Comments on: MVC CAPTCHA for Preview Release 3

By: JoostS

JoostS — Tue, 18 Nov 2008 10:33:21 +0000

Nick,

Thanks for your reply in your mail, it’s working now. I had some problems with implementing it in vb.net.

By: JoostS

JoostS — Mon, 17 Nov 2008 11:08:16 +0000

Hi,

I’m trying this captcha module into my ASP.NET MVC (beta) application, but I can’t get it to work. I think it has to do with the beta release of MVC. I get the error CaptchaImage is not a member of System.Web.Mvc.HtmlHelper.

Do I need to modify anything?

Thanks in advance

By: Noah

Noah — Tue, 28 Oct 2008 17:01:18 +0000

Thanks for the great work, this is very helpful. I recently used this and made some modifications you might find useful including:

1) Modifying CaptchaTextBox to allow for custom html attributes (such as defining the CSS class)
2) Modifying CaptchaValidationAttribute to automatically invalidate my model (instead of set a captchaValid value)

Details are at http://noahblu.wordpress.com/2008/10/28/aspnet-mvc-captcha/

Noah

By: Bookmarks about Captcha

Bookmarks about Captcha — Wed, 20 Aug 2008 00:30:31 +0000

[...] - bookmarked by 2 members originally found by emosk8 on 2008-08-07 MVC CAPTCHA for Preview Release 3 http://www.coderjournal.com/2008/06/mvc-captcha-for-preview-release-3/ - bookmarked by 3 members [...]

By: Dan Swatik

Dan Swatik — Fri, 11 Jul 2008 13:29:07 +0000

hmm either I forgot or it got cut off

By: Dan Swatik

Dan Swatik — Fri, 11 Jul 2008 13:27:57 +0000

Actually got it working
You have to declare the captchaValid as a nullable parameter like so

[CaptchaValidation("captcha")]
public void Register(bool? captchaValid, string otherParameters)
{
// do stuff
}

also in the web config make sure to declare it like this
Not the dot Mvc

whats listed in the blog post must be dated.. and was changed at some point.

By: Dan Swatik

Dan Swatik — Fri, 11 Jul 2008 01:55:48 +0000

Thanks Nick
I actually did get it to work …well at least to display

now I get this
A value is required for parameter ‘captchaValid’ in action ‘Register’. The parameter either has no value or its value could not be converted. To make a parameter optional its type should either be a reference type or a Nullable type.

I gather it has something to do with the OnActionExecuting filter thingy… where in tarnation do I place that code in my project?

By: Nick Berardi

Nick Berardi — Fri, 11 Jul 2008 01:32:25 +0000

That is because you action is probably picking it up. put a constraint on your action and controller. to check for periods. “[^\\.]*” works really well.

By: Dan Swatik

Dan Swatik — Thu, 10 Jul 2008 21:56:31 +0000

Nick do you have a working web site with this?

I can not seem to make it work… I’m not sure if this is because I am using the MVC Membership Starter Kit or what…

But it doesn’t seem to want to spit out the image instead I get a error from the MVC assembly stating that it can’t find the controller for captcha.ashx

Please help..thanks

By: ASP.NET MVC CAPTCHA - Nick Berardi’s Coder Journal

ASP.NET MVC CAPTCHA - Nick Berardi’s Coder Journal — Wed, 02 Jul 2008 18:14:00 +0000

[...] Most recent update for MVC Release Candidate 3 is [...]