Cannot deserialize the current JSON object (e.g. {"name":"value"})

Question

This is my JSON data

{
    "logInResult": [
        {
            "Name": "yogesh singh",
            "cityName": "",
            "img": "DefaultImage/D_Vp_Men.png",
            "usrId": "374"
        }
    ]
}

and this is my code

public async Task<ActionResult> Index()
{

    HttpClient webClient1 = new HttpClient();
    Uri uri = new Uri("http://m.vinipost.com/service/userprofile.svc/[email protected]&pass=12345");

    HttpResponseMessage response1;

    response1 = await webClient1.GetAsync(uri);

    var jsonString = await response1.Content.ReadAsStringAsync();

    var _Data = JsonConvert.DeserializeObject<List<JClass>>(jsonString);
    foreach (JClass Student in _Data)
    {
        ViewBag.Message += Student.Name + ", ";
    }
    dynamic obj = JsonConvert.DeserializeObject(jsonString);
    ViewBag.Message += obj.data.Name;

    return View();
}

and the error is

Cannot deserialize the current JSON object (e.g. {"name":"value"}) into type 'System.Collections.Generic.List`1[MvcSumit1.Models.JClass]' 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) 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. Path 'logInResult', line 1, position 15.

Solution 1

You can't directly deserialize from your API response using JsonConvert.DeserializeObject.

Try this below code :

JObject jsonResponse = JObject.Parse(jsonString);
JObject objResponse = (JObject)jsonResponse["logInResult"];
Dictionary<string, JArray> _Data = Newtonsoft.Json.JsonConvert.DeserializeObject<Dictionary<string, JArray>>(objResponse.ToString());

Hope this will help you.

Solution 2

You should create the following classes in order to map your json data to actual classes.

    public class LogInResult
{
    public string Name { get; set; }
    public string cityName { get; set; }
    public string img { get; set; }
    public string usrId { get; set; }
}

public class RootObject
{
    public List<LogInResult> logInResult { get; set; }
}

You can then store the RootObject for further processing:

var result = JsonConvert.DeserializeObject<RootObject>(jsonString);

By using the getter for the list, you can get the list and iterate it as usual.

Solution 3

Your question seems to be a duplicate of: Using JsonConvert.DeserializeObject to deserialize Json to a C# POCO class

---

You are trying to deserialize your JSON object into an JSON array.

Store just the content of logInResult into jsonString, that is:

[{"Name":"yogesh singh","cityName":"","img":"DefaultImage\/D_Vp_Men.png","usrId":"374"}]

This of course assumes that you got your JClass correct in the first place.

Comments

[Admin]

hey one question, what is ["logInResult"] ? used as string?

[Krunal Mevada]

@NathielPaulino "logInResult" is nothing but json string JArray key. For more clarification please see "logInResult": [ in posted question. Hope you now clear.

[Lahib]

@KrunalMevada This helped me with my project. Thanks. This should def. be marked as the answer.