how can I add a special first item in wp7 listbox?

Question

The listbox has a datatemplate, but I want add a special item to the listbox, which can not be processed by the datatemplate. How can I do this?

Answer 1

If you have the CompositeCollection at your disposal (- sorry if you don't -) you could try to work with that.

private void ListBox_Loaded(object sender, RoutedEventArgs e)
{
    var specialItem = new ListBoxItem()
    {
        Content = "Very special item.",
        FontWeight = FontWeights.Bold
    };
    var collectionContainer = new CollectionContainer()
    {
        Collection = MyCollection
    };
    var composite = new CompositeCollection();
    composite.Add(specialItem);
    composite.Add(collectionContainer);
    (sender as ListBox).ItemsSource = composite;
}

Answer 2

如果您的列表框具有合理数量的项目，则可以将列表框的AlternationCount设置为大于您的项目计数，并在ListBoxItem的AlternationIndex上使用DataTrigger进行某些特殊操作，例如，如果它等于0，则切换模板