Question

My WPF application has a ListBox in it. The ListBox's ItemsSource property is set to a collection of objects I have defined. These all descend from UserControl.

I need to loop over the items in the ListBox in the order that they appear on screen. I believe I can do this by looping over the ListBox's Items collection.

I believe that the objects inthis collection are of type ListBoxItem. How do I get at the objects of my type from the ListBoxItem? In other words, how do I get at the instance of my class descended from UserControl from the ListBoxItem?

EDIT:

Additional information I should have included in the first place:

I need to loop over the Items in the order that they appear in the ListBox so I can select the one closest to the top that matches a particular condition. After I find the one I’m interested in, I need to select it. It’s a single select ListBox, so only one item at a time will be selected.

So, my question really is: How do I select the Item?

Not that it matters, but the reason my type descends from UserControl is because it contains a number of controls that need to be diplayed in the ListBox for each item.

Answer 1

I found that I needed to loop over the items in the Items collection in reverse order. I’m not sure why this is, I thought that the Items collection held everything in the order they appear on screen. Perhaps it’s because the ListBox is sorted in descending order on a DateTime property of the underlying data?

In any case, since I had to loop backwards, I ended up having to write a for loop that started at the end of the collection and worked its way forwards. Since I now had the index of the item I wanted to select, it was easy to just set ListBox.SelectedIndex to that index.