using System;

using System.Collections;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.Serialization.Formatters;

using System.IO;

using System.Data;

using System.ComponentModel.DataAnnotations;

using System.Globalization;

using System.Reflection;

using System.Collections.ObjectModel;

​

using Newtonsoft.Json;

using Newtonsoft.Json.Linq;

using Newtonsoft.Json.Converters;

using Newtonsoft.Json.Serialization;    

using Newtonsoft.Json.Bson;

​

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

​

//https://stackoverflow.com/questions/16910369/bson-array-deserialization-with-json-net

​

    public static partial class BsonExtensions

    {

        public static T DeserializeFromFile<T>(string path, JsonSerializerSettings settings = null)

        {

            using (var stream = new FileStream(path, FileMode.Open))

                return Deserialize<T>(stream, settings);

        }

        public static T Deserialize<T>(byte [] data, JsonSerializerSettings settings = null)

        {

            using (var stream = new MemoryStream(data))

                return Deserialize<T>(stream, settings);

        }

​

        public static T Deserialize<T>(byte [] data, int index, int count, JsonSerializerSettings settings = null)

        {

            using (var stream = new MemoryStream(data, index, count))

                return Deserialize<T>(stream, settings);

        }

        public static T Deserialize<T>(Stream stream, JsonSerializerSettings settings = null)

        {

            // Use BsonReader in Json.NET 9 and earlier.

            using (var reader = new BsonDataReader(stream) { CloseInput = false })  // Let caller dispose the stream

            {

                var serializer = JsonSerializer.CreateDefault(settings);

                //https://www.newtonsoft.com/json/help/html/DeserializeFromBsonCollection.htm

                if (serializer.ContractResolver.ResolveContract(typeof(T)) is JsonArrayContract)

                    reader.ReadRootValueAsArray = true;

                return serializer.Deserialize<T>(reader);

            }

        }

    }

​

    class TestClass

    {

        public static void Test()

        {

            var array = new string [] { "A", "B" };

​

            // Serialization

            byte[] bytes;

            using (var ms = new MemoryStream())

            using (var bson = new BsonDataWriter(ms))

            {

                new JsonSerializer().Serialize(bson, array, typeof(string[]));

                bytes = ms.ToArray();

            }

​

            // Deserialization

            var newArray = BsonExtensions.Deserialize<string []>(bytes);

            Assert.IsTrue(newArray.SequenceEqual(array));

            var newDictionary = BsonExtensions.Deserialize<SortedDictionary<int, string>>(bytes);

            Assert.IsTrue(newDictionary.Values.SequenceEqual(array));

            Console.WriteLine("Round-trip successful.");

        }   

    }

​

    public class Program

    {

        public static void Main()

        {

            Console.WriteLine("Environment version: {0} ({1})", System.Runtime.InteropServices.RuntimeInformation.FrameworkDescription , GetNetCoreVersion());

            Console.WriteLine("Json.NET version: " + typeof(JsonSerializer).Assembly.FullName);

            Console.WriteLine();

​

            try

            {

                TestClass.Test();

            }

            catch (Exception ex)

            {

                Console.WriteLine("Failed with unhandled exception: ");

                Console.WriteLine(ex);

                throw;

            }

        }

        public static string GetNetCoreVersion()

        {

            //https://techblog.dorogin.com/how-to-detect-net-core-version-in-runtime-ecd65ad695be

            //

            var assembly = typeof(System.Runtime.GCSettings).GetTypeInfo().Assembly;

            var assemblyPath = assembly.CodeBase.Split(new[] { '/', '\\' }, StringSplitOptions.RemoveEmptyEntries);

            int netCoreAppIndex = Array.IndexOf(assemblyPath, "Microsoft.NETCore.App");

            if (netCoreAppIndex > 0 && netCoreAppIndex < assemblyPath.Length - 2)

                return assemblyPath[netCoreAppIndex + 1];

            return null;

        }

    }

​