windows ListBox：显示多个选定的项目？
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ListBox: Display multiple selected items?
提问by Surya sasidhar
When I select multiple items in a ListBox, how can I display them? Any help will be appreciated.
当我在 a 中选择多个项目时ListBox，如何显示它们？任何帮助将不胜感激。
回答by Donut
First, you need to set the SelectionModeproperty on your ListBoxto either SelectionMode.MultiSimpleor SelectionMode.MultiExtended(so that you canselect multiple items).
首先，您需要将您的SelectionMode属性设置ListBox为SelectionMode.MultiSimple或SelectionMode.MultiExtended（以便您可以选择多个项目）。
Next, you need to add an event handler for the SelectedIndexChangedevent on your ListBox. Within this event handler, accessing the SelectedItemscollection of your ListBoxwill provide you with access to a collection of all the selected objects.
接下来，您需要为SelectedIndexChanged您的ListBox. 在此事件处理程序中，访问SelectedItems您的集合ListBox将为您提供对所有选定对象的集合的访问。
From there, you can iterate through the collection to display the objects in any manner you choose. Here's an example event handler that displays the selected items in a TextBoxcalled textBox1:
从那里，您可以遍历集合，以您选择的任何方式显示对象。这是一个示例事件处理程序，它在一个TextBox被调用的中显示所选项目textBox1：
private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
{
textBox1.Clear();
foreach (object selectedItem in listBox1.SelectedItems)
{
textBox1.AppendText(selectedItem.ToString() + Environment.NewLine);
}
}
