Not showing items with Visibility=Collapsed in Windows 8.1 GridView

Question

I have a Windows 8.1 application with a GridView bound to a custom (sortable, deduplicated) observable collection. In this collection, I do some heavy filtering

Answer 1

It takes me a lot of time to understand the problem, and the solution right in front of my eyes. You trying to hide the item itself but the container still there, When you add an item to an GridView, the item is wrapped in an item container. from msdn :

" When you add an item to an ItemsControl, the item is wrapped in an item container. For example, an item added to a ListView is wrapped in a ListViewItem. Without UI virtualization, the entire data set is kept in memory and an item container is also created for each item in the data set. A ListView that's bound to a collection of 1000 items will also create 1000 ListViewItem containers that are stored in memory."

You need to disable the container and create two DataTemplate and using DataTemplateSelector you can choose which DataTemplate for disable and active items. Check this useful article .