单击按钮时 ModalPopupExtender 丢失动态添加的 table 行

Question

VS 2013, ASP.NET 3.5 VB.NET

页面有多个用于不同弹出窗口的 ModalPopupExtender 控件。其中一个弹出窗口用 CheckBoxControls 和追加销售项目的描述填充 table。

页面代码：

<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="ajax" %>
    [snip]
    <ajax:ModalPopupExtender 
            runat="server" 
            ID="mpeUpsell"
            popupControlID="pUpsell" 
            CancelControlID="bGoBack" 
            BackgroundCssClass="custBackground" 
            PopupDragHandleControlID="phDragUpsell"
            TargetControlID="bHidden" 
            Enabled="True"  />
        <asp:Panel runat="server" ID="pUpsell" style="display:none;">
            <div runat="server" class="custPopup">
                <div runat="server" id="phDragUpsell">
                    <h3 style="text-align:center;">
                        <asp:Label 
                            ID="lUpsellHdr" 
                            runat="server"
                            Text="Check Out these Add-Ons" />
                    </h3>
                </div>
                <asp:Label 
                    ID="lAddOnsText" 
                    runat="server" />
[snip]
                <asp:Table 
                    ID="tItems" 
                    runat="server"
                    style="border: 1px solid black;">
[snip]                            <asp:Button ID="bNext" runat="server" Text="Next ---&gt;" />
                        </td>
                    </tr>
                </table>
                <br />
                <br />
            </div>
        </asp:Panel>

table tItems 的填充方式如下：

                    For Each dr As DataRow In ds.Tables(0).Rows
                        tr = New TableRow()
                        tc = New TableCell()
                        Dim sName As String = "cbItem_" & CInt(dr("ITEM_ID"))
                        Dim cb As New CheckBox()
                        cb.ID = sName
                        cb.Text = dr("ITEM_DESC").ToString.Trim
                        If CInt(dr("UGICheckOFF")) = 1 Then
                            cb.Checked = True
                        Else
                            cb.Checked = False
                        End If
                        [snip formatting]
                        tc.Controls.Add(cb)
                        tr.Cells.Add(tc)
                        tc2 = New TableCell()
                        Dim sPrice As String = String.Format("{0:C}", dr("ITEM_PRICE"))
                        tc2.Text = sPrice
                        [snip formatting]
                        tr.Cells.Add(tc2)
                        tItems.Rows.Add(tr)
                    Next

当我使用代码隐藏显示 mpeUpsell ModalPopupExtender 时，table 完美填充并显示。

bNext 按钮的处理程序如下所示：

Protected Sub bNext_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles bNext.Click
    If iItemArray IsNot Nothing Then iItemArray = Nothing ' get rid of it
    ' Handle the Next Button
    Dim iCartID As Integer = -1
    iCartID = CInt(Session("CartID"))
    ' iterate the items and add each to cart if not already in cart
    iItemArray = New ArrayList()
    For Each tr As TableRow In tItems.Rows
        For Each tc As TableCell In tr.Cells
            For Each ctl As Control In tc.Controls
                If TypeOf (ctl) Is CheckBox Then
                    Dim cb As CheckBox = CType(ctl, CheckBox)
                    If cb.Checked Then
                        'if there are checks create array of item IDs checked.
                        Dim itemid As Integer = CInt(cb.ID.Replace("cbItem_", ""))
                        iItemArray.Add(itemid)
                    End If
                End If
            Next
        Next
    Next
[snip]
End Sub

执行处理程序时，tItems.Rows.Count 为零并且 ForEach 简单地失败，因为 table 行已经消失。

很明显我漏掉了什么；我只是不知道我错过了什么。

谢谢，约翰.

Answer 1

解决方案是放弃 asp table，因为在这种情况下它不是有状态的。相反，我使用了 gridview 并将数据table绑定到它，并且能够检索值。

谢谢。

单击按钮时 ModalPopupExtender 丢失动态添加的 table 行

ModalPopupExtender loses dynamically-added table rows on button click

asp.net

vb.net

ajaxcontroltoolkit