Problem recognizing html helpers in asp.net mvc 3 razor

Question

This is what my Html helper looks like:

namespace WebApp.WebUI
{
    public static class HtmlExtensions
    {

            public static MvcHtmlString GenerateCaptcha(this HtmlHelper helper, string theme)
            {
                string publicKey = ConfigurationManager.AppSettings["CaptchaKey_Public"];
                string privateKey = ConfigurationManager.AppSettings["CaptchaKey_Private"];
                var captchaControl = new Recaptcha.RecaptchaControl
                        {
                            ID = "recaptcha",
                            Theme = theme,
                            PublicKey = publicKey,
                            PrivateKey = privateKey
                        };

                var htmlWriter = new HtmlTextWriter(new StringWriter());

                captchaControl.RenderControl(htmlWriter);

                return new MvcHtmlString(htmlWriter.InnerWriter.ToString());
            }

     }
}

I tried using it in this view:

    @{
        ViewBag.Title = "Register";
    }
    @model WebApp.WebUI.ViewModel.RegisterModel

    @using (Html.BeginForm("Register", "Auth", FormMethod.Post, new { Id = "ERForm" }))
    {
        @Html.GenerateCaptcha("clean")   
    }

It gives me this error:

CS1061: 'System.Web.Mvc.HtmlHelper<WebApp.WebUI.ViewModel.RegisterModel>' does not contain a definition for 'GenerateCaptcha' and no extension method 'GenerateCaptcha' accepting a first argument of type 'System.Web.Mvc.HtmlHelper<WebApp.WebUI.ViewModel.RegisterModel>' could be found (are you missing a using directive or an assembly reference?)

What am I doing wrong. My namespaces are correct. It does not show up in the intellisense for @Html

Darin Dimitrov · Accepted Answer · 2011-04-27 18:34:59Z

17

You could add:

@using WebApp.WebUI

on the top of your Razor view.

And if you want to reuse this helper among many different views to avoid adding the using clause everytime you could add it to the <namespaces> section of the ~/Views/web.config file:

<system.web.webPages.razor>
    <host factoryType="System.Web.Mvc.MvcWebRazorHostFactory, System.Web.Mvc, Version=3.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" />
    <pages pageBaseType="System.Web.Mvc.WebViewPage">
        <namespaces>
            <add namespace="System.Web.Mvc" />
            <add namespace="System.Web.Mvc.Ajax" />
            <add namespace="System.Web.Mvc.Html" />
            <add namespace="System.Web.Routing" />
            <add namespace="WebApp.WebUI" />
        </namespaces>
    </pages>
</system.web.webPages.razor>

After doing this make sure you recompile and reopen the Razor view for the Intellisense to have time to pick it up.

answered Apr 27, 2011 at 18:34

Darin Dimitrov

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2 Comments

Shawn Mclean Over a year ago

I'm supposed to be able to add the namespace in the <pages><namespaces> and not use @using WebApp.WebUI right?

genxgeek Over a year ago

Did you every have any luck getting this to work without the using directive locally in the razor view? That works for me but but I still can't get it to work globally (without the @using and just the @Html.<TheHelper>).

Wizact · Accepted Answer · 2012-06-11 04:32:04Z

1

Like Darin said but, in order to use it globally, you probably need to add it to both ~/Views/web.config and ~/web.config section.

answered Jun 11, 2012 at 4:32

Wizact

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bummi · Accepted Answer · 2014-12-17 23:14:38Z

1

To make html helpers work globally, follow Darin Dimitrov's answer. Once that's done, close the .cshtml view and reopen it, the intellisense starts working.

Reference: Razor - mvc 3 - Namespace to web.config works but intellisense does not recognize extension

edited Dec 17, 2014 at 23:14

bummi

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answered Dec 17, 2014 at 23:10

Vijayanand Settin

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Comments

Web Devvy · Accepted Answer · 2018-12-11 22:44:22Z

0

For me I was using Nopcommerce and had to add the using statement @using Nop.Web.Framework.Security.Captcha

answered Dec 11, 2018 at 22:44

Web Devvy

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