Question

以下代码允许用户根据需要向gridview添加任意数量的文本框行。

我们决定将用户动态添加的行数限制为仅为6。

我已经在网上搜索了如何完成此操作的样本无效。

有没有人知道下面的代码需要更改哪些内容，以便用户只能添加最多6行但不超过6行的新行？

提前多多感谢

    Private Sub AddNewRow()
    Dim rowIndex As Integer = 0

    If ViewState("CurrentTable") IsNot Nothing Then
        Dim dtCurrentTable As DataTable = DirectCast(ViewState("CurrentTable"), DataTable)
        Dim drCurrentRow As DataRow = Nothing
        If dtCurrentTable.Rows.Count > 0 Then
            For i As Integer = 1 To dtCurrentTable.Rows.Count
                Dim TextRefillNumber As TextBox = DirectCast(grvStudentDetails.Rows(rowIndex).Cells(1).FindControl("txtRefillNumber"), TextBox)
                drCurrentRow = dtCurrentTable.NewRow()
                drCurrentRow("RowNumber") = i + 1

                dtCurrentTable.Rows(i - 1)("Col1") = TextRefillNumber.Text

                rowIndex += 1
            Next
            dtCurrentTable.Rows.Add(drCurrentRow)
            ViewState("CurrentTable") = dtCurrentTable

            grvStudentDetails.DataSource = dtCurrentTable
            grvStudentDetails.DataBind()

            Dim txn As TextBox = DirectCast(grvStudentDetails.Rows(rowIndex).Cells(1).FindControl("txtRefillNumber"), TextBox)
            ' txn.Focus;
            txn.Focus()
        End If
    Else
        Response.Write("ViewState is null")
    End If
    SetPreviousData()
End Sub
Private Sub SetPreviousData()
    Dim rowIndex As Integer = 0
    If ViewState("CurrentTable") IsNot Nothing Then
        Dim dt As DataTable = DirectCast(ViewState("CurrentTable"), DataTable)
        If dt.Rows.Count > 0 Then
            For i As Integer = 0 To dt.Rows.Count - 1
                Dim TextRefillNumber As TextBox = DirectCast(grvStudentDetails.Rows(rowIndex).Cells(1).FindControl("txtRefillNumber"), TextBox)
                ' drCurrentRow["RowNumber"] = i + 1;

                grvStudentDetails.Rows(i).Cells(0).Text = Convert.ToString(i + 1)
                TextRefillNumber.Text = dt.Rows(i)("Col1").ToString()
                rowIndex += 1
            Next
        End If
    End If
End Sub
Protected Sub ButtonAdd_Click(ByVal sender As Object, ByVal e As EventArgs)
    AddNewRow()
End Sub

注意：我添加了C＃标签，因为我可以从C＃转换为VB.net

Answer 1

你应该有一个行的计数器。当用户添加一行时，计数器将增加。如果用户在counter >= limit不允许时尝试添加行。

您应该拥有UserAddRow和UserRemoveRow方法照顾柜台的增加和减少。这会改善readability和maintainability。

如何向gridview动态添加指定数量的文本框？

1 个答案: