CODEWITHSUNDEEP
asp.net-mvc-3razor
Malcolm
Malcolm

Reputation: 12864

Custom html helpers dont work in MVC3

I have just installed MVC3 and VS 2010 express.

Writing my first app in MVC3 but not my first MVC app.

I have written a custom html helper like so

namespace MyNamespace.Web.Helpers
{

    public static class HtmlExtensions
    {
        public static string RenderHeaderImages(this HtmlHelper html)
        {
            StringBuilder bldr = new StringBuilder();
            List<string> files = (List<string>)HttpContext.Current.Application["HeaderImages"];

            bldr.AppendLine("<table><tr>");
            foreach (string file in files)
            {
                bldr.AppendLine(string.Format("<td><img class=\"headerImage\" src=\"{0}/Content/Images/Header/{1}\", alt=\"{2}\" /></td>"
                    , HtmlExtensions.GetAppPath(""),  file, file));
            }
            bldr.AppendLine("</table></tr>");

            return bldr.ToString();
        }

        public static string GetAppPath(this HtmlHelper html)
        {
            return HtmlExtensions.GetAppPath("");
        }

        public static string GetAppPath(this HtmlHelper html, string arg)
        {
            return HtmlExtensions.GetAppPath(arg);
        }

        public static string GetAppPath(string arg)
        {
            if (HttpContext.Current.Request.ApplicationPath.ToString() == @"/")
                return "http://localhost:50194" + arg;
            else
                return HttpContext.Current.Request.ApplicationPath.ToString() + arg;
        }
    }
}

Then I tried adding "using" to my razor view and also adding namepsace to the views/webconfig file.

@using MyNamespace.Web.Helpers

<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="MyNamespace.Web.Helpers"/>
  </namespaces>
</pages>
</system.web.webPages.razor>

But still the helper does not work.

And it does not come up in intellisense.

What am I doing wrong?

Upvotes: 2

Views: 2902

Answers (2)

James
James

Reputation: 194

I had a similar problem where my custom HTML helper was not being found. I thought it was enough to put the helper's namespace in web.config. But you also need the using statement inside your view (I'm using razor):

@using MyProject.HtmlHelpers;

Thanks for posting this.

Upvotes: 6

Malcolm
Malcolm

Reputation: 12864

The problem was that I added the wrong using for the HtmlHelper class

using System.Web.WebPages.Html;

should have been

using System.Web.Mvc

Upvotes: 0

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