Dim dt As Table = Tables("订单")
Dim Book As New XLS.Book \'定义一个Excel工作簿
Dim Sheet As XLS.Sheet = Book.Sheets(0) \'引用工作簿的第一个工作表
Dim Style As Xls.Style = Book.NewStyle \'新建一个样式
Style.BackColor = Color.Red \'样式的背景颜色设为红色
For c As Integer = 0 To dt.Cols.Count -1 \'添加列标题
    Sheet(0, c).Value = dt.Cols(c).Name
Next
For r As Integer = 0 To dt.Rows.Count - 1 \'填入数据
    For c As Integer = 0 To dt.Cols.Count -1
        Sheet(r +1, c).Value = dt.rows(r)(c)
    Next
    If dt.rows(r)("折扣") >= 0.15 Then \'如果折扣大于等于0.15
        Sheet(r + 1,dt.Cols("折扣").Index).Style = Style \'设置折扣单元格的样式
    End If
Next
\'打开工作簿
Book.Save("c:\\reports\\test.xls")
Dim Proc As New Process
Proc.File = "c:\\reports\\test.xls"
Proc.Start()

按帮助导出的电子表没有网格线

把样式加上

http://www.foxtable.com/webhelp/scr/1163.htm