Hi everybody, I know it has been answered probably a thousand times but still I can't find any answer that fits exactly my problem. I'm a beginner in c sharp and I'm really stuck in this. I'm trying to develop a basic weather forecast app and I use this
code to retrieve info about the current GPS location.
class GetCurrentLocation: INotifyPropertyChanged
{
Geolocator locator = new Geolocator();
private double longtitude;
public double Longtitude
{
get { return longtitude; }
}
private double latitude;
public double Latitude
{
get { return latitude; }
}
public LocationInfo CurrentLocationInfo;
Task tempTask;
Task tempTask2;
public event PropertyChangedEventHandler PropertyChanged;
protected void OnPropertyChanged(string name)
{
PropertyChangedEventHandler handler = PropertyChanged;
if (handler!=null)
{
handler(this, new PropertyChangedEventArgs(name));
}
}
public GetCurrentLocation() //constructor
{
tempTask = GetCurrentCoordinates();
tempTask2 = SearchLocationByCoordinates(this.longtitude, this.latitude);
}
public async Task GetCurrentCoordinates()
{
try
{
Geoposition position = await locator.GetGeopositionAsync();
longtitude = position.Coordinate.Point.Position.Longitude;
latitude = position.Coordinate.Point.Position.Latitude;
await SearchLocationByCoordinates(longtitude, latitude);
}
catch (UnauthorizedAccessException)
{
ShowMessage("Location service has to to be enabled to get current position");
}
}
private async void ShowMessage(string message)
{
MessageDialog dialog = new MessageDialog(message);
await dialog.ShowAsync();
}
private async Task<Response> GetResponse(Uri uri)
{
System.Net.Http.HttpClient client = new System.Net.Http.HttpClient();
var response = await client.GetAsync(uri);
using (var stream=await response.Content.ReadAsStreamAsync())
{
DataContractJsonSerializer ser = new DataContractJsonSerializer(typeof(Response));
return ser.ReadObject(stream) as Response;
}
}
public async Task SearchLocationByCoordinates(double longtitude, double latitude)
{
if (longtitude !=0 && latitude!=0)
{
string coordinates = latitude.ToString() + "," + longtitude.ToString();
Uri geocodeRequest = new Uri(string.Format("http://dev.virtualearth.net/REST/v1/Locations/{0}?&incl=ciso2&key=1Bing key));
Response r = await GetResponse(geocodeRequest);
if (r != null &&
r.ResourceSets != null &&
r.ResourceSets.Length > 0 &&
r.ResourceSets[0].Resources != null &&
r.ResourceSets[0].Resources.Length > 0)
{
foreach (BingMapsRESTService.Common.JSON.Location l
in r.ResourceSets[0].Resources)
{
CurrentLocationInfo = new LocationInfo();
CurrentLocationInfo.Longtitude = l.Point.Coordinates[0];
CurrentLocationInfo.Latitude = l.Point.Coordinates[1];
CurrentLocationInfo.Name = l.Name;
CurrentLocationInfo.Locality = l.Address.Locality;
CurrentLocationInfo.CountryIso2 = l.Address.CountryRegionIso2;
}
} //Breakpoint here
}
}
The methods are called from inside another class like this
class LocationManager
{
List<LocationInfo> LocationList = new List<LocationInfo>();
GetCurrentLocation getCurrentLocation = new GetCurrentLocation();
LocationInfo currentLocationInfo = new LocationInfo();
Task tempTask;
Task tempTask2;
public LocationManager() //Constractor
{
tempTask = getCurrentLocation.GetCurrentCoordinates();
tempTask2 = getCurrentLocation.SearchLocationByCoordinates(getCurrentLocation.Longtitude, getCurrentLocation.Latitude);
currentLocationInfo = getCurrentLocation.CurrentLocationInfo;
}
but in the last line the currentLocationInfo and getCurrentLocation.CurrentLocationInfo return null. When I set a breakpoint at the end of the SearchLocationByCoordinates method I can see that I get results but not when I don't use one. I know that it has to
do something with the way I call the methods but due to luck of knowledge I don't know how to solve this. Can anyone help? Thanks in advance.
