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/48659674/how-to-insert-a-node-in-a-large-document-using-xmlserializer

    [XmlRoot("Car", Namespace = "http://MyNamespace")]

    [XmlType("Car", Namespace = "http://MyNamespace")]

    public class Car

    {

        [XmlAttribute]

        public string make { get; set; }

    }

​

    class TestClass

    {

        public static void Test()

        {

            TestWriteMcve();

        }

​

        static string XmlContent = @"

    <RootNode xmlns=""http://MyNamespace"">

        <Cars>

        <Car make=""Volkswagen"" />

        <Car make=""Ford"" />

        <Car make=""Opel"" />

        </Cars>

    </RootNode>";

​

        static string XmlContent2 = @"

    <RootNode xmlns:ns=""http://MyNamespace"">

        <ns:Cars>

        <ns:Car make=""Volkswagen"" />

        <ns:Car make=""Ford"" />

        <ns:Car make=""Opel"" />

        </ns:Cars>

    </RootNode>";

​

        private static void TestWriteMcve()

        {

            // Check what happens when the http://MyNamespace namespace is the default namespace

            TestWriteMcve(XmlContent);

            Console.WriteLine();

            // Check what happens when the http://MyNamespace namespace is a named namespace

            TestWriteMcve(XmlContent2);

        }

​

​

        private static void TestWriteMcve(string content)

        {

            var doc = new XmlDocument();

            doc.LoadXml(content);

            var nsMgr = new XmlNamespaceManager(doc.NameTable);

            nsMgr.AddNamespace("myns", "http://MyNamespace");

​

            var newCar = new Car { make = "BMW" };

​

            var node = doc.DocumentElement.SelectSingleNode("myns:Cars/myns:Car[@make='Ford']", nsMgr);

​

            node = TestReplace(doc, node, newCar);

​

            // Check that null works

            node = TestReplace(doc, node, null);

​

            node = TestReplace(doc, node, newCar);

        }

​

        private static XmlNode TestReplace(XmlDocument doc, XmlNode node, Car newCar)

        {

            node = node.ReplaceWithSerializationOf(newCar);

            var parent = node.ParentNode;

​

            Console.WriteLine("Replacement: ");

            Console.WriteLine(node.OuterXml);

            Console.WriteLine("Entire document: ");

            Console.WriteLine(doc.GetOuterXml());

​

            return node;

        }

    }

​

    public static class XmlNodeExtensions

    {

        public static XmlNode ReplaceWithSerializationOf<T>(this XmlNode node, T replacement)

        {

            if (node == null)

                throw new ArgumentNullException();

            var parent = node.ParentNode;

            var serializer = new XmlSerializer(replacement == null ? typeof(T) : replacement.GetType());

​

            using (var writer = node.CreateNavigator().InsertAfter())

            {

                // WriteWhitespace needed to avoid error "WriteStartDocument cannot

                // be called on writers created with ConformanceLevel.Fragment."

                writer.WriteWhitespace("");

​

                // Set up an appropriate initial namespace.

                XmlSerializerNamespaces ns = new XmlSerializerNamespaces();

                ns.Add(node.GetNamespaceOfPrefix(node.NamespaceURI), node.NamespaceURI);

​

                // Serialize

                serializer.Serialize(writer, replacement, ns);

            }

​

            var nextNode = node.NextSibling;

            parent.RemoveChild(node);

            return nextNode;

        }

    }

​

    public static class XmlSerializationHelper

    {

        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;

            }

        }

    }

​