Question

我现在负责一个ASP.net VB Web表单应用程序，我需要对其进行更改。我对asp.net没有多少经验，所以如果我没有正确的流程，请告诉我。我试图隐藏两个表行，具体取决于转发器内嵌套表内的用户权限 - 但TR的ID不会出现在设计器中，如果我手动添加它们，他们就不会这样做。在VS删除之前，请停留很长时间。在后面的代码中，我为这两个ID收到了is not declared个错误

<table>
    <asp:repeater ID="history" runat="server" OnItemDataBound="historyDetails">
        <itemTemplate>
            <tr>
                <td>
                    <table>
                        <%-- 
                        I'm trying to hide these 2 rows conditionally
                        without using <% if isAdmin then %> <% end if %> 
                        --%>
                        <tr id = "adminHeading" runat="server">
                            <td>...</td>
                        </tr>
                        <tr id = "adminNav" runat="server">
                            <td>...</td>
                        </tr>
                        <tr>...</tr>
                    </table>
                </td>
            </tr>
        </itemTemplate>
    </asp:repeater>
</table>

背后的代码

Protected Sub historyDetails(ByVal sender As Object)
    ...
    ...
    If session("isAdmin") Then
        adminHeading.visible = True 'produces not declared error
        adminNav.visible = True 'produces not declared error
    End If
End Sub

Answer 1

您无法访问adminHeading＆amp;的原因您的代码中的adminNav是因为它们不直接存在于您的表单标记中，而是存在于转发器控件中。您可以通过查找这些表行来完成ItemDataBound事件： -

Protected Sub historyDetails(sender As Object, e As RepeaterItemEventArgs)
   If (e.Item.ItemType = ListItemType.AlternatingItem Or _
       e.Item.ItemType = ListItemType.Item) Then
         Dim adminHeading As HtmlTableRow = TryCast(e.Item.FindControl("adminHeading"), _
                                                    HtmlTableRow)
         Dim adminNavAs HtmlTableRow = TryCast(e.Item.FindControl("adminNav"), _
                                                    HtmlTableRow)
     'Check your condition and hide the rows
     If session("isAdmin") Then
         adminHeading.Visible = False
         adminNavAs.Visible = False
     End If
   End If
End Sub

htmlTableRow不在设计师中

1 个答案: