将可观察的集合绑定到GridView

Question

<GridView  SelectionMode="None" x:Name="InvoiceContainer" CanReorderItems="True" 
 ItemTemplate="{StaticResource ItemTemplate2}" ItemsSource="{Binding SecondCollection}"
/>

I'm Using windows Store apps. I have used an observable collection to bind data to the grid view. I need to bind all items in reverse order.

ex item 3, item 2, item 1 instead of item 1, item 2, item 3

Answer 1

You will need to sort the collection before binding. You can use LINQ to create a newly ordered collection. Assuming your data items have a "Name" element you want to sort on you can do the following:

data = new ObservableCollection<DataItem>(data.[OrderByDescending][1](d => d.Name));

It's not built-in, but there are extended versions of CollectionViewSource which support sorting. I can't vouch for any specifically, but a quick search for CollectionViewSource Sort WinRT found several that look promising.