public async Task <String> calcPosition(String tagAddress, GeoCoordinate presentCoordinate, Boolean isConnected)
{
String addressName = tagAddress;
CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
try
{
if (!isConnected)
{
dBFacade.createLocalStorageNFCs(presentCoordinate.Latitude, presentCoordinate.Longitude, tagAddress);
return(tagAddress);
}
cancellationTokenSource.CancelAfter(10000);
if (!cancellationTokenSource.IsCancellationRequested)
{
Address address = await dBFacade.getAddress(tagAddress);
Debug.WriteLine("Address: " + address);
if (address == null)
{
return(null);
}
addressName = address.AddressName;
GeoCoordinate targetCoordinate = new GeoCoordinate(address.Latitude, address.Longtitude);
await getDistance(presentCoordinate, targetCoordinate, addressName);
}
else
{
await getDistance(presentCoordinate, presentCoordinate, tagAddress);
}
}
catch (OperationCanceledException ex)
{
Debug.WriteLine("cancellation token");
Debug.WriteLine(ex.StackTrace);
}
return(addressName);
}