Question 241346 in Json Question posted in
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Newtonsoft JSON Trying to deserialize part of arrayed json to class

Below is the json in a very simplified form (the original contains many more items). I want to add the "acf" content of all items to List

[{
    "id": 26,
    "date": "2023-08-30T18:36:24",
    "date_gmt": "2023-08-30T18:36:24",  
    "acf": {
        "name": "John",
        "lastName": "Smith",
        "age": "33"     
    }
}, {
    "id": 20,
    "date": "2023-06-11T11:17:02",
    "date_gmt": "2023-06-11T11:17:02",
    "acf": {
        "name": "Randy",
        "lastName": "Jones ",
        "age": "22"     
    }
},
{
    "id": 20,
    "date": "2023-06-11T11:17:02",
    "date_gmt": "2023-06-11T11:17:02",
    "acf": {
        "name": "Mark",
        "lastName": "Taylor ",
        "age": "56" 
    }       
}]

    public class Acf
    {
        public string name { get; set; }
        public string lastName { get; set; }
        public string age { get; set; }
    }

Below is an example of how I tried to solve it. Surely there is a better and simpler way to solve this task. Thank you for your help.

  [System.Serializable]
  public class Acf
  {
        public string name { get; set; }
        public string lastName { get; set; }
        public string age { get; set; }
  }
 
  private List<Acf> _acfList = new List<Acf>();
 
 
 void PrepareAcfData(string json)
 {
 
 JArray data = JArray.Parse(json);
 
  for (int i = 0; i < data.Count; i++)
  {
    Acf newAcf = new Acf();
       
    newAcf.name = data[i]["acf"]["name"].Value<string>();
    newAcf.lastName = data[i]["acf"]["lastName"].Value<string>();
    newAcf.lastName = data[i]["acf"]["age"].Value<int>();
        
        _acfList.Add(newAcf);
  }
 }
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2

Answers


  1. 0

    You could combine JToken.SelectTokens() using a JSONPath wildcard expression with JToken.ToObject<T>() to simplify your code:

    var _acfList = root.SelectTokens("[*].acf").Select(t => t.ToObject<Acf>()).ToList();

    You could also use anonymous types to deserialize only selected parts of your JSON:

    var _acfList = JsonConvert.DeserializeAnonymousType(json, new [] { new { acf = default(Acf) }})
    .Select(a => a.acf)
    .ToList();

    Notes:

    • [*] is the JSONPath wildcard operator selecting all items in an array.

    • [*].acf] selects the value of the property "acf" in each array object.

    • ToObject<Acf>() converts each of those to your final model.

    • If your JSON were more complex, say with some outer container object {"root":[/* The array above*/ ]}, you could add that in as follows:

      root.SelectTokens("root[*].acf").Select(t => t.ToObject<Acf>()).ToList();

    • Deserializing directly to anonymous types may be more performant that parsing to an intermediate JToken hierarchy.

    Demo fiddle for SelectTokens here and for anonymous types here.

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  2. 0

    Just use Linq

        List<Acf> _acfList = JArray.Parse(json)
                               .Select(ja => ja["acf"].ToObject<Acf>())
                               .ToList();
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