无法绑定到数据网格？

Question

   <mesh:SecurePanel runat="server" ID="retentionInvoiceDue" WebMasters="true" Admins="true" style="text-align:left; font-size:small;">
            <a class="alert" ID="a1">Alerts</a>
            <br>
            <asp:Panel ID="panelToPromptRetentionInvoiceDue" runat="server" 
                CssClass="retentionLinksOnHomePage" Visible="true">
                <asp:DataGrid ID="datagridToPromptRetentionInvoiceDue" runat="server" 
                    AutoGenerateColumns="false" GridLines="None" ShowHeader="false">
                    <Columns>
                        <asp:TemplateColumn>
                            <ItemTemplate>
                                <span>Site
                                    <asp:LinkButton ID="promptRententionInvoiceLink" CommandArgument='<%# Bind ("id") %>' OnCommand="getSessionVariableForWorkSiteID" runat="server">
                                        <asp:Label id="labelBindfromHomeToInvoice" runat="server" Text="<%# Bind('Site_Name') %>"/>
                                    </asp:LinkButton>retention due for invoicing 
                                </span>
                            </ItemTemplate>
                        </asp:TemplateColumn>
                    </Columns>
                </asp:DataGrid>
             </asp:Panel>
    </mesh:SecurePanel>

在页面加载中的cs文件中：

  Context db = new Context();

        var allWorkSites =
            (from worksites in db.Work_Sites
             select worksites).Distinct().ToList();

        List<Object> chosenInvoicesForRetention = new List<Object>();

        foreach (Work_Site worksite in allWorkSites)
        {
            if (!worksite.Invoicing_Complete)
            {
                Invoice lastInvoice = worksite.Invoices.OrderBy(w => w.id).LastOrDefault();

                if (lastInvoice != null)
                {
                    if (lastInvoice.Invoice_Date < DateTime.Now.AddMonths(0 - worksite.Number_of_Months))
                    {
                        chosenInvoicesForRetention.Add(worksite);
                    }
                }

            }
        }

        if (chosenInvoicesForRetention.Count == 0)
        {
            panelToPromptRetentionInvoiceDue.Visible = false;
        }

        else
        {
            datagridToPromptRetentionInvoiceDue.DataSource = chosenInvoicesForRetention;
            datagridToPromptRetentionInvoiceDue.DataBind();
        }

    }

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为什么我会收到错误消息： panelToPromptRetentionInvoiceDue & datagridToPromptRetentionInvoiceDue 不存在？？

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编辑： 我应该提一下，这段代码在我项目的不同页面上运行良好，我只是将它复制过来，因为我想再次使用它，但是更改它正在链接的表......为什么它会从一页而不是另一个？

还删除了安全面板，但仍然不起作用

有人有什么想法吗？将不胜感激

Answer 1

我假设您需要使用 FindControl 来引用 SecurePanel 中的任何控件。

尝试将以下内容放在代码隐藏中引用它们的位置上方。

var datagridToPromptRetentionInvoiceDue = 
    (DataGrid)retentionInvoiceDue.FindControl("datagridToPromptRetentionInvoiceDue");

var panelToPromptRetentionInvoiceDue =
    (Panel)retentionInvoiceDue.FindControl("panelToPromptRetentionInvoiceDue");