#982 – Executing Code When Selected Items in a ListBox Change

You can handle the SelectionChanged event for a ListBox to react to a change in the currently selected items.

Within the event handler, you can inspect the following properties of the SelectionChangedEventArgs parameter:

  • AddedItems – Collection of items just selected, type matches type of object in collection that ListBox is bound to
  • AddedInfos – Can get index and ListBoxItem for added items
  • RemovedItems – Collection of items just unselected
  • RemovedInfos – Get index and ListBoxItem for removed items
        <ListBox Name="lbActors" Margin="15" Width="200" Height="190"
                 ItemsSource="{Binding ActorList}"
                 SelectionMode="Extended"
                 SelectionChanged="lbActors_SelectionChanged"/>
        <TextBlock Name="tbInfo"/>

 

        private void lbActors_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            StringBuilder sbInfo = new StringBuilder();

            sbInfo.AppendLine("Added:");
            foreach (object o in e.AddedItems)
            {
                Actor a = o as Actor;
                sbInfo.AppendLine(a.FullName);
            }

            sbInfo.AppendLine("Removed:");
            foreach (object o in e.RemovedItems)
            {
                Actor a = o as Actor;
                sbInfo.AppendLine(a.FullName);
            }

            tbInfo.Text = sbInfo.ToString();
        }

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About Sean
Software developer in the Twin Cities area, passionate about software development and sailing.

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