Cannot figure out why I'm getting this exception:

Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'ConsoleAppTest01.Location' because the type requires a JSON object

The JSON response can be viewed here (no worries I'll update the API key later): http://dataservice.accuweather.com/locations/v1/postalcodes/search?apikey=RUuBWKtaUKRJC4GtWkjGDuhStOZblr78&q=12065

Here's what my code looks like:

public class Location
{
    public Locality[] Property1 { get; set; }
}

public class Locality
{
    public int Version { get; set; }
    public string Key { get; set; }
    public string Type { get; set; }
    public int Rank { get; set; }
    public string LocalizedName { get; set; }
    public string EnglishName { get; set; }
    public string PrimaryPostalCode { get; set; }
    public Region Region { get; set; }
    public Country Country { get; set; }
    public Administrativearea AdministrativeArea { get; set; }
    public Timezone TimeZone { get; set; }
    public Geoposition GeoPosition { get; set; }
    public bool IsAlias { get; set; }
    public Parentcity ParentCity { get; set; }
    public Supplementaladminarea[] SupplementalAdminAreas { get; set; }
    public string[] DataSets { get; set; }
}

public class Region
{
    public string ID { get; set; }
    public string LocalizedName { get; set; }
    public string EnglishName { get; set; }
}

public class Country
{
    public string ID { get; set; }
    public string LocalizedName { get; set; }
    public string EnglishName { get; set; }
}

public class Administrativearea
{
    public string ID { get; set; }
    public string LocalizedName { get; set; }
    public string EnglishName { get; set; }
    public int Level { get; set; }
    public string LocalizedType { get; set; }
    public string EnglishType { get; set; }
    public string CountryID { get; set; }
}

public class Timezone
{
    public string Code { get; set; }
    public string Name { get; set; }
    public float GmtOffset { get; set; }
    public bool IsDaylightSaving { get; set; }
    public DateTime NextOffsetChange { get; set; }
}

public class Geoposition
{
    public float Latitude { get; set; }
    public float Longitude { get; set; }
    public Elevation Elevation { get; set; }
}

public class Elevation
{
    public Metric Metric { get; set; }
    public Imperial Imperial { get; set; }
}

public class Metric
{
    public float Value { get; set; }
    public string Unit { get; set; }
    public int UnitType { get; set; }
}

public class Imperial
{
    public float Value { get; set; }
    public string Unit { get; set; }
    public int UnitType { get; set; }
}

public class Parentcity
{
    public string Key { get; set; }
    public string LocalizedName { get; set; }
    public string EnglishName { get; set; }
}

public class Supplementaladminarea
{
    public int Level { get; set; }
    public string LocalizedName { get; set; }
    public string EnglishName { get; set; }
}

and in the Main()

static void Main(string[] args)
    {
        string apiUrl = $"http://dataservice.accuweather.com";
        
        Console.Write("Enter ZipCode: ");
        string zip = Console.ReadLine();

        string locationUri = $"{apiUrl}/locations/v1/postalcodes/search?apikey={APIKEY}&q={zip}";            

        Location locationData = GetLocation<Location>(locationUri);
                    
    }

and GetLocation() looks like:

   protected static T GetLocation<T>(string uri)
    {
        T result;

        HttpWebRequest request = WebRequest.Create(uri) as HttpWebRequest;
        request.Method = "GET";

        HttpWebResponse response = request.GetResponse() as HttpWebResponse;

        using (StreamReader reader = new StreamReader(response.GetResponseStream()))
        {
            string jsonString = reader.ReadToEnd();
            result = JsonConvert.DeserializeObject<T>(jsonString);
        }

        return result;
    }

CodePudding user response：

The Json returned from accuweather starts with a [ so it must be an array but you've told JsonConvert to deserialize an object Location; this is not an array (the json would have to start with a { for object deser to work)

A quick look (on a cellphone, hard to digest the full json and map it to your classes 100% on a small screen) seems like you want to deser a Locality[], not a Location..

..but I'd advise you to just paste your json into http://QuickType.io and use the classes it makes for you; they'll work off the bat

Or even better; it's quite likely accuweather publish a swagger/open api spec that you can run through something like AutoRest or nSwag and get those tools to generate a full set of client stubs for you so it's literally a single line of code to send an object to the api, get the response, read and deser it and give you the answer

CodePudding user response：

Your json root is List, not object. Try to use this

List<Locality> locationData = GetLocation<List<Locality>>(locationUri);