using System;

using fastJSON;

​

public class Vector2

{

    public float posX;

    public float posY;

    public Vector2() 

    { }

    public Vector2(float x, float y)

    {

        this.posX = x;

        this.posY = y;

    }

}

​

public class Sprite

{

    public Vector2 Position { get; init; }

    public Sprite() { }

}

​

public static class Vector2Ext

{

    public static Vector2 ToVector2(this string str)

    {

        var coords = str.Replace("{", "").Replace("}", "").Trim().Split(" ", 2);

​

        float.TryParse(coords[0].Split(":")[1], out float x);

        float.TryParse(coords[1].Split(":")[1], out float y);

​

        return new Vector2(x, y);

    }

    public static string ToJSON(this object obj)

    {

        Vector2 vec = (Vector2)obj;

        return $"{{ x:{vec.posX} y:{vec.posY} }}";

    }

}

​

public class Program

{

    public static void Main()

    {

        Sprite sprite = new Sprite { Position = new Vector2(20, 10) };

        /*JSON.RegisterCustomType(typeof(Vector2),

                                (x) => { return x.ToJSON(); },

                                (x) => { return Vector2Ext.ToVector2(x); });*/

        string json = JSON.ToJSON(sprite);

        Console.WriteLine(json);

        var vec = JSON.ToObject<Sprite>(json);

        Console.WriteLine($"X: {vec.Position.posX} Y: {vec.Position.posY}");

    }

​

}