Cannot implicitly convert type System.Collections.Generic.List to System.Collections.Generic.IEnumerable

Question

Hi,

I am trying to consume a web service to display Pins on Syncfusion Maps but getting this error:

Error CS0266: Cannot implicitly convert type 'System.Collections.Generic.List<Skyye.MainPage.LiveFlights.Response>' to 'System.Collections.Generic.IEnumerable<Syncfusion.SfMaps.XForms.MapMarker>'. An explicit conversion exists (are you missing a cast?)

Here is my class:

class LiveFlights  
{  
    public class Agent  
    {  
    }  
  
    public class Client  
    {  
        public string ip { get; set; }  
        public Geo geo { get; set; }  
        public Connection connection { get; set; }  
        public Device device { get; set; }  
        public Agent agent { get; set; }  
        public Karma karma { get; set; }  
    }  
  
    public class Connection  
    {  
        public string type { get; set; }  
        public int isp_code { get; set; }  
        public string isp_name { get; set; }  
    }  
  
    public class Device  
    {  
    }  
  
    public class Geo  
    {  
        public string country_code { get; set; }  
        public string country { get; set; }  
        public string continent { get; set; }  
        public string city { get; set; }  
        public double lat { get; set; }  
        public double lng { get; set; }  
        public string timezone { get; set; }  
    }  
  
    public class Karma  
    {  
        public bool is_blocked { get; set; }  
        public bool is_crawler { get; set; }  
        public bool is_bot { get; set; }  
        public bool is_friend { get; set; }  
        public bool is_regular { get; set; }  
    }  
  
    public class Key  
    {  
        public int id { get; set; }  
        public string api_key { get; set; }  
        public string type { get; set; }  
        public DateTime expired { get; set; }  
        public DateTime registered { get; set; }  
        public int limits_by_hour { get; set; }  
        public int limits_by_minute { get; set; }  
        public int limits_by_month { get; set; }  
        public int limits_total { get; set; }  
    }  
  
    public class Params  
    {  
        public string lang { get; set; }  
    }  
  
    public class Request  
    {  
        public string lang { get; set; }  
        public string currency { get; set; }  
        public int time { get; set; }  
        public string id { get; set; }  
        public string server { get; set; }  
        public string host { get; set; }  
        public int pid { get; set; }  
        public Key key { get; set; }  
        public Params @params { get; set; }  
        public int version { get; set; }  
        public string method { get; set; }  
        public Client client { get; set; }  
    }  
  
    public class Response  
    {  
        public string hex { get; set; }  
        public string flag { get; set; }  
        public double lat { get; set; }  
        public double lng { get; set; }  
        public int alt { get; set; }  
        public int dir { get; set; }  
        public int speed { get; set; }  
        public double v_speed { get; set; }  
        public string flight_number { get; set; }  
        public string flight_icao { get; set; }  
        public string flight_iata { get; set; }  
        public string dep_icao { get; set; }  
        public string dep_iata { get; set; }  
        public string airline_icao { get; set; }  
        public string airline_iata { get; set; }  
        public int updated { get; set; }  
        public string status { get; set; }  
        public string reg_number { get; set; }  
        public string arr_icao { get; set; }  
        public string arr_iata { get; set; }  
        public string aircraft_icao { get; set; }  
  
        /*  
        public Position position  
        {  
            get  
            {  
                return new Position(lat, lng);  
            }  
        }  
        */  
    }  
  
    public class Root  
    {  
        public Request request { get; set; }  
        public List<Response> response { get; set; }  
        public string terms { get; set; }  
    }  
}  

and this is my C#:

var client = new HttpClient();  
  
client.BaseAddress = new Uri("https://airlabs.co/api/v9/flights");  
  
var content = new FormUrlEncodedContent(new[]  
{  
    new KeyValuePair<string, string>("api_key", "xxxxxx-xxxxx-xxxx-xxxxx-xxxxx"),  
});  
  
var response = await client.PostAsync("https://airlabs.co/api/v9/flights", content);  
  
if (response.IsSuccessStatusCode)  
{  
    var result = await response.Content.ReadAsStringAsync();  
  
    List<LiveFlights.Root> data = JsonSerializer.Deserialize<List<LiveFlights.Root>>(result);  
  
    MapContactLocationLayer.MarkerItemsSource = data[0].response;      
}  
else  
{  
    await App.Current.MainPage.DisplayAlert("Error", "Error", "Error");  
}  

Kindly help..

Thanks,
Jassim

Answer 1

Hello,​

Please change this line List<LiveFlights.Root> data = JsonSerializer.Deserialize<List<LiveFlights.Root>>(result); to Root data = JsonConvert.DeserializeObject<Root>(result);.

And I tested your flights.txt file, I found value of "api_key" is garbled, so I change value to "api_key": "test" for testing.

Best Regards,

Leon Lu

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