Accessing HtmlHelper methods within HtmlHelper extension method - ASP.NET MVC RC2

Question

I am trying to build an HtmlHelper extension in ASP.NET MVC RC2. This code worked fine in Preview 5, but does not work anymore in RC2 and I am trying to understand why. Here is the code:

public static string EmptyDropDownList(this HtmlHelper htmlHelper, string name, object htmlAttributes)
{
    return htmlHelper.DropDownList(name, new SelectList(new string[0]), htmlAttributes);
}

The problem is that I am unable to access all the methods on htmlHelper from within the extension method. Thus, htmlHelper.DropDownList cannot be found.

Any suggestions?

tvanfosson · Accepted Answer · 2009-03-16 21:35:43Z

11

You need to include the System.Web.Mvc.Html namespace since most of the HtmlHelper methods are really extensions defined in classes in that namespace.

You can find the RC1 (and, presumably, soon the RC2 source code, too) at www.codeplex.com/aspnet. Click on the source code tab and navigate down to the MVC source code tree.

answered Mar 16, 2009 at 21:35

tvanfosson

534k102 gold badges703 silver badges801 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Tom Stickel Over a year ago

For MVC3, using System.Web.Mvc; is the namespace I used for extensions methods for Html.LaborFor System.Web.Mvc.Html is already in the inner web.config file really zero sense in using in when modding a helper, just use using System.Web.Mvc; and setup your web.config to be "aware" of your namespace with the extension method, thus see my answer below.

Tom Stickel · Accepted Answer · 2012-02-13 23:24:49Z

0

Two choices:

a. Add to page with "Using" thus with razor view page (mvc 3 and mvc 4) e.g.

    @using UrWeb.Helpers

OR

b. Add to the inner web.config namespaces section e.g.

    <add namespace="UrWeb.Helpers"/>

answered Feb 13, 2012 at 23:24

Tom Stickel

20.6k7 gold badges117 silver badges117 bronze badges

Collectives™ on Stack Overflow

Accessing HtmlHelper methods within HtmlHelper extension method - ASP.NET MVC RC2

2 Answers 2

1 Comment

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Related