Comments on: Using Control Adapters to automatically attach AJAX Extenders to ASP.NET Controls

By: Nitin Reddy Katkam

Nitin Reddy Katkam — Wed, 25 Jun 2008 04:43:06 +0000

@Jason

Hi!

The “Server could not create *Adapter” error results from your class being inaccessible – ensure that you have the “public” keyword before the class declaration and have specified the correct namespace and class name.

-Nitin

By: dbenn

dbenn — Fri, 01 Jun 2007 15:52:57 +0000

Is there a way to disable the loading of the control adapters? I found that I could prevent ‘adaptation’ for your custom control by returning null from Control.ResolveAdapter in the ASP.Net Quickstart Toolkit, but I cant figure out how to do it.

By: Rob

Rob — Thu, 24 May 2007 07:39:53 +0000

This is a very good solution, but it doesn’t work with DropDownLists because with a DropDownList, you aren’t allowed to add any controls to the Controls collection. There is a way around that, however, but that requires that you override the CreateControlCollection of the DropDownList. This would mean creating a custom control to do this, and using the Adapter with the custom control. Because of this, you would have to go through all your existing code to update instances of DropDownList with your custom DropDownList. Is there an easier way?

By: Adam Rogas

Adam Rogas — Tue, 17 Apr 2007 16:51:04 +0000

Wouldn’t it be possible to inject the Script Manager at the CreateChildControls level of your adapter.

ala

if(ScriptManager.GetCurrent(this.Control.Page) == null)
{
this.Control.Page.Form.Control.Add(new ScriptManager())
}

By: dmehers

dmehers — Wed, 28 Feb 2007 07:27:28 +0000

I’ve finally loaded a demo project which you can find here: http://damianblog.com/2007/02/28/adapters-extenders-demo/

By: Patrik Nordberg

Patrik Nordberg — Mon, 22 Jan 2007 18:49:59 +0000

Hey, to begin with nice article!

I’m creating a new control á la Container Panel where I want to use the CollapsiblePanel extender. But I’m having trouble including it since I get this error: “Extender controls may not be registered before PreRender”.

If you could evolve on how to include an extender in a custom control it would be deeply appreciated.

Best regards

Patrik Nordberg

By: Jason

Jason — Fri, 22 Dec 2006 14:34:17 +0000

Thank you, Damian. I didn’t get your email yet though. You could send me email to gmail box if you like. Thanks agian.

Merry Christmas!

Jason

By: Damian

Damian — Thu, 21 Dec 2006 20:41:48 +0000

Hello Jason,

Can you ZIP up your project and email it to me and I’ll take a look. I’ve sent you a separate email with my email address.

Thanks,
Damian

By: Jason

Jason — Thu, 21 Dec 2006 15:45:14 +0000

BTW, I changed ASP.NET AJAX 1.0 Beta to ASP.NET AJAX 1.0 RC.

By: Jason

Jason — Thu, 21 Dec 2006 15:38:18 +0000

I created project step by step according to your article. However, when I ran the website I got the error like:

Server could not create ListSearch.ListBoxAdapter.

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.Exception: Server could not create ListSearch.ListBoxAdapter.

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:

[Exception: Server could not create ListSearch.ListBoxAdapter.]
System.Web.Configuration.HttpCapabilitiesBase.GetAdapterFactory(Type adapterType) +442
System.Web.Configuration.HttpCapabilitiesBase.GetAdapter(Control control) +629
System.Web.UI.Control.ResolveAdapter() +136
System.Web.UI.Control.InitRecursive(Control namingContainer) +50
System.Web.UI.Control.InitRecursive(Control namingContainer) +271
System.Web.UI.Control.InitRecursive(Control namingContainer) +271
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1744

How can I fix it? Thanks.