Posted by Community Admin on 27-Oct-2011 00:00

I'm building a custom layout control and have it working just fine except i'm getting an error when I drop more than 1 content block into a placeholder.

I suspect I need to override something in my CustomControl to assign something a unique name, but not sure what.

My Custom Control code:

01.public class WebCustomControl1 : LayoutControl

02.

03. /// <summary>

04. /// CustomTemplate lets you supply a template.ascx file to render the layout.

05. /// </summary>

06. public string CustomTemplate = "SitefinityWebApp.LayoutControls.Layout1.ascx";

07.

08. public override string Layout

09.

10. get return this.CustomTemplate;

11. set CustomTemplate = value;

12.

13.

14. public override string AssemblyInfo

15.

16. get return GetType().ToString();

17. set base.AssemblyInfo = value;

18.

19.

20. protected override void CreateChildControls()

21.

22. base.CreateChildControls();

23.

24.

My ASCX file:

<%@ Control Language="C#" %>

<div class="trio first">

<div id="div1" runat="server" class="sf_cols">

<div id="div2" runat="server" class="sf_colsOut">

<div id="div3" runat="server" class="sf_colsIn">

</div>

<div class="trio">

<div id="Div4" runat="server" class="sf_cols">

<div id="div5" runat="server" class="sf_colsOut">

<div id="div6" runat="server" class="sf_colsIn">

</div>

<div class="trio last">

<div id="Div7" runat="server" class="sf_cols">

<div id="div8" runat="server" class="sf_colsOut">

<div id="div9" runat="server" class="sf_colsIn">

</div>

Error is:

Server Error in '/' Application.

An item with the same key has already been added.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.ArgumentException: An item with the same key has already been added.

Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace:


            [ArgumentException: An item with the same key has already been added.]
   System.ThrowHelper.ThrowArgumentException(ExceptionResource resource) +52
   System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add) +9375087
   System.Collections.ObjectModel.KeyedCollection`2.AddKey(TKey key, TItem item) +70
   System.Collections.ObjectModel.KeyedCollection`2.InsertItem(Int32 index, TItem item) +38
   System.Collections.ObjectModel.Collection`1.Add(T item) +98
   Telerik.Sitefinity.Web.UI.PlaceHoldersCollection.AddRange(IEnumerable`1 controls) +77
   Telerik.Sitefinity.Modules.Pages.PageHelper.CreateChildControls(IList`1 controls, Page page, Boolean ignoreCultures) +957
   Telerik.Sitefinity.Modules.Pages.DraftProxyBase.CreateChildControls(Page page) +327
   Telerik.Sitefinity.Modules.Pages.TemplateEditorRouteHandler.ApplyLayoutsAndControls(Page page, RequestContext requestContext) +226
   Telerik.Sitefinity.Web.RouteHandler.InitializeContent(Page handler, RequestContext requestContext) +53
   Telerik.Sitefinity.Web.RouteHandler.Handler_Load(Object sender, EventArgs e) +214
   System.Web.UI.Control.OnLoad(EventArgs e) +91
   System.Web.UI.Control.LoadRecursive() +74
   System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +2207

Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.468

Posted by Community Admin on 28-Oct-2011 00:00

A rebuild of the project and restart of Sitefinity resolved this.

This thread is closed

Layout Custom Control - receiving error w/ multiple content

All Replies

Server Error in '/' Application.

An item with the same key has already been added.