public override async Task UpdateBusinessesListExecute()
{
await base.UpdateBusinessesListExecute();
var tempBusiness = new List <Business>(BusinessesList.Where(b => b.IsFeatured));
BusinessesList.Clear();
foreach (Business business in tempBusiness)
{
BusinessesList.Add(business);
}
}
private async Task UpdateBusinessesListExecute()
{
if (IsBusy)
{
return;
}
IsBusy = true;
try
{
// tentar ir buscar à cache primeiro
SemaphoreSlim semaphore = (Application.Current as App).semaphore;
await semaphore.WaitAsync();
if (((App)Application.Current).CachedBusinesses == null)
{
Debug.WriteLine("Getting from db");
// Get Businesses and set to cache, otherwise use cached
var businesses = await Task.Run(GetBusinesses);
((App)Application.Current).CachedBusinesses = new List <Business>(businesses);
}
else
{
Debug.WriteLine("Using cached");
}
semaphore.Release();
var status = await CrossPermissions.Current.CheckPermissionStatusAsync(Permission.Location);
if (status == PermissionStatus.Granted)
{
Location userLocation = await((App)Application.Current).GetLocationAsync();
if (((App)Application.Current).LocationEnabled)
{
foreach (Business business in ((App)Application.Current).CachedBusinesses)
{
business.Distance =
Location.CalculateDistance(business.Location, userLocation, DistanceUnits.Kilometers);
}
DisplayLocationError = false;
}
}
else
{
DisplayLocationError = true;
}
// Needs to be in main, UI thread
await Device.InvokeOnMainThreadAsync(() =>
{
BusinessesList.Clear();
foreach (Business business in (Application.Current as App).CachedBusinesses)
{
BusinessesList.Add(business);
}
});
}
catch (Exception exception)
{
Debug.WriteLine(exception);
}
finally
{
IsBusy = false;
}
}