JsonSerializationException: Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List - Asp.net

mustafasamet
August 11, 2022
59 views
0 votes
2 Answers

When I consume a Web API in the MVC project I encountered this error, but I cannot fix it. How can I solve this?

My API is clearly working but MVC implementation doesn’t work.

Controller

public async Task<IActionResult> ListCountries()
    {
        List<Country> countries = new List<Country>();
        HttpClient _client = new HttpClient();
        HttpResponseMessage _response = new HttpResponseMessage();
        _client = _apiHelper.Initial();
        _response = await _client.GetAsync("api/Countries/getall");
        if (_response.IsSuccessStatusCode)
        {
            var results = _response.Content.ReadAsStringAsync().Result;
            countries = JsonConvert.DeserializeObject<List<Country>>(results);
        }   

        return View(countries);
    }

JSON Data

"data": [
  {
      "id": 1,
      "countryName": "Afghanistan"
  },
  {
      "id": 2,
      "countryName": "Albania"
  },
  {
      "id": 3,
      "countryName": "Algeria"
 }
]

Answers

- jayrao
- August 11, 2022 at 1:30 pm
- 0 votes
0
If you built the Web Api change its response from
```
"data": [
{
  "id": 1,
  "countryName": "Afghanistan"
},
{
  "id": 2,
  "countryName": "Albania"
},
{
  "id": 3,
  "countryName": "Algeria"
}]
```
To
```
 [
        {
          "id": 1,
          "countryName": "Afghanistan"
        },
        {
          "id": 2,
          "countryName": "Albania"
        },
        {
          "id": 3,
          "countryName": "Algeria"
        }
]
```
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- AshishWadekar
- August 11, 2022 at 10:20 pm
- 0 votes
0
Create the object and cast it from json response to object
```
public class Data
    {
        public int id { get; set; }
        public string countryName { get; set; }
    }

    public class Root
    {
        public List<Data> data { get; set; }
    }
```
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