Parsing Dynamic Json datastructure to object C# / dotnet core

Question

I am trying to parse data from Riot API to C# objects https://developer.riotgames.com/api-methods/#lol-static-data-v1.2/GET_getChampionList

        HttpClient client = new HttpClient();
        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
        HttpResponseMessage response = await client.GetAsync("https://global.api.riotgames.com/api/lol/static-data/EUW/v1.2/champion?champData=allytips%2Cenemytips%2Cimage%2Ctags&dataById=true&api_key=###################");

        if (response.IsSuccessStatusCode)
        {
            var streamTask = response.Content.ReadAsStreamAsync();
            var stringJson = await response.Content.ReadAsStringAsync();
            var serializer = new DataContractJsonSerializer(typeof(ChampionWrapper));
            var champions = serializer.ReadObject(await streamTask) as ChampionWrapper;
        }

So far I am only getting the type and version converted.
The Data structure looks as following:

{
  "type": "champion",
  "version": "7.9.1",
  "data": {
    "89": {
      "id": 89,
      "key": "Leona",
      "name": "Leona",
      "title": "the Radiant Dawn",
      "image": {
        "full": "Leona.png",
        "sprite": "champion2.png",
        "group": "champion",
        "x": 0,
        "y": 0,
        "w": 48,
        "h": 48
      },
      "allytips": [
        "Lead the charge and mark your foes with Sunlight before your allies deal damage.",
        "Shield of Daybreak and Zenith Blade form a powerful offensive combo.",
        "You can absorb a huge amount of damage using Eclipse, but you must stay near enemies to gain the bonus duration."
      ],
      "enemytips": [
        "When Leona activates Eclipse, you have three seconds to get away from her before she deals damage.",
        "Only foes in the center of Solar Flare get stunned, so you can often avoid this if you're quick."
      ],
      "tags": [
        "Tank",
        "Support"
      ]
    },
    "110": {
      "id": 110,
      "key": "Varus",
      "name": "Varus",
      "title": "the Arrow of Retribution",
      "image": {
        "full": "Varus.png",
        "sprite": "champion3.png",
        "group": "champion",
        "x": 336,
        "y": 96,
        "w": 48,
        "h": 48
      },

So far I have a ChampionWrapper:

public class ChampionWrapper
{
    public string type { get; set; }
    public string version { get; set; }
    public List<ChampionData> data { get; set; }

    public ChampionWrapper()
    {

    }
}

List ChampionData is not getting populated. Version and type is working.

    public List<string> id {get;set;}
    public List<Champion> id { get; set; }
    public ChampionData()
    {

    }

Here is the champion object

    public string Id { get; set; }
    public string Name { get; set; }
    public string Title { get; set; }
    public List<string> AllyTips { get; set; }
    public List<string> EnemyTips { get; set; }
    public List<string> Tags { get; set; }

    public Champion()
    {

    }

My main problem is the dynamic datastruce

"data": {
    "89": { .... }
    "110": { .... }

The number is just the ID of the champion.

Kiksen · Accepted Answer · 2017-05-07 11:01:14Z

Found solution:

            DataContractJsonSerializerSettings settings = new DataContractJsonSerializerSettings();
            settings.UseSimpleDictionaryFormat = true;

The whole thing:

        HttpClient client = new HttpClient();
        client.DefaultRequestHeaders.Accept.Clear();
        client.DefaultRequestHeaders.Accept.Add(new MediaTypeWithQualityHeaderValue("application/json"));
        HttpResponseMessage response = await client.GetAsync("https://global.api.riotgames.com/api/lol/static-data/EUW/v1.2/champion?champData=allytips%2Cenemytips%2Cimage%2Ctags&dataById=true&api_key=###########");

        if (response.IsSuccessStatusCode)
        {
            DataContractJsonSerializerSettings settings = new DataContractJsonSerializerSettings();
            settings.UseSimpleDictionaryFormat = true;

            var streamTask = response.Content.ReadAsStreamAsync();
            var stringJson = await response.Content.ReadAsStringAsync();
            var serializer = new DataContractJsonSerializer(typeof(ChampionWrapper), settings);
            var champions = serializer.ReadObject(await streamTask) as ChampionWrapper;
        }

And ofcourse changing list to Dictionary:

public class ChampionWrapper
{
    public string type { get; set; }
    public string version { get; set; }
    public Dictionary<string, Champion> data { get; set; }
}

Federico Dipuma · Accepted Answer · 2017-05-07 20:23:11Z

1

You are not using the correct class for deserializing your object. The data property in your json is not a List, but more like a Dictionary:

public class ChampionWrapper
{
    public string type { get; set; }
    public string version { get; set; }
    public Dictionary<string, Champion> data { get; set; }
}

[Edit]

I believe that you are complicating the way to deserialize the response from Json, instead of deserializing the response manually using DataContractSerializer you should use ReadAsAsync<T> extension method to obtain an object of your class:

if(response.IsSuccessStatusCode)
{
    var champions = await response.Content.ReadAsAsync<ChampionWrapper>();
}

This extension method is found inside the Microsoft.AspNet.WebApi.Client nuget package, remember to add it before using it.

edited May 7, 2017 at 20:23

answered May 7, 2017 at 10:46

Federico Dipuma

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3 Comments

Kiksen Over a year ago

Hi. It's still not working even when changed to Dictionary<string, Champion>

Federico Dipuma Over a year ago

@Kiksen updated the answer including a better way to deserialize your responses

Kiksen Over a year ago

-> I had found this. Problem is I am using DotNetCore, which does not supporte ReadAsAsync.

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