C# 防止在按下右或左箭头键时对列表框控件执行默认操作

Question

I have a listbox control in a windows app and I want to disable the default right and left arrow keydown event triggers. Currently when you press right or left arrows the selected item travels up and down the listbox. I want to add my own actions.

Answer 1

Try adding an event handler to the ListBox.KeyDown event. If the key pressed is an arrow key, set the Handled flag of the KeyPressEventArgs to true to prevent further processing.

A code example, based on an MSDN Forum post

private void listBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
{
  If (e.KeyCode == Keys.Right || e.KeyCode == Keys.Left)
    e.Handled = true;
}

Answer 2

You have to override the ProcessCmdKey method in the listbox control. Create a new class, derive it from listbox, then override the ProcessCmdKey.