Get index of ListBoxItem - WPF
How do I get the index of a ListBoxItem
?
The ListBox
has binding to a collection of XML nodes开发者_如何学运维 through XmlDataProvider
.
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>
You can get the index of the ListBoxItem
from the ItemContainerGenerator
:
listBox.ItemContainerGenerator.IndexFromContainer(listBoxItem);
The property SelectedIndex
would work. It all depends on how you're doing your binding
You probably want to bind the SelectedIndex
dependency property to some property of the object connected to it's datacontext e.g.
<ListBox SelectedIndex="{Binding MySelectedIndex}" ItemsSource="{Binding MyItems}"/>
but you could obviously do this
<ListBox SelectedIndex="{Binding MySelectedIndex}">
<ListBoxItem>1</ListBoxItem>
<ListBoxItem>2</ListBoxItem>
<ListBoxItem>3</ListBoxItem>
<ListBoxItem>4</ListBoxItem>
</ListBox>
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