wpf - ItemContainerGenerator.ContainerFromItem() returns null?

Question

I'm having a bit of weird behavior that I can't seem to work out. When I iterate through the items in my ListBox.ItemsSource property, I can't seem to get the container? I'm expecting to see a ListBoxItem returned, but I only get null.

Any ideas?

Here's the bit of code I'm using:

this.lstResults.ItemsSource.ForEach(t =>
    {
        ListBoxItem lbi = this.lstResults.ItemContainerGenerator.ContainerFromItem(t) as ListBoxItem;

        if (lbi != null)
        {
            this.AddToolTip(lbi);
        }
    });

The ItemsSource is currently set to a Dictionary and does contain a number of KVPs.

question from:https://stackoverflow.com/questions/6713365/itemcontainergenerator-containerfromitem-returns-null

Answer 1

I found something that worked better for my case in this StackOverflow question:

Get row in datagrid

By putting in UpdateLayout and a ScrollIntoView calls before calling ContainerFromItem or ContainerFromIndex, you cause that part of the DataGrid to be realized which makes it possible for it return a value for ContainerFromItem/ContainerFromIndex:

dataGrid.UpdateLayout();
dataGrid.ScrollIntoView(dataGrid.Items[index]);
var row = (DataGridRow)dataGrid.ItemContainerGenerator.ContainerFromIndex(index);

If you don't want the current location in the DataGrid to change, this probably isn't a good solution for you but if that's OK, it works without having to turn off virtualizing.