Why I cant use Html.RenderPartial in razor helper view File in App_Code Folder?

StackOverflow https://stackoverflow.com/questions/12510840

Question

Simple Razor Helper in App_Code Folder:

MyHelper.cshtml 

@using System.Web.Mvc

@helper SimpleHelper(string inputFor){
    <span>@inputFor</span>
    Html.RenderPartial("Partial");
}

Simple View in Views/Shared Folder:

MyView.cshtml 

<html>
    <head

    </head>
    <body>
        @WFRazorHelper.SimpleHelper("test")
    </body>
</html>

Simple Partial View in Views/Shared Folder:

Partial.cshtml 

<h1>Me is Partial</h1>

Compiler throws an Error:

CS1061: 'System.Web.WebPages.Html.HtmlHelper' enthält keine Definition für 'RenderPartial', und es konnte keine Erweiterungsmethode 'RenderPartial' gefunden werden, die ein erstes Argument vom Typ 'System.Web.WebPages.Html.HtmlHelper' akzeptiert (Fehlt eine Using-Direktive oder ein Assemblyverweis?).

But if I call Html.RenderPartial in MyView.cshtml everything works fine.

I guess I have to change some web.configs, because the HtmlHelper in MyView is taken from System.Web.Mvc and the HtmlHelper in MyHelper.cshtml is taken from System.Web.WebPages.

How do I fix this?

Was it helpful?

Solution

Html is a property of the WebPage, so you have access to it only inside the view. The custom helper in your App_Code folder doesn't have access to it.

So you need to pass the HtmlHelper as parameter if you need to use it inside:

@using System.Web.Mvc.Html

@helper SimpleHelper(System.Web.Mvc.HtmlHelper html, string inputFor)
{
    <span>@inputFor</span>
    html.RenderPartial("Partial");
}

and then call the custom helper by passing it the HtmlHelper instance from the view:

<html>
    <head>

    </head>
    <body>
        @WFRazorHelper.SimpleHelper(Html, "test")
    </body>
</html>
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