Comments on: WPF ListBox Virtualization

By: Saurabh Dighade

Saurabh Dighade — Fri, 02 Sep 2011 13:45:30 +0000

Hi Nick,

I have used something similar you mentioned above i.e. Nested observable
collection.

For example say
I have an observable collection of ObservableCollection and Each day is in Turn is an ObservableCollection
The way I have represented this in a horizontal Listbox of Day as Column which is Virtualized with VirtualizationMode set to Recycling (Call it a DayListBOX).
Each Day i.e. column is another List box of appointments (call it a AppointmentListbox)

Now I scroll to say 15th day and I delete and appointment from day 1 in the AppointmentListbox. The DayListBOX scrolls back to the 1st Day.

I tried getting the Verticaloffset and the horizontaloffset of the DayListBOX and after deleting an appointment tried setting it back but doesn

By: Nick

Nick — Mon, 15 Feb 2010 18:52:45 +0000

Unfortunately, some of the stuff I do is under NDA for clients, but the concept is simple. Have an ObservableCollection> and bind the list of lists to your ListBox. Then create two datatemplates, one for showing the list of items in each row as a ItemsControl or something similar, and the second to actually template the individual items.

I wrote a class to abstract some logic that you could pass in a collection and a number of “columns” and it would split up a list for you into a list of lists automatically, but it’s certainly doable manually for small scenarios

By: Brian Vallelunga

Brian Vallelunga — Mon, 15 Feb 2010 18:35:32 +0000

I’m doing the exact same thing you are with a little personal application and found your post on this subject.

Any chance you’ll release the code to your multi-column view you created?

By: Sergey

Sergey — Sun, 03 May 2009 13:54:26 +0000

If ListBox is inside a vertically unconstrained control, your virtualization will dissapear because ListBox thinks it has unlimited amount of space for its rows. Example: put listbox inside vertical stack panel.