EasyBike.Models.ContractService.StartRefreshAsync C# (CSharp) Method

        private async void StartRefreshAsync()
        {
            await Task.Delay(3000).ConfigureAwait(false);
            while (true)
            {
                if (CrossConnectivity.Current.IsConnected)
                {
                    // DispatcherHelper.
                    // At this time, DispatcherHelper cannot be used in a portable class library. Laurent works on a solution.
                    // var mapCenter = _localisationService.GetCurrentMapCenter();
                    contracts.ToList().Where(c => !c.ImageAvailability).AsParallel().ForAll(async (c) =>
                    {
                        if (await c.RefreshAsync().ConfigureAwait(false))
                        {
                            ContractRefreshed?.Invoke(c, EventArgs.Empty);
                        }

                        //var station = c.Stations.FirstOrDefault();
                        //if(station != null)
                        //{
                        //    if(mapCenter != null)
                        //    {
                        //        var distance = MapHelper.CalcDistance(mapCenter.Latitude, mapCenter.Longitude, station.Latitude, station.Longitude);
                        //        if (distance > 100)
                        //        {
                        //            Debug.WriteLine("DISTANCE : " + distance + " ...");
                        //            return;
                        //        }
                        //        else
                        //        {
                        //            Debug.WriteLine("DISTANCE : " + distance + " Refresh!");
                        //            if (await c.RefreshAsync().ConfigureAwait(false))
                        //            {
                        //                ContractRefreshed?.Invoke(c, EventArgs.Empty);
                        //            }
                        //        }
                        //    }
                        //    else
                        //    {
                        //        if (await c.RefreshAsync().ConfigureAwait(false))
                        //        {
                        //            ContractRefreshed?.Invoke(c, EventArgs.Empty);
                        //        }
                        //    }
                        //}
                    });
                }
                await Task.Delay(timer).ConfigureAwait(false);
            }
        }