C# ListView失去焦点仍然保持选中的Item高亮

private void listView_Validated( object sender, EventArgs e)
{
    if (listView.FocusedItem != null )
       {
            listView.FocusedItem.BackColor = SystemColors.Highlight;
            listView.FocusedItem.ForeColor = Color.White;
        }
}
 
private void listView_ItemSelectionChanged( object sender, ListViewItemSelectionChangedEventArgs e)
{
    e.Item.ForeColor = Color.Black;
    e.Item.BackColor = SystemColors.Window;
 
    if (listView.FocusedItem != null )
    {
        listView.FocusedItem.Selected = true ;
    }
}