C＃：如何在WindowsForm应用程序的列表框中保持所选项目的突出显示？

Question

I have a ListBox where I select some Item (s) in it which get highlighted. Then I press a Button to move the Item up. After I click that 'up' Button and it does what it's supposed to, that same Item isn't highlighted anymore - which I still want it to be.
How come?

I looked up the properties for ListBox and didn't see anything that would match this situation. However, I did see a ListView property called HideSelection that seems to be what I'm looking for, but my Control isn't a ListView , it's a ListBox .

Basically the question is:
How do I keep those Item s highlighted after I click the Button ?
I'm a little lost. Any help would be appreciated.

Answer 1

If I didn't understand wrong you are looking for SetSelected() method.

private void button1_Click(object sender, EventArgs e)
        {
            if (listBox1.SelectedIndex > 0)
            {
                int selectedIndex = listBox1.SelectedIndex;
                object selectedItem = listBox1.SelectedItem;
                listBox1.Items.Remove(selectedItem);
                listBox1.Items.Insert(selectedIndex - 1, selectedItem);
                listBox1.SetSelected(selectedIndex -1, true); // here we go
            }
        }

Result;

Hope helps,