private void btnDel_Click(object sender, EventArgs e) { #region 使用实体类在各层传递数据 ClassBLL objClass1BLL = new ClassBLL(); ClassModel objClassModel = new ClassModel(); objClassModel.ClaNum = cmbClaNum.Text; if (objClass1BLL.DeleteClass(objClassModel) == true) { objClass1BLL.DeleteClass(objClassModel); MessageBox.Show("数据删除成功"); } else { MessageBox.Show("数据删除失败"); } #endregion ShowClass(); }