C# 如何滚动到列表框的底部？
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How to scroll to bottom of ListBox?
提问by JYelton
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 SelectionModeis set to none. The user can scroll the list but I would prefer it start out scrolled to the end.
我使用 Winforms ListBox 作为一个小的事件列表，并希望填充它以便最后一个事件（底部）可见。该SelectionMode设置为none。用户可以滚动列表，但我希望它开始滚动到最后。
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.
纵观缺乏对事物的支持喜欢ScrollIntoView，EnsureVisible，我假设我需要创建一个自定义的控件从Control继承; 但是我不确定从那里开始做什么。
Some pointers?
一些指针？
采纳答案by Jon
回答by user1032613
Scroll to the bottom:
滚动到底部：
listbox.TopIndex = listbox.Items.Count - 1;
listbox.TopIndex = listbox.Items.Count - 1;
Scroll to the bottom, and select the last item:
滚动到底部，然后选择最后一项：
listbox.SelectedIndex = listbox.Items.Count - 1;
listbox.SelectedIndex = listbox.Items.Count - 1;
回答by Sean Vikoren
This is what I ended up with for WPF (.Net Framework 4.6.1):
这就是我对 WPF（.Net Framework 4.6.1）的最终结果：
Scroll.ToBottom(listBox);
Using the following utility class:
使用以下实用程序类：
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(); }
};
}
}
}
