4

The last line in the body element of my _Layout.cshtml is:

@RenderSection("Scripts", required: false)

Yet when I run my app, I get the exception:

The following sections have been defined but have not been rendered for the layout page "~/Views/Shared/_Layout.cshtml": "Scripts".

Strange enough right, because Scripts is not required. Then, in my login page, I comment out the following line:

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

And the app runs fine. Is this somehow because the jqueryval bundle is empty, so the view engine thinks that the Scripts section is not being rendered in _Layout.cshtml? My BundleConfig includes the script in question, and it is present in my Scripts folder, so what could be wrong?

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  • 1
    I can't reproduce this. Do you happen to have nested layout pages (which could throw that error) Commented Sep 9, 2015 at 4:36

5 Answers 5

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We consider that you know the Section requisites to work fine in MVC template. Such this strange errors occur when you have another errors (not really related to RenderSection) in page and the framework reflects the wrong error instead of showing the main one. Take a look at my recent issue which comes from an undefined and used ViewBag.sth in the related page. Or another example could be this post where the owner encounters error with mobile sometimes! The answer of the last one will be the same, I think the owner uses variables perhaps by the browser help to populate data on page and error occurs when they're not ready before finishing the page rendering. briefly say, Such this irrelevant errors occur when the view variables aren't ready (not enumerated or initialized) and the debugger shows us an strange error. So, you've used an unassigned and used variable during the page renders.

Solution: check the used variables (Dynamic variables like ViewBag or ViewData) in your page, tracking from master layout file to final rendered page (including partial views) to find out what happened.

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0

This must work:

@RenderSection("Scripts", false)

Also you can wrap the @RenderSection in an if block:

@if (IsSectionDefined("scripts"))
{
    RenderSection("scripts");
}

Update: Make sure that, the RenderSection has the same name with section defined in your views, for example in your _Layout you should have the following RenderSection:

@RenderSection("Scripts", required: false)

And in other views:

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

If the name (in this case Scripts) doesn't match, it throws that error:

The following sections have been defined but have not been rendered for the layout page "~/Views/Shared/_Layout.cshtml": "Scripts".

Also, make sure your _ViewStart.cshtml points to right layout:

Layout = "~/Views/Shared/_Layout.cshtml";
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1 Comment

The normal @RenderSection("Scripts", false) doesn't work, and I'm asking this question to find out why, not how to work around it like your second example. If Scripts is optional, the MVC runtime should be doing the @if (IsSectionDefined("scripts")), not me. But thanks, I may use the workaround if I don't come right in time.
0

Seems Layout page is rendering from _ViewStart and not referenced directly on your View. Please make sure that _Layout is referenced on your View directly, i.e:

@{Layout = "~/Views/Shared/_Layout.cshtml";}

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3 Comments

Why should I have to do that? What is the purpose of _ViewStart then?
ViewStart is a special view which derives from ViewStartPage instead of WebViewPage which other views derive from. And the ViewStartPage class doesn't have a DefineSection method. So you cannot define sections in this file.
RenderSection can consume only sections defined immediately by the view using them. Since _ViewStart runs before any view requested code runs, this is why it is not available there. This is by design. Currently Razor layouts can only consume (render) sections defined immediately by the view using them. You cannot have a hierarchy of layout pages and in the outermost layout consume a section defined in the innermost view.
0

I am posting this as an answer, because I don't have enough credits to post a comment to your question. Sorry.

But are you sure, your login page refers the same layout page?

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Comments

-1

Change 

@section Scripts {
    @Scripts.Render("~/bundles/jqueryval")
}

to this

@section Scripts
{
   <script type="text/javascript" src="@Url.Content("~/scripts/jqueryval.js")"></script> 
}

If you want to render scripts on a view page you must set 

@RenderSection("Scripts", required: true)
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1 Comment

Using a script tag defeats the purpose of the whole bundling and minifying feature of MVC, and I definitely don't want to move backwards like that. Then, required: true defeats the purpose of having optional script sections on my views.

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