Add function to Convert function - windows-phone-7

Question

I am trying to use Convert function from IValueConverter, but I have to call another function in it. I will use his return value but I got that error telling me to return an object value in the converter, any idea how can I avoid this please.
public void Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
RestClient client = new RestClient();
client.BaseUrl = "http://";
RestRequest request = new RestRequest();
request.Method = Method.GET;
request.AddParameter("action", "REE");
request.AddParameter("atm_longitude", location.Longitude);
client.ExecuteAsync(request, ParseFeedCallBack_ListDistance);
}
public void ParseFeedCallBack_ListDistance(IRestResponse response)
{
if (response.StatusCode == HttpStatusCode.OK)
{
ParseXMLFeedDistance(response.Content);
}
}
private string ParseXMLFeedDistance(string feed)
{
.... return myvalueToBind;
}

Answer 1

A simple way to calculate the distance between two coordinates, in this case, assuming you have the coordinates of the device,
using System.Device.Location;
public class GeoCalculator
{
public static double Distance(double deviceLongitude, double deviceLatitude, double atmLongitude, double atmLatitude)
{
//Coordinates of ATM (or origin).
var atmCoordinates = new GeoCoordinate(atmLatitude, atmLongitude);
//Coordinates of Device (or destination).
var deviceCordinates = new GeoCoordinate(deviceLatitude, deviceLongitude);
//Distance in meters.
return atmCoordinates.GetDistanceTo(deviceCordinates);
}
}
Hence your converter can look like:
public class DistanceConverter : IValueConverter
{
/// <summary>
/// This is your device coordinate.
/// </summary>
private static GeoCoordinate devCoordinate = new GeoCoordinate(61.1631, -149.9721);
public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
{
var location = value as LocationModel;
if (location != null)
{
return GeoCalculator.Distance(devCoordinate.Longitude, devCoordinate.Latitude, location.Longitude, location.Latitude);
}
return 0;
}
public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
{
throw new NotImplementedException();
}
}
Keep in mind that I would personally not use a converter for this. I would simply expose a simple property in my model that does this calculation as it's a simple logic. If you happen to be a purist and don't like any logic in your model, looping through the list and setting a property on your model would work too.