How can I use Url.Content inside of a @helper?

I'm making some @helper's inside of the App_Code folder. The intent is to completely replace my old HtmlHelpers written in a *.cs file with a string builder and all the other fun stuff.

Anyway, in a couple of places, I'm using Url.开发者_运维技巧Content in src attributes of <img> tags. These used to work fine as HtmlHelpers. Now, that I got my code inside *.cshtml file in App_Code folder, the site doesn't want to compile:

CS0103: The name 'Url' does not exist in the current context

What's a good way to solve this? I wouldn't want to have a relative path there instead of path mapping.

---

You could pass it as argument to the helper:

@helper Foo(UrlHelper url) {
    @url.Action("~/foo");
}

and then:

@Foo(Url)