主题：[求助]晕了！分组打印和打印部分列

专业报表事例有说到分组打印,如果希望只打印选定的组,怎么做呢?又或者说如何打印筛选出的行?

设置了一个组合框"日期"筛选出指定日期的行.用下面的代码会打印出所有组的报表:

Dim doc As New PrintDoc
Dim rt As Prt.RenderTable
Dim rx As prt.RenderText
Dim tbl As Table = Tables("记录")
'Dim Date As String = e.Form.Controls("日期").Value
Dim Rows As List(Of DataRow)
Dim Datas As List(Of String) = tbl.DataTable.GetValues("日期")
doc.Pagesetting.LandScape = True
For Each Data As String In Datas
    rx = New prt.RenderText
    rx.Style.FontSize = 14
    rx.Style.FontBold = True
    rx.Style.Spacing.Bottom = 2
    rx.Text = "日期: " & Data
    doc.Body.Children.Add(rx)
    rt = New prt.RenderTable
    rt.Style.Font = Tables("记录").Font
    rt.Style.TextAlignVert = prt.AlignVertEnum.Center
    rt.Style.GridLines.All = New prt.LineDef(0.3,Color.LightGray)
    rt.Style.Spacing.Bottom = 5
    rt.CellStyle.Spacing.All = 1
    rt.Style.Font = tbl.Font
    Rows = tbl.DataTable.Select("[日期] = '" & Data & "'")
    For c As Integer = 0 To tbl.Cols.Count - 1
        rt.Cells(0,c).Text = tbl.Cols(c).Name
        rt.Cols(c).Width = tbl.Cols(c).PrintWidth
        For r As Integer = 0 To Rows.Count -1
            rt.Cells(r + 1, c).Text = rows(r)(tbl.Cols(c).Name)
        Next
    Next
    rt.RowGroups(0,1).Header = prt.TableHeaderEnum.All
    doc.Body.Children.Add(rt)
Next
doc.preview()