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

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

Tables("表A").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 = {"第一列","第二列","第三列"} 

\'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 bh As String = sheet(n,0).Text 

    If DataTables("表A").Find("第一列 = \'" & bh & "\'") Is Nothing Then \'如果不存在同编号的订单

        Dim r As Row = Tables("表A").AddNew()

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

            r(nms(m)) = Sheet(n,m).Value

        Next

    End If

Next

Tables("表A").ResumeRedraw()