ClistCtrl删光所有行和列的方法

this->m_list.DeleteAllItems();int nCount = this->m_list.GetHeaderCtrl()->GetItemCount();for (int l = 0; l < nCount; l++){   this->m_list.DeleteColumn(0);//注：此处只能用m_list.DeleteColumn(0)方法，不可用this->m_list.GetHeaderCtrl(0)!!}