C# DEV控件dll文件

使用DevExpress GridControl 时，有一栏为colSelected(FieldName 为"Selected") ,需根据此栏是否选中来计算另外一栏colCurrentApplyQuantity(FieldName 为"CurrentApplyQuantity")的Summary. 依据默认的SummaryItem是无法实现的，需要使用Custom Aggregate Functions. 具体处理过程如下： 1.设置Gridview OptionsView ShowFooter 为True，用来显示最终的Summary。 2.设置colCurrentApplyQuantity 的SummaryType为Custome ,Tag 为1.Tag是用来区分SummaryItem.如需要格式化显示的结果，可设置相应的DisplayFormat. 3.使用gridView1_CustomSummaryCalculate事件来实现依据colSelected来colCurrentApplyQuantity的Summary。求和包括3个阶段，Initialization, Calculation 和Finalization。依据 CustomSummaryEventArgs.SummaryProcess的值来决定当前进行的那个阶段。具体实现如下： int customSum; private void gridView1_CustomSummaryCalculate(object sender, DevExpress.Data.CustomSummaryEventArgs e) { int summaryID = Convert.ToInt32((e.Item as GridSummaryItem).Tag); GridView gridView = sender as GridView; // Initialization if (e.SummaryProcess == CustomSummaryProcess.Start) { customSum = 0; } // Calculation if (e.SummaryProcess == CustomSummaryProcess.Calculate) { bool isSelected = (bool)gridView.GetRowCellValue(e.RowHandle, "Selected"); switch (summaryID) { case 1: // The total summary calculated against the 'CurrentApplyQuantity' column. if (isSelected) customSum += Convert.ToInt32(e.FieldValue); break; } } // Finalization if (e.SummaryProcess == CustomSummaryProcess.Finalize) { switch (summaryID) { case 1: e.TotalValue = customSum; break; } } }