How to scroll to bottom of ListBox?

Question

I am using a Winforms ListBox as a small list of events, and want to populate it so that the last event (bottom) is visible. The SelectionMode is set to none. The user can scroll the list but I would prefer it start out scrolled to the end.

Looking at the lack of support for things like ScrollIntoView, EnsureVisible, I am assuming I will need to create a custom control that inherits from ListBox; however I'm not sure what to do from there.

Some pointers?

Did the normal `listBox1.SelectedIndex = listBox1.Items.Count - 1;` not work for you? — M.Babcock, Jan 09 '12 at 23:42
That works when `SelectionMode` is not set to `None`. I need to prevent selecting items in this particular list (to avoid user confusion). — JYelton, Jan 09 '12 at 23:44

score 98 · Accepted Answer · answered Jan 09 '12 at 23:49

98

I believe you can do that easily by setting the TopIndex property appropriately.

For example:

int visibleItems = listBox.ClientSize.Height / listBox.ItemHeight;
listBox.TopIndex = Math.Max(listBox.Items.Count - visibleItems + 1, 0);

answered Jan 09 '12 at 23:49

Jon

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+1 A bit convoluted, but that's certainly not your fault! Thanks for the solution and example. – JYelton Jan 10 '12 at 00:05
44

It seems to work fine if you just set `TopIndex` to the last item instead of worrying about which should really be at the top, e.g. `listBox.TopIndex = listBox.Items.Count - 1;` – Craig W Nov 08 '13 at 04:13

WSBT · Answer 2 · 2018-06-13T17:36:32.057

80

Scroll to the bottom:

listbox.TopIndex = listbox.Items.Count - 1;

Scroll to the bottom, and select the last item:

listbox.SelectedIndex = listbox.Items.Count - 1;

edited Jun 13 '18 at 17:36

answered Oct 29 '15 at 16:04

WSBT

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I prefer this solution, much simpler. Thanks! – Just Rudy Mar 22 '17 at 13:59
Best solution., – Vinicius Gonçalves Jul 28 '17 at 18:56
My ListBox doesn't have a `TopIndex` property (no idea why) and setting `SelectedIndex` doesn't scroll to the selection. – Malcolm Mar 06 '19 at 21:25
@Malcolm Are you using winforms? – markf78 Apr 07 '19 at 13:22
@markf78 WPF, my bad. That'll teach me to gloss over question tags >_ – Malcolm Apr 08 '19 at 19:32

Sean Vikoren · Answer 3 · 2018-11-01T19:26:47.867

This is what I ended up with for WPF (.Net Framework 4.6.1):

Scroll.ToBottom(listBox);

Using the following utility class:

public partial class Scroll
{
    private static ScrollViewer FindViewer(DependencyObject root)
    {
        var queue = new Queue<DependencyObject>(new[] { root });

        do
        {
            var item = queue.Dequeue();
            if (item is ScrollViewer) { return (ScrollViewer)item; }
            var count = VisualTreeHelper.GetChildrenCount(item);
            for (var i = 0; i < count; i++) { queue.Enqueue(VisualTreeHelper.GetChild(item, i)); }
        } while (queue.Count > 0);

        return null;
    }

    public static void ToBottom(ListBox listBox)
    {
        var scrollViewer = FindViewer(listBox);

        if (scrollViewer != null)
        {
            scrollViewer.ScrollChanged += (o, args) =>
            {
                if (args.ExtentHeightChange > 0) { scrollViewer.ScrollToBottom(); }
            };
        }
    }
}

@LarsTech That is an excellent point, but my answer may help a few WPF people, yes? — Sean Vikoren, Nov 16 '18 at 23:27

score 0 · Answer 4 · answered Mar 04 '21 at 19:02

If you want a winforms listbox that "sticks to bottom when at bottom" you can:

int visibleItems = lb.ClientSize.Height / lb.ItemHeight;
if (lb.Items.Count > lb && lb.TopIndex > lb.Items.Count - visibleItems - 2)
  lb.TopIndex = lb.Items.Count - visibleItems + 1;

When scrolled to bottom, new items will cause it to scroll down to show them, but if you scroll up a bit, then it ceases its "jump to bottom" behavior yso you can carry on looking at what you scrolled up to see

How to scroll to bottom of ListBox?

4 Answers4

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