How do I map a GraphQL response with a JSON array property in C#?

Question

Mapping C# Class to GraphQL Response.

Hi,

I am learning GraphQL and how to query/commuicate with a GraphQL endpoint. The json response looks like the following:

{
  "data": {
    "allFilms": {
      "films": [
        {
          "title": "A New Hope",
          "releaseDate": "1977-05-25"
        },
        {
          "title": "The Empire Strikes Back",
          "releaseDate": "1980-05-17"
        },
        {
          "title": "Return of the Jedi",
          "releaseDate": "1983-05-25"
        },
        {
          "title": "The Phantom Menace",
          "releaseDate": "1999-05-19"
        },
        {
          "title": "Attack of the Clones",
          "releaseDate": "2002-05-16"
        },
        {
          "title": "Revenge of the Sith",
          "releaseDate": "2005-05-19"
        }
      ]
    }
  }
}

I am having a difficult time trying to map my response object accordingly. This is what I have so far:

   public class GraphQLFilmResponse
{
    public allFilms allFilms { get; set; }
}

public class allFilms
{
    public films films { get; set; }
}

public class films
{
    public List<film> film { get; set; }
}

public class film
{
    public string title { get; set; }
    public DateTime? releaseDate { get; set; }
}

The error message is as follows: Message=Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'GraphQL.films' because the type requires a JSON object (e.g. {"name":"value"}) to deserialize correctly.

Any help or links (I am sure someone asked this question already) would be appreciated.

You don't have a class that represents "data".

Robert Harvey
– Robert Harvey

2023-05-23 19:14:05 +00:00
Commented May 23, 2023 at 19:14 — Robert Harvey
– Robert Harvey, Commented May 23, 2023 at 19:14

Aniekan jr · Accepted Answer · 2023-05-23 19:20:25Z

1

public class Data
{
    public AllFilms AllFilms { get; set; }
}

public class AllFilms
{
    public List<Film> Films { get; set; }
}

public class Film
{
    public string Title { get; set; } = string.Empty;
    public DateTime? ReleaseDate { get; set; }
}

Deserialize object:

option = new JsonSerialiazerOption(){ PropertyNameCaseInsensitivity = true};
var data = JsonSerializer.Deserialze<Data>(response, options);

answered May 23, 2023 at 19:20

Aniekan jr

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1 Comment

brdrok Over a year ago

Thank you Bane. I guess youtube videos only get me so far. =) Thank you again. Works great!!!!

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