using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Runtime.Serialization;

using System.Diagnostics;

using System.Reflection;

using System.Runtime.Serialization.Formatters.Binary;

using System.IO;

using System.Collections;

using System.Collections.ObjectModel;

using System.ComponentModel;

using System.Threading;

​

​

    // https://stackoverflow.com/questions/42794732/customized-serialization

​

    public class Sprite

    {

        static int nextId = 0;

​

        public Sprite()

        {

            this.runtimeId = Interlocked.Increment(ref nextId);

        }

​

        [NonSerialized]

        readonly int runtimeId;

​

        public int RuntimeId { get { return runtimeId; } }

​

        public override string ToString()

        {

            return GetType().Name + ": " + RuntimeId.ToString();

        }

​

        public bool IsRegistered

        {

            get

            {

                foreach (var sprite in SpriteSurrogate.Sprites)

                {

                    if (object.ReferenceEquals(this, sprite))

                        return true;

                }

                return false;

            }

        }

    }

​

    [Serializable]

    class Displayable

    {

        public string name;

        public Sprite icon;

    }

​

    class TestClass

    {

        public static void Test()

        {

            SpriteSurrogate.AddSprite("1", new Sprite());

            SpriteSurrogate.AddSprite("2", new Sprite());

            SpriteSurrogate.AddSprite("3", new Sprite());

            SpriteSurrogate.AddSprite("4", new Sprite());

​

            var root = SpriteSurrogate.Sprites.Select((s, i) => new Displayable { icon = s, name = "hello " + i.ToString() }).Concat(new [] { new Displayable { name = "empty" } }).ToList();

​

            var selector = new SurrogateSelector();

            var spriteSurrogate = new SpriteSurrogate();

            spriteSurrogate.Register(selector);

​

            BinaryFormatter binaryFormatter = new BinaryFormatter(selector, new StreamingContext());

​

            var root2 = Copy(root, binaryFormatter);

​

            Assert.IsTrue(root.Select(d => d.icon).SequenceEqual(root2.Select(d => d.icon)));

            Console.WriteLine("{0} deserialized successfully. ", root2);

            Console.WriteLine("Result: ");

            Console.WriteLine(Newtonsoft.Json.JsonConvert.SerializeObject(root, Newtonsoft.Json.Formatting.Indented));

        }

​

        public static T Copy<T>(T original, BinaryFormatter binaryFormatter)

        {

            using (MemoryStream memoryStream = new MemoryStream())

            {

                binaryFormatter.Serialize(memoryStream, original);

                memoryStream.Seek(0, SeekOrigin.Begin);

                return (T)binaryFormatter.Deserialize(memoryStream);

            }

        }

    }

​

    public class AssertionFailedException : System.Exception

    {

        public AssertionFailedException() : base() { }

​

        public AssertionFailedException(string s) : base(s) { }

    }

​

    public static class Assert

    {

        public static void IsTrue(bool value)

        {

            if (value == false)

                throw new AssertionFailedException("failed");

        }

    }

​

    class ObjectReferenceProxy<T> : IObjectReference

    {

        public T RealObject { get; set; }

​

        #region IObjectReference Members

​

        object IObjectReference.GetRealObject(StreamingContext context)

        {

            return RealObject;

        }

​

        #endregion

    }

​

    public sealed class SpriteSurrogate : ObjectLookupSurrogate<string, Sprite>

    {

        static Dictionary<string, Sprite> sprites = new Dictionary<string, Sprite>();

        static Dictionary<Sprite, string> spriteNames = new Dictionary<Sprite, string>();

​

        public static void AddSprite(string name, Sprite sprite)

        {

            if (name == null || sprite == null)

                throw new ArgumentNullException();

            sprites.Add(name, sprite);

            spriteNames.Add(sprite, name);

        }

​

        public static IEnumerable<Sprite> Sprites

        {

            get

            {

                return sprites.Values;

            }

        }

​

        protected override string GetId(Sprite realObject)

        {

            if (realObject == null)

                return null;

            return spriteNames[realObject];

        }

​

        protected override Sprite GetRealObject(string id)

        {

            if (id == null)

                return null;

            return sprites[id];

        }

    }

​

    public abstract class ObjectLookupSurrogate<TId, TRealObject> : ISerializationSurrogate where TRealObject : class

    {

        public void Register(SurrogateSelector selector)

        {

            foreach (var type in Types)

                selector.AddSurrogate(type, new StreamingContext(StreamingContextStates.All), this);

        }

​

        IEnumerable<Type> Types

        {

            get

            {

                yield return typeof(TRealObject);

                yield return typeof(ObjectReferenceProxy<TRealObject>);

            }

        }

​

        protected abstract TId GetId(TRealObject realObject);

​

        protected abstract TRealObject GetRealObject(TId id);

​

        #region ISerializationSurrogate Members

​

        public void GetObjectData(object obj, SerializationInfo info, StreamingContext context)

        {

            var original = (TRealObject)obj;

            var id = GetId(original);

            info.AddValue("id", id);

            // use Info.SetType() to force the serializer to construct an object of type ObjectReferenceWrapper<TRealObject> during deserialization.

            info.SetType(typeof(ObjectReferenceProxy<TRealObject>));

        }

​

        public object SetObjectData(object obj, SerializationInfo info, StreamingContext context, ISurrogateSelector selector)

        {

            // Having constructed an object of type ObjectReferenceWrapper<TRealObject>, 

            // look up the real sprite using the id in the serialization stream.

            var wrapper = (ObjectReferenceProxy<TRealObject>)obj;

            var id = (TId)info.GetValue("id", typeof(TId));

            wrapper.RealObject = GetRealObject(id);

            return wrapper;

        }

​

        #endregion

    }

​

    public class Program

    {

        public static void Main()

        {

            TestClass.Test();

        }

    }

​