多亏了Jimi，我最终得到了这个解决方案--如果在标题单元格中单击（用于排序），则由CellClick事件设置sortClick标志。它在SelectionChanged事件中拾取，如果设置，将清除DGV选择。

private void ArchersGrid_SelectionChanged(object sender, EventArgs e)                                                                               
{
   if (sortClick)                       
   {
       sortClick = false;
       ArchersGrid.ClearSelection(); // Clear any selection caused by sort (no row to select).
   }
   else            
   {
      // code for any other selection change              
   }                                
}        

private void ArchersGrid_CellClick(object sender, DataGridViewCellEventArgs e)
{
   if (e.RowIndex == -1)
   {
      sortClick = true;
   }
   else
   {
      sortClick = false;
   }
}