Access WebViewPage from custom HTML Helper

Question

I've got a ASP.NET MVC 3 Razor Web Application.

I've got a WebViewPage extension:

public static bool Blah(this WebViewPage webViewPage)
{
   return blah && blah;
}

And i want to access this from my HtmlHelper extension:

public static MvcHtmlString BlahHelper(this HtmlHelper htmlHelper, string linkText, string actionName)
{
   // how can i get access to the WebViewPage extension method here?
}

I can of course duplicate the functionality of the WebViewPage extension if i had to, but just wondering if it's possible to access it from the HTML helper.

score 10 · Accepted Answer · answered Dec 22 '11 at 08:08

10

// Warning: this cast will crash
// if you are not using the Razor view engine
var wvp = (WebViewPage)htmlHelper.ViewDataContainer;
var result = wvp.Blah();

answered Dec 22 '11 at 08:08

Darin Dimitrov

1,023,142
271
3,287
2,928

Darin to the rescue AGAIN. Thanks buddy. :) – RPM1984 Dec 22 '11 at 23:30

score 0 · Answer 2 · answered Jun 03 '14 at 15:32

I had the same problem and the accepted answer led me to the solution (+1). Maybe this hint helps somebody else too. Additionally I had to use the generic version of WebViewPage inside a strongly type view. Otherwise I got a type cast exception.

public static MvcHtmlString ToBodyEnd<TModel>(this HtmlHelper<TModel> htmlHelper, ...) {
       var vp = (DerivedWebViewPage<TModel>)htmlHelper.ViewDataContainer;
    //... more code ...
    }

score 0 · Answer 3 · answered Dec 22 '11 at 02:04

0

You should change that method to extend HttpContextBase, which you can access from both HtmlHelper and WebViewPage.

answered Dec 22 '11 at 02:04

SLaks

868,454
176
1,908
1,964

the question wasn't really about the functionality of the extension, but how to achieve what i'm asking in a general sense. I've edited the question to reflect that – RPM1984 Dec 22 '11 at 02:08
I don't think that's possible; explore `htmlHelper` in the Locals window and see if you can find it. – SLaks Dec 22 '11 at 02:49

score 0 · Answer 4 · answered Dec 22 '11 at 02:11

0

I would try:

((WebViewPage)htmlHelper.ViewContext.View). Blah()

answered Dec 22 '11 at 02:11

ryudice

36,476
32
115
163

Nice try. It appears that `View` is actually the view engine, not the view page. And i'm using a custom view engine (Razor CSHTML generator), so the type is `PrecompiledRazorViewEngine`. – RPM1984 Dec 22 '11 at 02:26

Access WebViewPage from custom HTML Helper

4 Answers4