Need help converting JSON to C# Objects

Question

I'm currently trying to convert a JSON string into C# objects and currently am experiencing trouble during my debugging. Below is a sample of the JSON along with my classes.

Classes

    public class Timeline_RootObject
    {
        public List<Timeline_Frame> frames { get; set; }
        public int frameInterval { get; set; }
    }

    public class Timeline_Frame
    {
        public Participants players { get; set; }
        public IList<Event> events { get; set; }
        public int timestamp { get; set; }
    }

    public class Participants
    {
        public Players player1{ get; set; }
        public Players player2 { get; set; }
    }

    public class Event_Position
    {
        public int x { get; set; }
        public int y { get; set; }
    }
    public class Player_Position
    {
        public int x { get; set; }
        public int y { get; set; }
    }

    public class Players
    {
        public int participantId { get; set; }
        public Player_Position position { get; set; }
        public int currentGold { get; set; }
    }

    public class Event
    {
        public string type { get; set; }
        public int timestamp { get; set; }
        public int participantId { get; set; }
        public int itemId { get; set; }
    }

Sample JSON

{"frames": [
{
  "participantFrames": {
    "player1": {
      "participantId": 1,
      "position": {
        "x": 561,
        "y": 581
      },
      "currentGold": 475
    },
    {
      "player2": {
        "participantId": 2,
        "position": {
          "x": 561,
          "y": 581
        },
        "currentGold": 475
      }
    },
    "events": [
      {
        "type": "ITEM_PURCHASED",
        "timestamp": 1829,
        "participantId": 1,
        "itemId": 1039
      }
    ],
    "timestamp": 0
  },
  {
    "participantFrames": {
      "player1": {
        "participantId": 1,
        "position": {
          "x": 800,
          "y": 681
        },
        "currentGold": 525
      },
      {
        "player2": {
          "participantId": 2,
          "position": {
            "x": 754,
            "y": 642
          },
          "currentGold": 525
        }
      },
      "events": [
        {
          "type": "ITEM_PURCHASED",
          "timestamp": 45358,
          "participantId": 1,
          "itemId": 684
        }
      ],
      "timestamp": 60000
    }

Currently I am able to access the Event's Type, Timestamp, ItemID and participant ID. But for some reason I can't access classes within a class for example the Event_Position or Players class is always null.

Code Generating Objects

    public List<Timeline_RootObject> json_timeline = new List<Timeline_RootObject>();
    json_timeline.Add(JsonConvert.DeserializeObject<Timeline_RootObject>(json));

If anybody could help guide me through this small roadblock, I'd greatly appreciate it!

Okay, and where's your code to generate the objects based on the content of the decoded JSON data? — Mike Robinson
– Mike Robinson, Commented Jun 15, 2015 at 12:50
Edited the original entry with the code generating the objects. — TaylorM
– TaylorM, Commented Jun 15, 2015 at 12:58

Glorfindel · Accepted Answer · 2015-06-15 13:11:16Z

1

This property:

public Participants players { get; set; }

doesn't correspond with the key participantFrames in the JSON string. You'll have to change the property name, or add the attribute [JsonProperty("participantFrames")] to it.

Also, the class Event_Position is not used at the moment, nor do I see any occurrence in the JSON.

answered Jun 15, 2015 at 13:11

Glorfindel

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1 Comment

TaylorM Over a year ago

I was adapting from my code to not overwhelm the post with un-needed info. Your suggestion of using the [JsonProperty(String)] was the thing I needed. It was such a simple fix, I feel embarassed for even asking from the beginning!

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