiceType6.applyingDate,

                Item = DateTime.Today.AddDays(-1)

            };

​

​

            var ser = new XmlSerializer(typeof(MarketResultIdentifier));

            using (var stream = new MemoryStream())

            {

                ser.Serialize(stream, mri);

                stream.Position = 0;

                Console.WriteLine(new StreamReader(stream).ReadToEnd());

            }

        }

    }

​

    public static class XmlSerializationHelper

    {

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

        {

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

            using (var reader = new StringReader(xmlString))

            {

                return (T)serial.Deserialize(reader);

            }

        }

​

        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 static string GetOuterXml(this XmlNode node, bool indent = true)

        {

            if (node == null)

                return null;

            using (var textWriter = new StringWriter())

            {

                var settings = new XmlWriterSettings

                {

                    Indent = indent,

                    OmitXmlDeclaration = true,

                };

                using (var xmlWriter = XmlWriter.Create(textWriter, settings))

                {

                    node.WriteTo(xmlWriter);

                }

                return textWriter.ToString();

            }

        }

    }

    public static class XmlAssert

    {

        // https://weblogs.asp.net/marianor/easy-way-to-compare-two-xmls-for-equality

        // https://stackoverflow.com/questions/7318157/best-way-to-compare-xelement-objects

        // Adapted from the answer https://stackoverflow.com/a/14463137 by https://stackoverflow.com/users/1102100/robjohnson

        public static void AreEqual(

            XElement expected,

            XElement actual)

        {

            Assert.IsTrue(XNode.DeepEquals(Normalize(expected), Normalize(actual)));

        }

​

        private static XElement Normalize(XElement element)

        {

            if (element.HasElements)

            {

                return new XElement(

                    element.Name,

                    element.Attributes()

                           .OrderBy(a => a.Name.ToString()),

                    element.Elements()

                           .OrderBy(a => a.Name.ToString())

                           .Select(e => Normalize(e)));

​

            }

​

            if (element.IsEmpty)

            {

                return new XElement(

                    element.Name,

                    element.Attributes()

                           .OrderBy(a => a.Name.ToString()));

            }

​

            return new XElement(element.Name, element.Attributes()

                .OrderBy(a => a.Name.ToString()), element.Value);

        }

    }

    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 class Program

    {

        public static void Main()

        {

            Console.WriteLine("Roslyn 2.0 Compiler; Environment version: " + Environment.Version);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

                Console.WriteLine("Uncaught exception: ");

                Console.WriteLine(ex);

                throw;

            }

        }

    }

​