async Task ExecuteLoadItemsCommand()
{
if (IsBusy)
{
return;
}
IsBusy = true;
try
{
Items.Clear();
ItemsGrouped.Clear();
var items = await DataStoreNew.GetItemsAsync <Invoice>();
foreach (var item in items)
{
Items.Add(item);
}
foreach (var group in items.GroupBy(x => x.SellerName))
{
ItemsGrouped.Add(group);
}
}
catch (Exception ex)
{
Debug.WriteLine(ex);
}
finally
{
IsBusy = false;
}
}
public InvoiceListViewModel()
{
Title = "Invoices";
Items = new ObservableCollection <Invoice>();
ItemsGrouped = new ObservableCollection <IGrouping <string, Invoice> >();
LoadItemsCommand = new Command(async() => await ExecuteLoadItemsCommand());
ReloadInvoicesFromServer = new Command(async() => await ExecuteReloadInvoicesFromServerCommand());
MessagingCenter.Subscribe <NewItemPage, Invoice>(this, "AddItem", async(obj, item) =>
{
var _item = item as Invoice;
Items.Add(_item);
await DataStoreNew.AddItemAsync(_item);
});
}