Cannot deserialize the current JSON object (e.g. {\"Name\":\"value\"}) into type

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I am trying to fetch Data from API with Key.

I am trying to fetch in Windows Forms application.

I am able to fetch the data but when I try to display that data in datagridview, it shows an error message like:

Cannot deserialize the current JSON object (e.g., <code>{\"name\":\"value\"}</code>) into type because the type requires a JSON array (e.g. <code>[1,2,3]</code>) to deserialize correctly.

When I check value of the body variable, I get data like this:

"{\"movie_results\":[{\"title\":\"Hum Tum and Them\",\"year\":2019,\"imdb_id\":\"tt10045256\"},
{\"title\":\"Hum Tum Aur Ghost\",\"year\":2010,\"imdb_id\":\"tt1465493\"},
{\"title\":\"Hum Tum Aur Woh\",\"year\":1971,\"imdb_id\":\"tt0378073\"},
{\"title\":\"Hum Tum Dushman Dushman\",\"year\":2015,\"imdb_id\":\"tt6002986\"},
{\"title\":\"Hum Tum Pe Marte Hain\",\"year\":1999,\"imdb_id\":\"tt0226786\"},
{\"title\":\"Hum Tum Shabana\",\"year\":2011,\"imdb_id\":\"tt2034011\"},
{\"title\":\"Hum Tum\",\"year\":2004,\"imdb_id\":\"tt0378072\"},
{\"title\":\"Hum Tum\",\"year\":2014,\"imdb_id\":\"tt10039022\"},
{\"title\":\"Hum Tumhare Hain Sanam\",\"year\":2002,\"imdb_id\":\"tt0222024\"}],
\"search_results\":9,\"status\":\"OK\",\"status_message\":\"Query was successful\"}"

So now, I want to display this data in datagrid view.
I have also tried this:

JavaScript

var result2 = JsonConvert.DeserializeObject<List<MovieNew>>(body);

but get Cannot deserialize error.

What I have tried:

C#

public class MovieNew
{
	public string title { get; set; }
	public int year { get; set; }
    public string imdb_id { get; set; }
}

public async void Test_Api_With_Autentication()
{
String s = "https://movies-tv-shows-database.p.rapidapi.com/?title";
   
string movieName = System.Web.HttpUtility.UrlPathEncode(txtMovieName.Text);
s = s + "=" + movieName;

string finalMovieName = s;

var client = new HttpClient();

var request = new HttpRequestMessage
{
	Method = HttpMethod.Get,
    RequestUri = new Uri(finalMovieName),
    Headers =
    {
			{ "Type", "get-movies-by-title" },
			{ "X-RapidAPI-Key", "My API KEY" },
			{ "X-RapidAPI-Host", "movies-tv-shows-database.p.rapidapi.com" },
	},
};

using (var response = await client.SendAsync(request))
{
    var body = await response.Content.ReadAsStringAsync();
}
}

Posted 26-Sep-23 19:33pm

Devendra Sarang

Updated 2-Oct-23 3:40am

Deeksha Shenoy

v2

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OriginalGriff · Answer 1 · 2023-09-26T22:06:00

Your MovieNew class does not match the JSON.
If I convert the "display" string to a genuine JSON string:

JSON

{"movie_results":[{"title":"Hum Tum and Them","year":2019,"imdb_id":"tt10045256"},
{"title":"Hum Tum Aur Ghost","year":2010,"imdb_id":"tt1465493"},
{"title":"Hum Tum Aur Woh","year":1971,"imdb_id":"tt0378073"},
{"title":"Hum Tum Dushman Dushman","year":2015,"imdb_id":"tt6002986"},
{"title":"Hum Tum Pe Marte Hain","year":1999,"imdb_id":"tt0226786"},
{"title":"Hum Tum Shabana","year":2011,"imdb_id":"tt2034011"},
{"title":"Hum Tum","year":2004,"imdb_id":"tt0378072"},
{"title":"Hum Tum","year":2014,"imdb_id":"tt10039022"},
{"title":"Hum Tumhare Hain Sanam","year":2002,"imdb_id":"tt0222024"}],
"search_results":9,"status":"OK","status_message":"Query was successful"}

And run it through a Json to C# converter[^] I get these classes:

C#

// Root myDeserializedClass = JsonConvert.DeserializeObject<Root>(myJsonResponse);
    public class MovieResult
    {
        public string title { get; set; }
        public int year { get; set; }
        public string imdb_id { get; set; }
    }

    public class Root
    {
        public List<MovieResult> movie_results { get; set; }
        public int search_results { get; set; }
        public string status { get; set; }
        public string status_message { get; set; }
    }

Which is nothing like your single class:

C#

public class MovieNew
{
	public string title { get; set; }
	public int year { get; set; }
     public string imdb_id { get; set; }
}
...
var result2 = JsonConvert.DeserializeObject<List<MovieNew>>(body);

If the Json doesn't match the classes, you will rightly get an error...

George Swan · Answer 2 · 2023-09-26T22:09:00

You need to have suitable classes to deserialize the Json into. Something along these lines.

C#

public class Movie
 {
     public string? Title { get; set; }
     public int Year  { get; set; }
     public string? Imdb_Id { get; set; }

 }
 public class MoviesSummary
 {
     public Movie[]?Movie_Results { get; set; }
     public int Search_Results { get; set; }
     public string? Status { get; set; }

     public string? Status_Message { get; set; }
 }

Then you should be good to go like this

C#

    class Program
    {
        static void Main(string[] args)
        {
            string jsonString = $$"""
{"movie_results":[{"title":"Hum Tum and Them","year":2019,"imdb_id":"tt10045256"},
{ "title":"Hum Tum Aur Ghost","year":2010,"imdb_id":"tt1465493"},
{ "title":"Hum Tum Aur Woh","year":1971,"imdb_id":"tt0378073"},
{ "title":"Hum Tum Dushman Dushman","year":2015,"imdb_id":"tt6002986"},
{ "title":"Hum Tum Pe Marte Hain","year":1999,"imdb_id":"tt0226786"},
{ "title":"Hum Tum Shabana","year":2011,"imdb_id":"tt2034011"},
{ "title":"Hum Tum","year":2004,"imdb_id":"tt0378072"},
{ "title":"Hum Tum","year":2014,"imdb_id":"tt10039022"},
{ "title":"Hum Tumhare Hain Sanam","year":2002,"imdb_id":"tt0222024"}],
"search_results":9,"status":"OK","status_message":"Query was successful"
}
""";
          var moviesSummary = JsonSerializer.Deserialize<MoviesSummary>(jsonString,
                               new JsonSerializerOptions{PropertyNameCaseInsensitive=true});

            Console.ReadLine();
      }
   }

Graeme_Grant · Answer 3 · 2023-09-26T22:32:00

To expand on what others have said, there are tools out there that can help you generate the classes from the JSON for you. My go to is: JSON Utils: Generate C#, VB.Net, SQL TAble and Java from JSON[^]

Here is a sample of classes generated:

C#

public class MovieResult
{

    [JsonProperty("title")]
    public string Title { get; set; }

    [JsonProperty("year")]
    public int Year { get; set; }

    [JsonProperty("imdb_id")]
    public string ImdbId { get; set; }
}

public class Movies
{

    [JsonProperty("movie_results")]
    public IList<MovieResult> MovieResults { get; set; }

    [JsonProperty("search_results")]
    public int SearchResults { get; set; }

    [JsonProperty("status")]
    public string Status { get; set; }

    [JsonProperty("status_message")]
    public string StatusMessage { get; set; }
}

Cannot deserialize the current JSON object (e.g. {\"Name\":\"value\"}) into type

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