我现有一段代码，已能成功地将"面积计算表"导入到"订单明细表",我是以"单号"

做为不能重复导入的条件，现有个问题麻烦各路高手帮忙解决一下，问题是我原来的“订单明细表”中有了  单号为80  的这一行，如果我要导入的“面积计算表”中也有  单号为80  的这一行,要给我个提示，且不做导入，在改正后再执行以下代码，请帮忙，谢谢

Dim Book As New XLS.Book("e:\\面积计算表.xls")
Dim Sheet As XLS.Sheet = Book.Sheets(0)
Tables("订单明细表").StopRedraw()
\'注意以下数组中列名称的顺序,必须和Excel表中的列顺序一致
Dim nms() As String = {"单号","客户订单号","工程名称","编号","数量","长度1","长度2","长度3","长度4","宽度1","宽度2","宽度3","宽度4"}
\'注意下面的循环变量从1开始,而不是从0开始,因为Excel表的第一行是标题
For n As Integer = 1 To Sheet.Rows.Count -1
    Dim dh As String = sheet(n,0).Text
    If DataTables("订单明细表").Find("单号 = \'" & dh & "\'") Is Nothing Then \'如果不存在同编号的订单
        Dim r As Row = Tables("订单明细表").AddNew()
        For m As Integer = 0 To nms.Length - 1
            r(nms(m)) = Sheet(n,m).Value
        Next
    End If
Next
Tables("订单明细表").ResumeRedraw()

你上面的已经不会重复导入了，要提示的话：

Dim Book As New XLS.Book("e:\\面积计算表.xls")
Dim Sheet As XLS.Sheet = Book.Sheets(0)

Dim s as string
Tables("订单明细表").StopRedraw()
\'注意以下数组中列名称的顺序,必须和Excel表中的列顺序一致
Dim nms() As String = {"单号","客户订单号","工程名称","编号","数量","长度1","长度2","长度3","长度4","宽度1","宽度2","宽度3","宽度4"}
\'注意下面的循环变量从1开始,而不是从0开始,因为Excel表的第一行是标题
For n As Integer = 1 To Sheet.Rows.Count -1
    Dim dh As String = sheet(n,0).Text
    If DataTables("订单明细表").Find("单号 = \'" & dh & "\'") Is Nothing Then \'如果不存在同编号的订单
        Dim r As Row = Tables("订单明细表").AddNew()
        For m As Integer = 0 To nms.Length - 1
            r(nms(m)) = Sheet(n,m).Value
        Next

     Else

          s = s & " " & dh
    End If
Next

Tables("订单明细表").ResumeRedraw()

if s > "" then

    Messagebox.show("以下单号重复，没有导入：" & s)

end if

如果要要把数据导入子表的话能不能实现？比如说导入到“订单管理主表.订单明细表”中

当然可以：

Dim Book As New XLS.Book("e:\\面积计算表.xls")
Dim Sheet As XLS.Sheet = Book.Sheets(0)

Dim s as string
Tables("订单明细表").StopRedraw()
\'注意以下数组中列名称的顺序,必须和Excel表中的列顺序一致
Dim nms() As String = {"单号","客户订单号","工程名称","编号","数量","长度1","长度2","长度3","长度4","宽度1","宽度2","宽度3","宽度4"}
\'注意下面的循环变量从1开始,而不是从0开始,因为Excel表的第一行是标题
For n As Integer = 1 To Sheet.Rows.Count -1
    Dim dh As String = sheet(n,0).Text
    If DataTables("订单明细表").Find("单号 = \'" & dh & "\'") Is Nothing Then \'如果不存在同编号的订单
        Dim r As Row = Tables("订单明细表").AddNew()
        For m As Integer = 0 To nms.Length - 1
            r(nms(m)) = Sheet(n,m).Value
        Next

        r("订单编号") = Tables("订单").Current("订单编号")

     Else

          s = s & " " & dh
    End If
Next

Tables("订单明细表").ResumeRedraw()

if s > "" then

    Messagebox.show("以下单号重复，没有导入：" & s)

end if

Dim Book As New XLS.Book("e:\\面积计算表.xls")
Dim Sheet As XLS.Sheet = Book.Sheets(0)

Dim s as string
Tables("订单明细表").StopRedraw()
\'注意以下数组中列名称的顺序,必须和Excel表中的列顺序一致
Dim nms() As String = {"单号","客户订单号","工程名称","编号","数量","长度1","长度2","长度3","长度4","宽度1","宽度2","宽度3","宽度4"}
\'注意下面的循环变量从1开始,而不是从0开始,因为Excel表的第一行是标题
For n As Integer = 1 To Sheet.Rows.Count -1
    Dim dh As String = sheet(n,0).Text
    If DataTables("订单明细表").Find("单号 = \'" & dh & "\'") Is Nothing Then \'如果不存在同编号的订单
        Dim r As DataRow = DataTables("订单明细表").AddNew()
        For m As Integer = 0 To nms.Length - 1
            r(nms(m)) = Sheet(n,m).Value
        Next

        r("订单编号") = Tables("订单").Current("订单编号")

     Else

          s = s & " " & dh
    End If
Next

Tables("订单明细表").ResumeRedraw()

if s > "" then

    Messagebox.show("以下单号重复，没有导入：" & s)

end if