windows-phone-7 – 是否可以检查位置服务是否有效？

GeoCoordinateWatcher g = new GeoCoordinateWatcher();
            g.Start();
            if (g.Permission.Equals(GeoPositionPermission.Granted))
            {
                //Your location services is enabled. Go ahead.
                //Your codes goes here.
            }
            else if (g.Permission.Equals(GeoPositionPermission.Denied) || g.Permission.Equals(GeoPositionPermission.Unknown))
            {                    
                MessageBox.Show("Location services are disabled. To enable them,Goto Settings - Location - Enable Location Services.","Location services",MessageBoxButton.OK);
            }