using System;

using System.Collections.Generic;

using System.Text;

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/48427634/how-to-use-xmlserializer-to-serialize-derived-instances

​

    public static class XmlNamespaces

    {

        public const string OpengisWfs = "http://www.opengis.net/wfs";

    }

​

    [XmlRoot(Namespace = XmlNamespaces.OpengisWfs)]

    public class Query

    {

        public Filter Filter { get; set; }

    }

​

    [XmlInclude(typeof(PropertyIsOpFilter))]

    [XmlInclude(typeof(OpFilterBase))]

    [XmlRoot(Namespace = XmlNamespaces.OpengisWfs)]

    public class Filter

    {

        [XmlElement]

        public Filter And { get; set; }

    }

​

    [XmlInclude(typeof(PropertyIsEqualToFilter))]

    [XmlRoot(Namespace = XmlNamespaces.OpengisWfs)]

    public class PropertyIsOpFilter : Filter

    {

        public Filter LeftOp { get; set; }

​

        public Filter RightOp { get; set; }

    }

​

    [XmlRoot("IsEqualTo", Namespace = XmlNamespaces.OpengisWfs)]

    public class PropertyIsEqualToFilter : PropertyIsOpFilter { }

​

    [XmlInclude(typeof(LiteralFilter))]

    [XmlRoot(Namespace = XmlNamespaces.OpengisWfs)]

    public class OpFilterBase : Filter

    {

        public string Op { get; set; }

        public object Value { get; set; }

    }

​

    [XmlRoot(Namespace = XmlNamespaces.OpengisWfs)]

    public class LiteralFilter : OpFilterBase { }

​

    class TestClass

    {

        public static string ToXml(Object o)

        {

            var inputSerializer = new XmlSerializer(o.GetType());

            using (var writer = new Utf8StringWriter())

            {

                using (var xmlWriter = XmlWriter.Create(writer, new XmlWriterSettings { Indent = true }))

                {

                    inputSerializer.Serialize(xmlWriter, o);

                }

                return writer.ToString();

            }

        }

​

        public static void Test()

        {

            Filter o = new PropertyIsEqualToFilter()

            {

                LeftOp = new LiteralFilter()

                {

                    Value = 1

                },

                RightOp = new LiteralFilter()

                {

                    Value = 1

                }

            };

​

            var query = new Query()

            {

                Filter = o

            };

​

            var xml = ToXml(query);

​

            Console.WriteLine(xml);

​

            var query2 = xml.LoadFromXml<Query>();

​

            var xml2 = ToXml(query2);

​

            Assert.IsTrue(XNode.DeepEquals(XElement.Parse(xml), XElement.Parse(xml2)));

​

            Assert.IsTrue(query.Filter.GetType() == query2.Filter.GetType());

​

            Console.WriteLine("\nTests Passed.");

        }

    }

​

    public class Utf8StringWriter : System.IO.StringWriter

    {

        public override Encoding Encoding { get { return Encoding.UTF8; } }

    }

​

    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 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;

            }

        }

    }

​