async Task RefreshCommandExecute()
{
try
{
await Task.FromResult <object>(null);
if (IsBusy)
{
return;
}
IsBusy = true;
RefreshCommand.ChangeCanExecute();
Ceps.Clear();
foreach (var item in DatabaseService.Current.CepGetAll())
{
Ceps.Add(item);
}
}
catch (Exception ex)
{
throw;
}
}
public CepsViewModel() : base()
{
MessagingCenter.Subscribe <BuscaCepViewModel>(this, "ADICIONAR_CEP", (sender) =>
{
if (!Ceps.Any(lbda => lbda.Equals(sender.CEP)))
{
Ceps.Add(sender.CEP);
}
});
}
async Task RefreshCommandExecute()
{
try
{
if (IsBusy)
{
return;
}
IsBusy = true;
RefreshCommand.ChangeCanExecute();
Ceps.Clear();
// Recupera informações do banco de dados remoto API (Aula 4)
foreach (var item in await BuscaCepHttpClient.Current.GetCeps())
{
Ceps.Add(item);
}
// Recupera informações do banco de dados local (SQLite - Aula 3 parte 2)
//foreach (var item in DatabaseService.Current.CepGetAll())
//{
// Ceps.Add(item);
//}
}
catch (UnauthorizedAccessException ex)
{
if (await App.Current.MainPage.DisplayAlert("Ooops", ex.Message, "Sim", "Não"))
{
await BuscaCepHttpClient.Current.Autenticar(SEU_USUARIO, SUA_SENHA);
IsBusy = false;
RefreshCommand.ChangeCanExecute();
await RefreshCommandExecute();
}
}
catch (InvalidOperationException ex)
{
await App.Current.MainPage.DisplayAlert("Ooops", ex.Message, "Ok");
}
catch (Exception ex)
{
await App.Current.MainPage.DisplayAlert("Ah não!", ex.Message, "Ok");
}
finally
{
IsBusy = false;
RefreshCommand.ChangeCanExecute();
}
}
private async Task RefreshCommandExecute()
{
try
{
await Task.FromResult <object>(null);
RefreshCommand.ChangeCanExecute();
//LIMPAMOS A LISTA ANTES DE APRESENTAR AO NOSSO CLIENTE
Ceps.Clear();
//ADICIONA O NOVO CEP A LISTA QUE VAI PARA A VIEW
foreach (var item in DatabaseService.Current.GetAll())
{
Ceps.Add(item);
}
}
catch (Exception)
{
throw;
}
}
