如何：计算所有节点的合计

下面的示例演示了如何计算绑定到“Size(Bytes)”字段的列的合计。通过 TreeListColumn.SummaryFooter 和 TreeListColumn.SummaryFooterStrFormat 属性设置函数类型和汇总值的格式。

TreeListColumn.AllNodesSummary 属性值被设置为 true，以计算控件中所有节点的汇总。启用了 TreeListOptionsView.ShowSummaryFooter 选项来显示汇总脚注。

C#	复制代码
using DevExpress.XtraTreeList; using DevExpress.XtraTreeList.Columns; // ... treeList1.OptionsView.ShowSummaryFooter = true; TreeListColumn column = treeList1.Columns["Size(Bytes)"]; column.AllNodesSummary = true; column.SummaryFooterStrFormat = "Total Sum {0:n0}"; column.SummaryFooter = SummaryItemType.Sum;

复制代码

using DevExpress.XtraTreeList;
using DevExpress.XtraTreeList.Columns;
// ...
treeList1.OptionsView.ShowSummaryFooter = true;
TreeListColumn column = treeList1.Columns["Size(Bytes)"];
column.AllNodesSummary = true;
column.SummaryFooterStrFormat = "Total Sum {0:n0}";
column.SummaryFooter = SummaryItemType.Sum;

Visual Basic	复制代码
Imports DevExpress.XtraTreeList Imports DevExpress.XtraTreeList.Columns ' ... TreeList1.OptionsView.ShowSummaryFooter = True Dim Column As TreeListColumn = TreeList1.Columns("Size(Bytes)") Column.AllNodesSummary = True Column.SummaryFooterStrFormat = "Total Sum {0:n0}" Column.SummaryFooter = SummaryItemType.Sum

Visual Basic

复制代码

Imports DevExpress.XtraTreeList
Imports DevExpress.XtraTreeList.Columns
' ...
TreeList1.OptionsView.ShowSummaryFooter = True
Dim Column As TreeListColumn = TreeList1.Columns("Size(Bytes)")
Column.AllNodesSummary = True
Column.SummaryFooterStrFormat = "Total Sum {0:n0}"
Column.SummaryFooter = SummaryItemType.Sum