I was hoping you’d have some insight as to how i am misusing your classes to cause them to deadlock like this?

I keep finding my app getting stuck, (not responding to input) and if i break in visual studio, it’s here:

private void RaiseCollectionChangedEvent(NotifyCollectionChangedEventArgs e)
{
if (CollectionChanged != null)
{
CollectionChanged(this, e); //

So you’re saying that with a virtualizing panel, once a replaced item has scrolled out of view, it then doesn’t display properly when scrolled back into view? Is that right?
How/where are the templates defined? – presumably you have one for the bogus object and one for the real one.
Also, I’m not clear on what the end result should be. You can set an ObjectDataProvider to load a collection aynchronously, but I gather you want to load specific items on demand, but with only an ID for each item how can the user determine which one they want loaded – and if they’re all in a StackPanel how does the user signal which one to load. I’m sorry but I’m a bit confused!!

I have a problem that I was hoping to solve with your class but I am still having the same issue.

Basically, I am writing my own observable list that represent a remote collection (located on some server on the net). All I have at time of creation is a list of ID and no data.

I am keeping a list of integer (my ids) and the count method return the number of ids. I am using the items collection for the downloaded object.

When the listbox access an item via the operator [] I insert return a bogus object in the collection and I return it, then I spawn a thread and go download the data from the server. When the data is retrieved, I replace the bogus data in the items collection with the downloaded data. This triggers a replace event.

The listbox, when use with a VirtualizeStackPanel or any other virtualize panel (I wrote some), will replace the data fine until it removes data that is no longer visible. After that, I don’t always the update to work! This is really frustrating!

Hope you have any idea.

No I haven’t done any profiling with any of the classes above. (oh the shame!) Which class were you referring to, and what’s the problem you’re having at the moment?

ps Sorry for the delay in responding – have been on holiday.

John