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[Solved] You cannot call render more than once

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PanelBar

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Jim asked on 28 Jan 2010, 01:18 AM

This is a bit dificult to explain and involves both the panel bar and tab control. I have an action link in a panel bar control that loads a view into the main content placeholder of a master page. The view has a tab control on it. One tab is to load a partial view into the tab content area, but whenever I run the application I get an InvalidOperationException that says "You cannot call render more than once". The error appears here

    
                <%   
        
                Html.Telerik().StyleSheetRegistrar()  
        
                    .DefaultGroup(group => group.Add("telerik.common.css")  
        
                                                .Add("telerik.black.css"))  
        
                    .Render()  
        
                ;   
        
                %>

The code that causes the error is:

    
            <asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">  
        
                <% Html.RenderPartial("BlogEntries"); %> 
        
            </asp:Content>

Can you explain this or help me fix it?

Thanks,
Jim

4 Answers, 1 is accepted

answered on 29 Jan 2010, 09:51 AM

I have exactly same error (You cannot call render more than once) on my Master page. I am trying to implement PanelBar as my navigation control. I have been banging my head to the wall, maybe someone has an idea how to fix this? :)

Here is my master page. Problem occurs when I use RenderPartial("Navigation");

    
            <head runat="server">  
        
                <title><asp:ContentPlaceHolder ID="TitleContent" runat="server" /></title>  
        
                <link href="../../Content/Site.css" rel="stylesheet" type="text/css" /> 
        
                <%   
        
                    Html.Telerik().StyleSheetRegistrar()  
        
                        .DefaultGroup(group => group.Add("telerik.common.css")  
        
                                                    .Add("telerik.vista.css"))  
        
                        .Render();   
        
                %>      
        
            </head> 
        
            <body> 
        
                <div class="page">  
        
                    <form id="navigationForm" runat="server">  
        
                        <div id="container">  
        
                            <div id="top">  
        
                                <div id="logindisplay">  
        
                                    <% Html.RenderPartial("LoginStatus"); %> 
        
                                </div>                       
        
                            </div> 
        
                            <div id="leftnav">  
        
                                <% Html.RenderPartial("Navigation"); %> 
        
                                <asp:ContentPlaceHolder ID="NavigationContent" runat="server" /> 
        
                            </div> 
        
                            <div id="content">  
        
                                <asp:ContentPlaceHolder ID="MainContent" runat="server" /> 
        
                             </div> 
        
                            <div id="footer">  
        
                            </div> 
        
                        </div>          
        
                    </form> 
        
                </div> 
        
                <%= Html.Telerik().ScriptRegistrar() %> 
        
            </body> 
        
            </html>

Navigation.aspx (I tried also without .Render(); but no luck)

    
            <%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage" %> 
        
            <asp:Content ID="Navigation" ContentPlaceHolderID="NavigationContent" runat="server">  
        
                <%   
        
                    Html.Telerik().PanelBar()  
        
                        .Name("PanelBar")  
        
                        .Items(items => 
        
                        {  
        
                            items.Add().Text("Item 1");  
        
                            items.Add().Text("Item 2");  
        
                        })  
        
                        .Render();  
        
                %> 
        
            </asp:Content>

NavigationController

    
            namespace ParKone.Controllers  
        
            {  
        
                public class NavigationController : Controller  
        
                {  
        
                    //  
        
                    // GET: /Navigation/  
        
                    public ActionResult Index()  
        
                    {  
        
                        return View();  
        
                    }  
        
                }  
        
            }