Dim dtb As New DataTableBuilder("统计")
dtb.AddDef("客户", Gettype(String), 16)
Dim prds As List(of String) = DataTables("订单").GetValues("产品")
Dim str As String = ""
For Each prd As String In prds
dtb.AddDef(prd, Gettype(Double))
str = str & CExp(" + isnull({0},0)",prd)
Next
msgbox(str)
dtb.AddDef("合计", Gettype(Double), str.Trim("","+"))
dtb.Build()