async Task ExecuteLoadCategoriesCommand()
{
if (IsBusy)
{
return;
}
IsBusy = true;
try
{
Categories.Clear();
var categories = await DataStoreCategory.GetItemsAsync(true);
foreach (var category in categories)
{
Categories.Add(category);
}
}
catch (Exception ex)
{
Debug.WriteLine(ex);
}
finally
{
IsBusy = false;
}
}
public CategoriesViewModel()
{
Title = "КАТЕГОРИИ КНИГ";
Categories = new ObservableCollection <Category>();
LoadCategoriesCommand = new Command(async() => await ExecuteLoadCategoriesCommand());
MessagingCenter.Subscribe <NewCategoryPage, Category>(this, "AddItem", async(obj, category) =>
{
var newItem = category as Category;
Categories.Add(newItem);
await DataStoreCategory.AddItemAsync(newItem);
}
);
}