使用DataContractJsonSerializer从反序列化的JSON文件中的“对象”中有什么？

Question

我在文档或相关问题中找不到任何内容。

我正在尝试反序列化以下json文件（ tile_config.json ）：

{
  "tile_info": [
    {
      "height": 32,
      "width": 32
    }
  ],
  "tiles-new": [
    {
      "file": "tiles.png",
      "tiles": [
        {
          "id": "t_dirt",
          "fg": [
            { "weight":500, "sprite":640},
            { "weight":1, "sprite":3620},
            { "weight":1, "sprite":3621},
            { "weight":1, "sprite":3622}
            ],
          "rotates": false
        },
        {
            "id": "t_fence_rope",
            "fg": 2016,
            "bg": 640
        }
      ]
    }
  ]
}

键“fg”可以是整数或对象数组，如示例中所示。

我尝试使用以下代码进行反序列化：

using System;
using System.Collections.Generic;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Json;

namespace JSONTest
{
    class Program
    {
        static void Main(string[] args)
        {
            load_json();
        }


        public static void load_json()
        {
            var ser = new DataContractJsonSerializer(typeof(TileConfig));
            System.IO.FileStream file =
                new System.IO.FileStream(".\\tile_config.json", System.IO.FileMode.Open);
            var tileconfig = (TileConfig)ser.ReadObject(file);
            file.Close();


            var Tile0 = tileconfig.tiles_new[0].tiles[0];
            Console.WriteLine(Tile0.id);
            //Output: t_dirt
            Console.WriteLine(Tile0.fg);
            //Output: System.Object[]
            Console.WriteLine(((Object[])Tile0.fg)[0]);
            //Output: System.Object

            //This doesn't work => InvalidCastException
            // var try1 = (JSON_Loader.TileConfig.TileValues.TileIndex)((Object[])tileconfig.tiles_new[0].tiles[0].fg)[0];

            //This doesn't work either => InvalidCastException
            //var try2 = ((Dictionary<object,object>)tileconfig.tiles_new[0].tiles[0].fg);
            //var try3 = ((Dictionary<string, object>)tileconfig.tiles_new[0].tiles[0].fg);

            //For the second one this works
            var Tile1 = tileconfig.tiles_new[0].tiles[1];
            Console.WriteLine(Tile1.id);
            //Output: t_fence_rope
            Console.WriteLine(Tile1.fg);
            //Output: 2016
            var try4 = ((int)Tile1.fg);
            Console.WriteLine(try4);
            //Output: 2016

            Console.ReadLine();
        }
    }

    [DataContract]
    public class TileConfig
    {
        [DataMember(Order = 0)]
        public List<TileInfo> tile_info;
        [DataMember(Name = "tiles-new", Order = 1)]
        public List<TileValues> tiles_new;

        [DataContract]
        public class TileInfo
        {
            [DataMember(EmitDefaultValue = false, Order = 0)]
            public int height;
            [DataMember(EmitDefaultValue = false, Order = 1)]
            public int width;
        }

        [DataContract]
        public class TileValues
        {
            [DataMember(EmitDefaultValue = false, Order = 0)]
            public string file;
            [DataMember(EmitDefaultValue = false, Order = 5)]
            public Tile[] tiles;

            [DataContract]
            public class Tile
            {
                [DataMember(EmitDefaultValue = false, Order = 0)]
                public string id;
                [DataMember(EmitDefaultValue = false, Order = 1)]
                public Object fg;
                [DataMember(EmitDefaultValue = false, Order = 2)]
                public int bg;
                [DataMember(EmitDefaultValue = false, Order = 3)]
                bool rotates;
            }

            [DataContract]
            public class TileIndex
            {
                [DataMember(EmitDefaultValue = false, Order = 0)]
                public int weight;
                [DataMember(EmitDefaultValue = false, Order = 1)]
                public int[] sprite;
            }
        }
    }
}

正如您所看到的，我试图通过将fg声明为Object来解决问题。这部分起作用。该文件反序列化没问题。但我无法获得“fg”的数据（我还没发现）。我尝试将它转换为字典，将其转换为TileIndex（因为我会猜到它是什么）并且我试图将其转换为字符串，但这不起作用或者我不知道如何使其工作在这种情况下。

现在我猜测fg被设置为某个东西，因为它不是null而ToString正在返回System.Object。我的问题是DataContractJsonSerializer在这个对象中使用和存储的类型是什么？