主题：导入更新，但有新数据不会自动追加。如何修改代码

你能写出以上复杂的代码，做一些变通调整不至于不会啊。

更新和新增数据，帮助都有例子：

帮助：

其中有个例子，如果存在相同编号的订单，则覆盖原来的订单，否则新增一个订单，代码为：

Dim Book As New XLS.Book("c:\test\订单.xls")

Dim Sheet As XLS.Sheet = Book.Sheets(0)

Tables("订单").StopRedraw()

Dim nms() As String = {"编号","产品","客户","雇员","单价","折扣","数量","日期"}

For n As Integer = 1 To Sheet.Rows.Count -1

    Dim bh As String = sheet(n,0).Text

    Dim dr As DataRow = DataTables("订单").Find("编号 = '" & bh & "'")

    If dr Is Nothing Then '如果不存在同编号的订单

        dr =  DataTables("订单").AddNew()

    End If

    For m As Integer = 0 To nms.Length - 1

        dr(nms(m)) = Sheet(n,m).Value

    Next

Next

Tables("订单").ResumeRedraw()

如果要改为：如果编号为空，不执行操作，如果存在相同编号的订单，则覆盖原来的订单，否则新增一个订单，代码稍作调整即可：

Dim Book As New XLS.Book("c:\test\订单.xls")

Dim Sheet As XLS.Sheet = Book.Sheets(0)

Tables("订单").StopRedraw()

Dim nms() As String = {"编号","产品","客户","雇员","单价","折扣","数量","日期"}

For n As Integer = 1 To Sheet.Rows.Count -1

    Dim bh As String = sheet(n,0).Text

    Dim dr As DataRow = DataTables("订单").Find("编号 = '" & bh & "'")

    If dr Is Nothing Then '如果不存在同编号的订单

        dr =  DataTables("订单").AddNew()

    End If

    For m As Integer = 0 To nms.Length - 1

        dr(nms(m)) = Sheet(n,m).Value

    Next

Next

Tables("订单").ResumeRedraw()

代码并不复杂，自己体会消化。