Get index of ListBoxItem - WPF

Question

How do I get the index of a ListBoxItem?

The ListBox has binding to a collection of XML nodes through XmlDataProvider.

Solution 1

I had a similar question which was answered here

Basically you set the ListBox's AlternationCount to something really high, and bind to the AlternationIndex on each item

<ListBox AlternationCount="100">
    <ListBox.ItemTemplate>
        <DataTemplate>
            <TextBlock Text="{Binding RelativeSource={RelativeSource Mode=TemplatedParent},
                                      Path=(ItemsControl.AlternationIndex)}" />
        </DataTemplate>
    </ListBox.ItemTemplate>
</ListBox>

Solution 2

You can get the index of the ListBoxItem from the ItemContainerGenerator:

listBox.ItemContainerGenerator.IndexFromContainer(listBoxItem);

Comments

[Rachel]

@Greg: Agreed, but it's the only way I've found to do it so far with a ListBox. I'm hoping they add a property in some future version of WPF

[Rachel]

@punker76 I think ListBoxes are Virtualized by default, so that shouldn't be the case

[punker76]

@Rachel ok, virtualisation is the default, but the alternation index doesn't works. i created a little project, try scrolling down and up and you will see jkarger.de/WpfStackOverflowSpielWiese.exe (.net 4)