CODEWITHSUNDEEP
c#asp.netjson.net
Baneforce
Baneforce

Reputation: 39

Deserialize object error error when reading a list

I have the next response from an API

{
  "ArticleSpecification": [
    {
      "Name": "SomeName",
      "Description ": "Description ",
      "Label": "SomeLabel",
    }
  ]
}

Then I try to Deserialize the object using my class

public class ArticleSpecification
    {
        [JsonProperty("Description")]
        public string Description { get; set; }
        [JsonProperty("Label")]
        public string Label { get; set; }
        [JsonProperty("Name")]
        public string Name { get; set; }
    }

The deserialize section looks like this

    if (responseMessage.IsSuccessStatusCode)
            {
                var json = responseMessage.Content.ReadAsStringAsync().Result;

List<ArticleSpecification>  articles = JsonConvert.DeserializeObject<List<ArticleSpecification>(json);
            }

The result is the next :

Unhandled exception. Newtonsoft.Json.JsonSerializationException: Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[Program+ArticleSpecification]' because the type requires a JSON array (e.g. [1,2,3]) to deserialize correctly.
To fix this error either change the JSON to a JSON array (e.g. [1,2,3]) or change the deserialized type so that it is a normal .NET type (e.g. not a primitive type like integer, not a collection type like an array or List<T>) that can be deserialized from a JSON object. JsonObjectAttribute can also be added to the type to force it to deserialize from a JSON object

Upvotes: 0

Views: 257

Answers (1)

Piotr Szuflicki
Piotr Szuflicki

Reputation: 84

The response from API is an object, not the array.

Your response actually is an object, which has the property: ArticleSpecification which is the array. Example of class for such reponse:

class APIResponse {
    public ArticleSpecification[] ArticleSpecification { get; set; }
}

Then you can deserialize response:

var response = JsonConvert.DeserializeObject<APIResponse>(json);
List<ArticleSpecification> articles = new List<ArticleSpecification>(response.ArticleSpecification);

Something among those lines.

Upvotes: 3

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