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;

​

using NUnit.Framework; //NUnit.Framework.AssertionException

​

//https://stackoverflow.com/questions/57112361/xml-with-namespace-using-xmlwriter

​

    public class TestClass

    {

        public static void Test()

        {

            var sb = new StringBuilder();

            using (var textWriter = new StringWriter(sb))

            {

                // Namespace constants

                var ITRETURN = @"http://incometaxindiaefiling.gov.in/main";

                var ITR1FORM = @"http://incometaxindiaefiling.gov.in/ITR1";

                var ITRForm = @"http://incometaxindiaefiling.gov.in/master";

                var xsi = @"http://www.w3.org/2001/XMLSchema-instance";

​

                // Enable indenting and disable the XML declaration.

                var settings = new XmlWriterSettings

                {

                    Indent = true,

                    IndentChars = " ",

                    OmitXmlDeclaration  = true,

                };

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

                {

                    // Write the start element and all namespaces.

                    xmlWriter.WriteStartElement("ITRETURN", "ITR", ITRETURN);

                    xmlWriter.WriteAttributeString("xmlns","ITRETURN", null, ITRETURN);

                    xmlWriter.WriteAttributeString("xmlns","ITR1FORM", null, ITR1FORM);

                    xmlWriter.WriteAttributeString("xmlns","ITRForm", null, ITRForm);

                    xmlWriter.WriteAttributeString("xmlns","xsi", null, xsi);

​

                    // Write the ITR1 element

                    xmlWriter.WriteStartElement("ITR1", ITR1FORM);

​

                    // Write the CreationInfo

                    xmlWriter.WriteStartElement("CreationInfo", ITRForm);

​

                    xmlWriter.WriteElementString("SWVersionNo", ITRForm, "R1");             

                    xmlWriter.WriteElementString("SWCreatedBy", ITRForm, "SW92201920");             

                    xmlWriter.WriteElementString("XMLCreatedBy", ITRForm, "SW92201920");                

                    xmlWriter.WriteElementString("XMLCreationDate", ITRForm, "2019-07-19");             

                    xmlWriter.WriteElementString("IntermediaryCity", ITRForm, "Delhi");             

                    xmlWriter.WriteElementString("Digest", ITRForm, "lOa90+jndV+RYN0ghOemod4eomQDqsSm6tw3w8XWsZQ= ");               

​

                    xmlWriter.WriteEndElement(); // CreationInfo

​

                    xmlWriter.WriteEndElement(); // ITR1

​

                    xmlWriter.WriteEndElement(); // ITR

                }

            }

            var xml = sb.ToString();            

            Console.WriteLine(xml);

            Assert.IsTrue(XElement.DeepEquals(XElement.Parse(xml), XElement.Parse(GetRequiredXml())));

        }

        static string GetRequiredXml()

        {

            var xml = @"<ITRETURN:ITR xmlns:ITRETURN=""http://incometaxindiaefiling.gov.in/main"" xmlns:ITR1FORM=""http://incometaxindiaefiling.gov.in/ITR1"" xmlns:ITRForm=""http://incometaxindiaefiling.gov.in/master"" xmlns:xsi=""http://www.w3.org/2001/XMLSchema-instance"">

 <ITR1FORM:ITR1>

  <ITRForm:CreationInfo>

   <ITRForm:SWVersionNo>R1</ITRForm:SWVersionNo>

   <ITRForm:SWCreatedBy>SW92201920</ITRForm:SWCreatedBy>

   <ITRForm:XMLCreatedBy>SW92201920</ITRForm:XMLCreatedBy>

   <ITRForm:XMLCreationDate>2019-07-19</ITRForm:XMLCreationDate>

   <ITRForm:IntermediaryCity>Delhi</ITRForm:IntermediaryCity>

   <ITRForm:Digest>lOa90+jndV+RYN0ghOemod4eomQDqsSm6tw3w8XWsZQ= </ITRForm:Digest>

  </ITRForm:CreationInfo>

 </ITR1FORM:ITR1>

</ITRETURN:ITR>";

            return xml;

        }

    }

​

    static class StringExtensions

    {

        public static int IndexOfFirstDifference(this string a, string b)

        {

            int index = 0;

            int max = Math.Min(a.Length, b.Length);

            while (index < max && a[index] == b[index]) 

                index++;

            if (index >= a.Length || index >= b.Length)

                index = -1;

            return index;

        }

    }

​

    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 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;

            }

        }

    }

​