请问下面的代码如何在导入前把EXCEL文件中   -  - 的替换成空，还有实现同时多个EXCEL文件导入？谢谢

Dim dlg As New OpenFileDialog

dlg.Filter= "Excel文件|*.xls;*.xlsx" \'设置筛选器

If dlg.ShowDialog = DialogResult.Ok Then \'如果用户单击了确定按钮

    DataTables("dkye").StopRedraw

    Dim App As New MSExcel.Application

    try

        Dim Wb As MSExcel.WorkBook = App.WorkBooks.Open(dlg.FileName)

        Dim Ws As MSExcel.WorkSheet = Wb.WorkSheets(1)

        Dim Rg As MSExcel.Range = Ws.UsedRange

        Dim ary = rg.value

        For n As Integer = 5 To rg.Rows.Count - 1

            Dim ro As Row = Tables("dkye").AddNew

            For i As Integer = 0 To Tables("dkye").Cols.Count - 6

                ro(i) = ary(n,i+1)

                ws.usedrange.replace ("    -  -","")

            Next

        Next

        MessageBox.Show("导入成功!","恭喜!")

    catch ex As exception

        msgbox(ex.message)

        MessageBox.Show("导入失败!","恭喜!")

    finally

        DataTables("dkye").ResumeRedraw

        app.quit

    End try

End If

2.你要替换哪里的   -     ?

此主题相关图片如下：qq图片20150604003000.png