Menu control throws NullReferenceException

Posted by Community Admin on 23-Dec-2014 00:00

I've updated from 6.2 to7.3.5610.0. After this update the normal ASP.NET menu control is no longer working. I've created a new empty sitefinity project and created a masterpage with a ASP.NET menu control. This results in the same error.

<%@ Master Language="C#" AutoEventWireup="true" CodeBehind="Site1.master.cs" Inherits="SitefinityWebApp.Site1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">

<title></title>

<asp:ContentPlaceHolder ID="head" runat="server">

</asp:ContentPlaceHolder>

</head>

<body>

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

<div>

<asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server">

<asp:Menu ID="Menu1" runat="server" DataSourceID="SiteMapDataSource1"></asp:Menu>

<asp:SiteMapDataSource ID="SiteMapDataSource1" runat="server" />

</asp:ContentPlaceHolder>

</div>

</form>

</body>

</html>

[NullReferenceException: Object reference not set to an instance of an object.]

System.Web.UI.WebControls.Menu.DataBindRecursive(MenuItem node, IHierarchicalEnumerable enumerable) +1932

System.Web.UI.WebControls.Menu.DataBindItem(MenuItem item) +315

System.Web.UI.WebControls.Menu.PerformDataBinding() +124

System.Web.UI.WebControls.HierarchicalDataBoundControl.PerformSelect() +102

System.Web.UI.WebControls.BaseDataBoundControl.DataBind() +30

System.Web.UI.WebControls.Menu.DataBind() +4

System.Web.UI.WebControls.BaseDataBoundControl.EnsureDataBound() +105

System.Web.UI.WebControls.Menu.EnsureDataBound() +34

System.Web.UI.WebControls.Menu.OnPreRender(EventArgs e) +24

System.Web.UI.Control.PreRenderRecursiveInternal() +83

System.Web.UI.Control.PreRenderRecursiveInternal() +155

System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +974

Posted by Community Admin on 26-Dec-2014 00:00

Hello Bart,

Thank you for contacting us.

I reproduces the issue on Sitefinity 7.3 on my side and verified that in Sitefinity 6.2 the same case was working. However, when I moved the Menu control and the SiteMapDataSource out of the asp:ContentPlaceHolder everything was okay.

<div id="Content">

Menu:

<asp:Menu ID="Menu1" runat="server" RenderingMode="Table"></asp:Menu>

<asp:SiteMapDataSource ID="SiteMapDataSource1" runat="server" />

<asp:ContentPlaceHolder id="Content" runat="server">

</asp:ContentPlaceHolder>

</div>

I am setting the Data Source of the Menu on Page_Load like this:

public partial class Site1 : System.Web.UI.MasterPage

protected void Page_Load(object sender, EventArgs e)

this.SiteMapDataSource1 = new SitefinitySiteMapDataSource();

this.SiteMapDataSource1.Provider = SiteMapBase.GetSiteMapProvider("FrontendSiteMap");

this.SiteMapDataSource1.ShowStartingNode = false;

this.Menu1.DataSource = this.SiteMapDataSource1;

this.Menu1.DataBind();

I will contact our developers after the holidays to check if this behaviour is an intended change or a bug.

Regards,
Kristian Smilenov
Telerik

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Posted by Community Admin on 28-Dec-2014 00:00

Hi Kristian,

Thanks for looking into this. I cannot easily move the menu control outside the contentplaceholder as I'm using nested masterpages.

I'm looking forward to the developer's response.

Regards,

Bart Vanlier

Posted by Community Admin on 11-Jan-2015 00:00

Any news regarding this issue?

Another issue I've got, probably related to this, is when i try to set StartingNodeUrl I get an ArgumentException telling me I'm not allowed to set the relative path "~/Custom/Controls/WebFront/". I've tried several setting several url's but I keep getting this exception.

Posted by Community Admin on 13-Jan-2015 00:00

There seems to be something wrong with my database. When I delete all pages and create new ones, the problem goes away.

Any help would be greatly appreciated as recreating all pages is not really an option.

This thread is closed

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