WPF ListBox Scroll to end automatically

Question

In my application, I have a ListBox with items. The application is written in WPF.

How can I scroll automatically to the last added item? I want the

Answer 1

The most easiest way to achieve autoscrolling is to hook on the CollectionChanged event. Just add that functionality to a custom class which derives from ListBox control:

using System.Collections.Specialized;
using System.Windows.Controls;
using System.Windows.Media;

namespace YourProgram.CustomControls
{
  public class AutoScrollListBox : ListBox
  {
      public AutoScrollListBox()
      {
          if (Items != null)
          {
              // Hook to the CollectionChanged event of your ObservableCollection
              ((INotifyCollectionChanged)Items).CollectionChanged += CollectionChange;
          }
      }

      // Is called whenever the item collection changes
      private void CollectionChange(object sender, NotifyCollectionChangedEventArgs e)
      {
          if (Items.Count > 0)
          {
              // Get the ScrollViewer object from the ListBox control
              Border border = (Border)VisualTreeHelper.GetChild(this, 0);
              ScrollViewer SV = (ScrollViewer)VisualTreeHelper.GetChild(border, 0);

              // Scroll to bottom
              SV.ScrollToBottom();
          }
      }
  }
}

Add the namespace of the custom control to your WPF window and use the custom ListBox control: