Dim dlg As new OpenFileDialog
dlg.Filter = "文本文件|*.txt"
Tables("表A").StopRedraw
If dlg.ShowDialog = DialogResult.OK Then
    Dim strs As String = FileSys.ReadAllText(dlg.FileName)
    strs = strs.Replace(vblf,"")
    Dim rs() As String = strs.Split(vbcr)
    For i As Integer = 0 To rs.Length - 1
        Dim cs() As String = rs(i).Split(",")
        If cs.Length = 7 Then
            Dim dr As DataRow = DataTables("表A").Find("第一列 = \'" & cs(0) & "\'")
            If dr Is Nothing Then
                dr = DataTables("表A").Addnew()
            End If
            dr("第一列") = cs(0)
            dr("第二列") = cs(1)
            dr("第三列") = cs(2)
        End If
    Next
End If
Tables("表A").ResumeRedraw