主题：专业报表合并单元格的完美通用代码

下面的代码打印订单表，并合并前两列，也就是产品和客户两列：

Dim doc As New PrintDoc
Dim rt As New prt.RenderTable
Dim tb As Table = Tables("订单")
Dim ColNames As String() = New String(){"产品", "客户","单价","折扣","数量","金额","日期"}
Dim MergeCols As Integer = 2 '指定要合并的列数
tb.Sort = "产品,客户" '根据合并列排序
rt.Width = "Auto"
rt.CanSplitHorz = True
rt.Style.Font = tb.Font
rt.Style.TextAlignVert = prt.AlignVertEnum.Center
rt.RepeatGridLinesVert = True '换页的时候重复表格线
For c As Integer = 0 To ColNames.Length - 1
    Dim lr As Integer ' 用于保存合并区域的起始行
    rt.Cells(0,c).Text = ColNames(c)
    rt.Cells(0,c).Style.TextAlignHorz = prt.AlignHorzEnum.Center
    rt.Cols(c).Width = tb.Cols(ColNames(c)).PrintWidth
    If tb.Cols(ColNames(c)).IsNumeric Orelse tb.Cols(ColNames(c)).IsDate Then
        rt.Cols(c).Style.TextAlignHorz = prt.AlignHorzEnum.Right
    End If
    For r As integer = 0 To tb.Rows.Count - 1
        If c <= MergeCols - 1 then '如果是要合并的列
            Dim Merge As Boolean = True
            If r = 0 Then
                Merge = False
            Else
                For n As Integer = 0 To c
                    if tb.Rows(r)(ColNames(n)) <> tb.Rows(r - 1)(ColNames(n))
                        Merge = False
                        Exit For
                    End If
                Next
            End If
            If Merge Then
                rt.Cells(lr,c).SpanRows = rt.Cells(lr,c).SpanRows + 1
            Else
                rt.Cells(r + 1, c).Text = tb.Rows(r)(ColNames(c))
                rt.Cells(r + 1, c).VertSplitBehavior = prt.CellSplitBehaviorEnum.Copy
                lr = r + 1
            End If
        Else
            rt.Cells(r + 1, c).Text = tb.Rows(r)(ColNames(c))
        End If
    Next
Next
rt.Style.Gridlines.All = New prt.Linedef(Color.Gray)
rt.CellStyle.Spacing.All = 0.5
rt.Rows(0).Style.TextAlignHorz = prt.AlignHorzEnum.Center
rt.RowGroups(0,1).Header = prt.TableHeaderEnum.All
doc.Body.Children.Add(rt)
doc.Preview()

上面的代码是通用的，要打印其它表格或者合并不同的列时，只需修改下面四行代码：

Dim tb As Table = Tables("订单")
Dim ColNames As String() = New String(){"产品", "客户","单价","折扣","数量","金额","日期"}
Dim MergeCols As Integer = 2 '指定要合并的列数
tb.Sort = "产品,客户" '根据合并列排序

注意指定要打印列的时候，要合并的列必须位于最前面。