C#•14mo ago

❔ JSON serialization fails

After the serialization RiotChampionWrapper.Champions is null. The problem might be that each item has a different name. How can I fix it?

public class RiotChampionWrapper
{
    [JsonPropertyName("data")]
    private List<RiotChampion> Champions { get; set; }
}

public class RiotChampion
{
    [JsonPropertyName("id")]
    public string Id { get; set; }

    [JsonPropertyName("key")]
    public string Key { get; set; }

    [JsonPropertyName("name")]
    public string Name { get; set; }
}

public class RiotChampionWrapper
{
    [JsonPropertyName("data")]
    private List<RiotChampion> Champions { get; set; }
}

public class RiotChampion
{
    [JsonPropertyName("id")]
    public string Id { get; set; }

    [JsonPropertyName("key")]
    public string Key { get; set; }

    [JsonPropertyName("name")]
    public string Name { get; set; }
}

RiotChampionWrapper? items = JsonSerializer.Deserialize<RiotChampionWrapper>(data);

RiotChampionWrapper? items = JsonSerializer.Deserialize<RiotChampionWrapper>(data);

{
  "type": "champion",
  "format": "standAloneComplex",
  "version": "13.10.1",
  "data": {
    "Aatrox": {
      "id": "Aatrox",
      "key": "266",
      "name": "Aatrox"
    },
    "Ahri": {
      "id": "Ahri",
      "key": "103",
      "name": "Ahri"
    }
  }
}

{
  "type": "champion",
  "format": "standAloneComplex",
  "version": "13.10.1",
  "data": {
    "Aatrox": {
      "id": "Aatrox",
      "key": "266",
      "name": "Aatrox"
    },
    "Ahri": {
      "id": "Ahri",
      "key": "103",
      "name": "Ahri"
    }
  }
}

6 Replies

undisputed world champions•14mo ago

data in your json is not an array, but an object with properties Aatrox and Ahri it should be something like this if you want an array instead:

{
  "type": "champion",
  "format": "standAloneComplex",
  "version": "13.10.1",
  "data": [
    "Aatrox": {
      "id": "Aatrox",
      "key": "266",
      "name": "Aatrox"
    },
    "Ahri": {
      "id": "Ahri",
      "key": "103",
      "name": "Ahri"
    }
  ]
}

{
  "type": "champion",
  "format": "standAloneComplex",
  "version": "13.10.1",
  "data": [
    "Aatrox": {
      "id": "Aatrox",
      "key": "266",
      "name": "Aatrox"
    },
    "Ahri": {
      "id": "Ahri",
      "key": "103",
      "name": "Ahri"
    }
  ]
}

(with square brackets [])

Halfbax•14mo ago

Sadly I am unable to change the json.

undisputed world champions•14mo ago

or your class could have a property private Dictionary<string, RiotChampion> Champions { get; set; } instead

Halfbax•14mo ago

Thanks. That's works 🙂

TheRanger•14mo ago

shouldn't it be public tho?

Accord•14mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ JSON serialization fails