Question

提供一些背景的小伪代码：

我有一个带占位符和按钮的ASPX
单击该按钮时，会将Web用户控件（uc1）添加到我的占位符
uc有一个按钮
单击时，会向占位符

单步执行代码，如果我在＃4按钮单击之前和之后查看placeholder.controls.count，则计数会增加1，如您所料。

问题是＃4中添加的uc2没有出现在屏幕上。所以，我将占位符包装在UpdatePanel中。我以前从未使用过。所以，我可以在添加uc2之后刷新占位符。

相关的ASPX代码

<ajaxToolkit:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server></ajaxToolkit:ToolkitScriptManager>
    <ajaxToolkit:TabContainer ID="tcNavigation" runat="server" ActiveTabIndex="0">
    <ajaxToolkit:TabPanel ID="tpWebMerchandising" runat="server" HeaderText="WEB">
                    <ContentTemplate>
                        <table cellpadding="3" cellspacing="0" border="0">
                            <tr>
                                <td valign="top" class="label">Attributes</td>
                                <td>
                                    <asp:UpdatePanel runat="server" id="UpdatePanel1" updatemode="Conditional">
                                        <ContentTemplate>
                                            <asp:PlaceHolder ID="phAttributes" runat="server"></asp:PlaceHolder><br />
                                        </ContentTemplate>
                                    </asp:UpdatePanel>

                                    <asp:Button ID="btnAddAttribute" runat="server" Text="Add Attribute" /> | <asp:Button ID="btnCreateAttribute" runat="server" Text="Create Attribute" />
                                </td>
                            </tr>
                        </table>
                    </ContentTemplate>
                </ajaxToolkit:TabPanel>
            </ajaxToolkit:TabContainer>

相关的ASCX代码

For Each ctrl As Control In Parent.Page.Controls
               For Each ctrl2 As Control In ctrl.Controls
                    For Each ctrl3 As Control In ctrl2.Controls
                         For Each ctrl4 As Control In ctrl3.Controls
                              For Each ctrl5 As Control In ctrl4.Controls
                                   If InStr(ctrl5.GetType.ToString(), "UpdatePanel") > 0 Then 'UPDATE PANEL
                                        up = ctrl5
                                   End If
                                   For Each ctrl6 As Control In ctrl5.Controls 'CONTENT TEMPLATE
                                        For Each ctrl7 As Control In ctrl6.Controls 'PLACE HOLDER
                                             If ctrl7.GetType.ToString() = "System.Web.UI.WebControls.PlaceHolder" Then
                                                  phAttributes = ctrl7
                                             End If
                                        Next
                                   Next
                              Next
                         Next
                    Next
               Next
          Next

Dim ctrlAttributes As New AttributeControl
ctrlAttributes.AttributeName = attrName
ctrlAttributes.AttributeValue = attrValue
ctrlAttributes.ID = "ctrlAttribute-" & attrName
phAttributes.Controls.Add(ctrlAttributes)

我试过了......

up.Update()

这......

Me.Page.RegisterStartupScript("AutoPostBackScript", "__doPostBack('UpdatePanel1', '');")

目标是刷新占位符，以便在屏幕上显示新的ctrlAttributes。

Answer 1

首先，使用Parent.FindControl而不是这个混乱的foreach-es。

占位符在UpdatePanel中

1 个答案: