using System;

using System.IO;

using System.Runtime.Serialization.Json;

using Newtonsoft.Json;

using System.Xml;

using System.Text;

public class Program

{

    private static class FetchTranslatedFileOutlineFactory

{

   const int BufferSize = 8192;

   private static Stream CreateTemporaryStream() => new MemoryStream();

​

   public static Payload CreateStreamedDocument( Stream inputStream ) =>

      FetchTranslatedFileOutlineFactory.PopulateStreamedDocument( new Payload(null, CreateTemporaryStream()), inputStream );

​

   public static Payload PopulateStreamedDocument( Payload fileOutline, Stream inputStream )

   {

      using( var reader = JsonReaderWriterFactory.CreateJsonReader( inputStream, XmlDictionaryReaderQuotas.Max ) )

      {

         while( !reader.EOF )

         {

            if( reader.NodeType == XmlNodeType.Element && reader.LocalName == nameof( fileOutline.data ) )

            {

               byte[] buffer = new byte[ BufferSize ];

               int readBytes = 0;

               while( ( readBytes = reader.ReadElementContentAsBase64( buffer, 0, buffer.Length ) ) > 0 )

                  fileOutline.dataStream.Write( buffer, 0, readBytes );

​

               // reader should now be positioned ON the EndElement

               //Debug.Assert( reader.NodeType == XmlNodeType.EndElement, "reader.NodeType == XmlNodeType.EndElement" );

               if( fileOutline.dataStream.CanSeek )

                  fileOutline.dataStream.Position = 0;

            }

            else

            {

               reader.Read();

            }

         }

      }

      return fileOutline;

   }

}

    private class Payload

    {

        public byte[] data {get; set; }

        public Stream dataStream { get; set; }

        public Payload( byte[] data, Stream dataStream )

        {

            this.data = data;

            this.dataStream = dataStream;

        }

    }

    public static void Main()

    {

        byte[] byteArray = new byte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };

        Payload payload = new Payload( byteArray, null );

        //payload.data = byteArray;

        string json = JsonConvert.SerializeObject(payload);

        Console.WriteLine(json);

        Payload p = FetchTranslatedFileOutlineFactory.CreateStreamedDocument(new MemoryStream( Encoding.UTF8.GetBytes( json ) ) );

        String newjs = @"{'data':'AQIDBAUGBwgJCg=='}";

        Payload deserializedByteArray = JsonConvert.DeserializeObject<Payload>(newjs);

        MemoryStream mem = new MemoryStream();

        p.dataStream.CopyTo(mem);

        if( deserializedByteArray.dataStream == null )

            Console.WriteLine("NULL");

        Console.Write(deserializedByteArray.dataStream);

        foreach( byte b in deserializedByteArray.data )

        {

            Console.WriteLine("---" + b);

        }

    }

}