public async Task GeocodeAsync(double latitude, double longitude)
{
// Provide interim information
_geocodeResult = new GeocodeResult()
{
Latitude = latitude,
Longitude = longitude,
Name = String.Format("Lat: {0}, Lon: {1}", latitude, longitude)
};
SetQueryResultToGeocodeResult(QueryResult);
try
{
var geocodeProxy = CreateGeocodeProxy();
var result = await geocodeProxy.ReverseGeocode(latitude, longitude);
_geocodeResult = result;
SetQueryResultToGeocodeResult(QueryResult);
}
catch (Exception)
{
ErrorService.ShowLightDismissError("Ihr Ort konnte nicht erfolgreich erkannt werden");
}
}
//
// Copy/Paste Sample: http://open.mapquestapi.com/nominatim/v1/reverse?format=xml&lat=51.521435&lon=-0.162714
//
public async Task<GeocodeResult> ReverseGeocode(double latitude, double longitude)
{
string URL =
String.Format(
"http://open.mapquestapi.com/nominatim/v1/reverse?format=xml&lat={0}&lon={1}",
latitude.ToString(CultureInfo.InvariantCulture),
longitude.ToString(CultureInfo.InvariantCulture));
string response = "";
using (var client = new HttpClient())
{
response = await client.GetStringAsync(URL);
client.Dispose();
}
var searchresults = XElement.Parse(response);
var resElement = searchresults.Elements("result").FirstOrDefault();
var addressElement = searchresults.Elements("addressparts").FirstOrDefault();
if (resElement != null && addressElement != null)
{
var countryCode = (string)addressElement.Element("country_code");
if (0 == String.Compare("at", countryCode, StringComparison.OrdinalIgnoreCase))
{
// Only if City or Town is not available, we will fall back to the actual location name
string locationName = (string)addressElement.Element("city");
if (String.IsNullOrWhiteSpace(locationName))
{
locationName = (string)addressElement.Element("town");
if (String.IsNullOrWhiteSpace(locationName))
{
locationName = (string)resElement;
}
}
var result = new GeocodeResult()
{
Name = locationName,
Latitude = MappingHelpers.ConvertDouble((string) resElement.Attribute("lat")),
Longitude = MappingHelpers.ConvertDouble((string) resElement.Attribute("lon"))
};
return result;
}
}
return null;
}