GridControl页脚显示列的汇总数据

关键属性：
gridView4.OptionsView.ShowFooter = true;//启用显示页脚
            
//索引为1的列
gridView4.Columns[1].SummaryItem.DisplayFormat = "{0:0.##}";
gridView4.Columns[1].SummaryItem.FieldName = "TotalMoney";
gridView4.Columns[1].SummaryItem.SummaryType = DevExpress.Data.SummaryItemType.Sum;//求和
//索引为2的列
gridView4.Columns[2].SummaryItem.DisplayFormat = "{0:0.##}";
gridView4.Columns[2].SummaryItem.FieldName = "PayTotalMoney";
gridView4.Columns[2].SummaryItem.SummaryType = DevExpress.Data.SummaryItemType.Sum;//求和
//索引为3的列
gridView4.Columns[3].SummaryItem.DisplayFormat = "{0:0.##}";
gridView4.Columns[3].SummaryItem.FieldName = "UnPayMoney";
gridView4.Columns[3].SummaryItem.SummaryType = DevExpress.Data.SummaryItemType.Sum;//求和
gridView4.CustomDrawFooterCell += new FooterCellCustomDrawEventHandler(this.gridView4_CustomDrawFooterCell);//设置一下对齐方式，通过GridView的CustomDrawFooterCell 事件

给页脚加数据汇总