private void btnSearch_Click(object sender, EventArgs e) { #region 使用实体类在三层中传递数据 ClassBLL objClass1BLL = new ClassBLL(); ClassModel objClassModel = new ClassModel(); DataBaseOperaClass objDataBase = new DataBaseOperaClass(); objClassModel.ClaNum = cmbClaNum.Text; dgvClass.DataSource = objClass1BLL.SearchClass(objClassModel); #endregion ShowClass(); }