ASP.Net MVC How to pass url parameters using Html.RenderAction to a ChildAction

Question

I thought this was going to be straight forward but I managed to hose it up some how. If I want to pass URL parameters to another action do I have to create a new route for that?

controller

[ChildActionOnly]
    public ActionResult ContentSection(string sectionAlias, string mvcController, string mvcAction = null)

view

@Html.RenderAction("ContentSection", "Portal", new {sectionAlias = "TermsAndConditions", mvcController = "Portal", mvcAction = "ChoosePayment"})

error

 CS1502: The best overloaded method match for 'System.Web.WebPages.WebPageExecutingBase.Write(System.Web.WebPages.HelperResult)' has some invalid arguments

Nathan Anderson · Accepted Answer · 2011-02-11 00:31:10Z

46

The problem here is that

@Html.RenderAction("ContentSection", "Portal", new {sectionAlias = "TermsAndConditions", mvcController = "Portal", mvcAction = "ChoosePayment"})

Is the equivalent to

<%= Html.RenderAction("ContentSection", "Portal", new {sectionAlias = "TermsAndConditions", mvcController = "Portal", mvcAction = "ChoosePayment"}) %>

In the the Webforms ViewEngine (which is also the same a Response.Write). Since RenderAction returns void, you cannot Response.Write it. What you want to do is this:

@{
     Html.RenderAction("ContentSection", "Portal", new {sectionAlias = "TermsAndConditions", mvcController = "Portal", mvcAction = "ChoosePayment"});
 }

The @{ } syntax signifies a code block in the Razor view engine, which would be equivalent to the following the the Webforms ViewEngine:

<% Html.RenderAction("ContentSection", "Portal", new {sectionAlias = "TermsAndConditions", mvcController = "Portal", mvcAction = "ChoosePayment"}); %>

answered Feb 11, 2011 at 0:31

Nathan Anderson

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3 Comments

James Nail Over a year ago

Or you can call @Html.Action(...) instead, in order to call it as a method that returns your content (if you don't like using the curly brackets, etc.)

JBeckton Over a year ago

Thanks, I just figured it out by reading another similar post. Thanks! I think this got me once before too..

Oliver Over a year ago

Yes, this is really a well-written answer. Thanks Nathan! And thanks to James Nail, too. Your hint was also valuable.

Oliver · Accepted Answer · 2022-02-14 12:56:11Z

17

The short answer is to use @Html.Action() like this:

@Html.Action("ContentSection", "Portal", new {sectionAlias = "Terms", ...})

The long answer was already given by Nathan Anderson.

P.S. Credit for this answer really goes to James Nail, who posted it as a comment in Nathan's answer, but I found it so easy and valuable that I thought it should be an individual answer.

edited Feb 14, 2022 at 12:56

answered Sep 2, 2011 at 22:32

Oliver

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