Error with asp:Repeater in MasterPage template

Posted by Community Admin on 31-Mar-2011 00:00

I have a MasterPage template that uses an aspnet Repeater control. This works fine when viewing the page directly; however, when editting the page in Sitefinity, I get the following error:

Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control.

Here is the markup:

<body>

<form id="form1" runat="server">

<asp:ScriptManager ID="ScriptManager1" runat="server" />

<div>

<asp:Repeater ID="ItemRepeater" runat="server">

<HeaderTemplate>

<ul>

</HeaderTemplate>

<ItemTemplate>

<li class="Item"><a href="<%# Eval("Url") %>"><%# Eval("Title") %></a></li>

</ItemTemplate>

<FooterTemplate>

</ul>

</FooterTemplate>

</asp:Repeater>

</div>

<div id="contentwindow">

<div id="Content">

<div id="ContentBlockMain">

<asp:ContentPlaceHolder ID="ContentBlock" runat="server" />

</div>

The ItemRepeater.DataBind() is being invoked in Page_Load() of the MasterPage.

Any idea what could be causing this? Is there a workaround, or from the MasterPage codebehind, can I detect if the page is being displayed through Sitefinity and act accordingly?

Thanks,
-Chris B.

Posted by Community Admin on 05-Apr-2011 00:00

Hello Chris Bryant,

There are control extensions - ControlExtensions

IsDesignMode - static method which determines whether the control is in Sitefinity design mode - you are editing a page. There are also

IsPreviewMode- determines whether the control is in Sitefinity preview mode.

IsBackend -determines whether a control instance is in backend.

sample

protected override void OnPreRender(EventArgs e)

base.OnPreRender(e);

if (this.IsDesignMode() && !this.IsPreviewMode())

this.Controls.Clear();

You can use one of the methods below to disable the control binding/rendering and suppress the error you are getting.

Kind regards,
Ivan Dimitrov
the Telerik team

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Databinding methods such as Eval(), XPath(), and Bind() can only be used in the context of a databound control.