Cannot deserialize the current JSON object Cannot deserialize the current JSON object with group column - asp.net-core

Question

I am calling the API and trying to store the Jsonresult into a IEnumerable model class. The json result has group header column consolidated_weather.
when I run the program the following error is coming
JsonSerializationException: Cannot deserialize the current JSON object into type 'System.Collections.Generic.IEnumerable`.
How can I call the given json result into the IEnumerable model class after avoiding group header from json result.
I am using the following two model.
public class Weather
{
[Key]
public long id { get; set; }
public string weather_state_name { get; set; }
public string weather_state_abbr { get; set; }
public string wind_direction_compass { get; set; }
public DateTime created { get; set; }
public DateTime applicable_date { get; set; }
public decimal min_temp { get; set; }
public decimal max_temp { get; set; }
public decimal the_temp { get; set; }
public double wind_speed { get; set; }
public decimal wind_direction { get; set; }
public decimal air_pressure { get; set; }
public decimal Humidity { get; set; }
public string Visibllity { get; set; }
public decimal Predictability { get; set; }
}
public class WeatherList
{
public IEnumerable<Weather> consolidated_weather { get; set; }
}
public async Task<IEnumerable<Weather>> GetWeatherAsync(string woied)
{
var url = SD.APIBaseUrl + woied;
var request = new HttpRequestMessage(HttpMethod.Get, url);
var client = _clientFactory.CreateClient();
HttpResponseMessage response = await client.SendAsync(request);
IEnumerable<Weather> weather = new List<Weather>();
WeatherList weatherList = new WeatherList();
if (response.StatusCode == System.Net.HttpStatusCode.OK)
{
var jsonString = await response.Content.ReadAsStringAsync();
weatherList = JsonConvert.DeserializeObject<WeatherList>(jsonString);
return weatherList;
}
return null;
}
The API result is coming as
<!-- language: lang-html -->
{
"consolidated_weather": [
{
"id": 4577625064341504,
"weather_state_name": "Heavy Rain",
"weather_state_abbr": "hr",
"wind_direction_compass": "WSW",
"created": "2020-07-14T19:35:14.577740Z",
"applicable_date": "2020-07-14",
"min_temp": 11.11,
"max_temp": 15.05,
"the_temp": 14.32,
"wind_speed": 6.570953330777592,
"wind_direction": 254.13274105640758,
"air_pressure": 1016.5,
"humidity": 85,
"visibility": 7.654361031575599,
"predictability": 77
},
{
"id": 4896540210495488,
"weather_state_name": "Showers",
"weather_state_abbr": "s",
"wind_direction_compass": "WNW",
"created": "2020-07-14T19:35:17.569534Z",
"applicable_date": "2020-07-15",
"min_temp": 12.31,
"max_temp": 17.03,
"the_temp": 16.509999999999998,
"wind_speed": 7.600821124862802,
"wind_direction": 284.49357944800784,
"air_pressure": 1015.5,
"humidity": 82,
"visibility": 13.558008729022509,
"predictability": 73
},
]
"title": "Texas",
"location_type": "City",
"timezone": "US"
<!-- end snippet -->

Answer 1

From your json string, we can see that there is a list of weather object in object consolidated_weather.
So you need to parse json to WeatherList.
public class WeatherList {
public IEnumerable<Weather> consolidated_weather { get; set; }
}
[HttpPost("/weather")]
public async Task<IEnumerable<Weather>> GetWeatherAsync()
{
string jsonString = "{\"consolidated_weather\":[{\"id\":4577625064341504,\"weather_state_name\":\"Heavy Rain\",\"weather_state_abbr\":\"hr\",\"wind_direction_compass\":\"WSW\",\"created\":\"2020-07-14T19:35:14.577740Z\",\"applicable_date\":\"2020-07-14\",\"min_temp\":11.11,\"max_temp\":15.05,\"the_temp\":14.32,\"wind_speed\":6.570953330777592,\"wind_direction\":254.13274105640758,\"air_pressure\":1016.5,\"humidity\":85,\"visibility\":7.654361031575599,\"predictability\":77},{\"id\":4896540210495488,\"weather_state_name\":\"Showers\",\"weather_state_abbr\":\"s\",\"wind_direction_compass\":\"WNW\",\"created\":\"2020-07-14T19:35:17.569534Z\",\"applicable_date\":\"2020-07-15\",\"min_temp\":12.31,\"max_temp\":17.03,\"the_temp\":16.509999999999998,\"wind_speed\":7.600821124862802,\"wind_direction\":284.49357944800784,\"air_pressure\":1015.5,\"humidity\":82,\"visibility\":13.558008729022509,\"predictability\":73}]}";
IEnumerable<Weather> weather = new List<Weather>();
WeatherList weatherList = new WeatherList();
weatherList = JsonConvert.DeserializeObject<WeatherList>(jsonString);
return weatherList.consolidated_weather;
}
Test Result
UPDATE
public class WeatherList
{
public IEnumerable<Weather> consolidated_weather { get; set; }
public string title { get; set; }
public string location_type { get; set; }
public string timezone { get; set; }
}
There are two missings in your json string:
<!-- language: lang-html -->
{
"consolidated_weather": [
{
"id": 4577625064341504,
...
},
{
"id": 4896540210495488,
...
},
] <!-- missing , -->
"title": "Texas",
"location_type": "City",
"timezone": "US"
<!-- missing } -->
<!-- end snippet -->

Answer 2

Assuming that you cannot change the content of the Json, you can create a ConsolidatedWeather class that contains the List of Weathers
public class ConsolidatedWeather
{
public List<Weather> Consolidated_Weather { get; set; }
}
and in your deserialize part
return JsonConvert.DeserializeObject<ConsolidatedWeather>(jsonString).Consolidated_Weather;