主题：[求助]如何用专业报表打印多层分组统计？

开发指南中介绍两个实例代码

打印统计数据：

Dim dt As DataTable

Dim g As New GroupTableBuilder("统计表1", DataTables("订单"))

g.Groups.AddDef("产品")

g.Totals.AddDef("数量")

g.Totals.AddDef("金额")

dt = g.Build(True)

Dim doc As New PrintDoc

Dim rt As New prt.RenderTable

Dim Count As Integer = 0

For Each Col As DataCol In Dt.DataCols

    rt.Cells(0,Count).Text = Col.Name

    For r As Integer = 0 To dt.DataRows.Count - 1

        rt.Cells(r +1,Count).Text = dt.DataRows(r)(Col.Name)

    Next

    Count = Count + 1

Next

rt.Style.Gridlines.All = New prt.Linedef(Color.Gray)

rt.CellStyle.Spacing.All = 1

rt.Rows(0).Style.TextAlignHorz = prt.AlignHorzEnum.Center

doc.Body.Children.Add(rt)

doc.Preview()

 

直接进行统计：

Dim dt As DataTable

Dim Names As List(Of String) = Tables("订单").DataTable.GetUniqueValues("","产品")

Dim doc As New PrintDoc

Dim rt As New prt.RenderTable

rt.Cells(0,0).Text = "产品"

rt.Cells(0,2).Text = "数量"

rt.Cells(0,3).Text = "金额"

For i As Integer = 0 To Names.Count -1

    rt.Cells(i+1,0).Text= Names(i)

    rt.Cells(i+1,2).Text = Tables("订单").DataTable.Compute("Sum(数量)","产品='" & Names(i) & "'")

    rt.Cells(i+1,3).Text = Tables("订单").DataTable.Compute("Sum(金额)","产品='" & Names(i) & "'")

Next

rt.Style.Gridlines.All = New prt.Linedef(Color.Gray) '灰色网格线

rt.CellStyle.Spacing.All = 1 '内容距离网格线1毫米

rt.Rows(0).Style.TextAlignHorz = prt.AlignHorzEnum.Center '第一行内容水平居中

doc.Body.Children.Add(rt)

doc.Preview()

 

预览结果都一样：

产品	数量	金额
PD01	11290	171754.92
PD02	18200	296522.5
PD03	7000	61490
PD04	5480	102861
PD05	10400	19023.15

 

代码十分简单方便。

但我希望得到多层分组的统计表,如下：

 

 

产品	雇员	数量	金额
PD01小计		11290	171754.92
	EP01	3100	47160.3
	EP02	3500	53245.5
	EP03	4050	61612.65
	EP05	640	9736.47
PD02小计		18200	296522.5
	EP01
	EP02
	EP04
	..
PD03小计		7000	61490
	EP01
	EP03
	EP04
	…
…

请教此代码应如何编?