Asp.net-mvc – Html.RenderPartial giving me strange overload error

asp.net-mvcasp.net-mvc-3razorrenderpartial

I made a test partial page named _Test.cshtml and put it in the same directory as my view that will be calling it, here it is:

<div>hi</div>

And in the calling cshtml view, I simply put:

@Html.RenderPartial("_Test")

Which gives me the error:

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

I have also tried the full path with the same result.

I am very confused as to why this is acting this way, I assume I am missing something simple?

Best Answer

You are getting this error because Html.RenderXXX helpers return void - they have nothing to return because they are writing stuff directly* to response. You should use them like this:

@{ Html.RenderPartial("_Test"); }

There is also Html.Partial helper, which will work with your syntax, but I'd not recommend using it unless you have to, because of performance (it first composes given partial view into string, and then parent view puts it into response*).

* this is not entirely true, they are actually being rendered into ViewContext.Writer and once whole page is rendered and composed, the whole thing goes to response

Related Solutions

.net – Html.Partial vs Html.RenderPartial & Html.Action vs Html.RenderAction

Html.Partial returns a String. Html.RenderPartial calls Write internally and returns void.

The basic usage is:

// Razor syntax
@Html.Partial("ViewName")
@{ Html.RenderPartial("ViewName");  }

// WebView syntax
<%: Html.Partial("ViewName") %>
<% Html.RenderPartial("ViewName"); %>

In the snippet above, both calls will yield the same result.

While one can store the output of Html.Partial in a variable or return it from a method, one cannot do this with Html.RenderPartial.

The result will be written to the Response stream during execution/evaluation.

This also applies to Html.Action and Html.RenderAction.

.net – The difference between Html.Action and Html.RenderAction

Try:

@{Html.RenderAction("Breadcrumb", "Navigation", new {SeoUrl = Model.CarlineBucket.SEOURLName});}

@Html.RenderAction() generates a write call to output something on the page and in your case you are not doing so because RenderAction renders the result directly to the Response.

Instead of

@Html.RenderAction()

Use

@{Html.RenderAction();}

Best Answer

Related Solutions

.net – Html.Partial vs Html.RenderPartial & Html.Action vs Html.RenderAction

.net – The difference between Html.Action and Html.RenderAction

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