GeoCoordinate System.FormatException

Question

I have a viewmodel which contains a System.Device.Location.GeoCoordinate property which is marked as [DataMember] like so:

[DataMember]
public GeoCoordinate Location
{
    get
    {
        return _location;
    }
    set
    {
        if (_location != value)
        {
            _location = value;
            NotifyPropertyChanged("Location");
        }
    }
}

I have a collection of a this viewmodel, and for every item of the collection I am getting:

A first chance exception of type 'System.FormatException' occurred in mscorlib.dll

The interesting part is that this only occurs when I am navigating back, but somewhere before OnNavigatedTo event fires.

Is this a known issue? how can I fix it?

Answer 1

Are you sure GeoCoordinate is serializable by the DataContractSerializer?

Try to build a custom GeoCoordinate type: write a simple class with two double latitude/longitude properties, a BuildFromGeoCoordinate() and a ToGeoCoordinate() method to convert from/to GeoCoordinate, and check if the error still happens.