ItemContainerGenerator.ContainerFromItem() returns null while VirtualizingStackPanel.IsVirtualizing=“False”

Question

I\'m facing a similar problem with this question however VirtualizingStackPanel.IsVirtualizing=\"False\" didn\'t solve my problem. Is there anyone facing the sa

Answer 1

try execute UpdateLayout() before this.ItemContainerGenerator.ContainerFromItem(item)

Answer 2

Use ItemContainerGenerator.StatusChanged event from you ComboBox like this:

myComboBox.ItemContainerGenerator.StatusChanged += ItemContainerGenerator_StatusChanged;

void ItemContainerGenerator_StatusChanged(object sender, System.EventArgs e)
{
    if (myComboBox.ItemContainerGenerator.Status == GeneratorStatus.ContainersGenerated)
    {
        foreach (var item in myComboBox.Items)
        {
            var container = (ComboBoxItem)LanguageComboBox.ItemContainerGenerator.ContainerFromItem(item);
        }
    }
}

Answer 3

As my logic was in the SelectionChanged event, i wondered why the ItemContainerGenerator.ContainerFromItem method always returned null even if the Listbox.SelectedItem was not null and even more strange, Virtualisation was turned off! Looking at the ItemContainerGenerator.Status i saw that it was Primitives.GeneratorStatus.NotStarted then i added a simple test on ItemContainerGenerator.Status == Primitives.GeneratorStatus.ContainersGenerated and finally solved it that way and no need to subsribe to the Status_Changed event.