InvalidOperationException: The following sections have been defined but have not been rendered by the page at '/Views/Shared/UserLayout.cshtml'

Question

InvalidOperationException: The following sections have been defined but have not been rendered by the page at '/Views/Shared/UserLayout.cshtml'

IntelligentCancer 0

I'm trying to convert an ASP.NET MVC project to ASP.NET Core MVC. I have done most of the work but got stuck in a weird issue.

My project has a view User.cshtml and a layout page UserLayout.cshtml, based on an API call I was returning the view and its master page through return View("User", "UserLayout"); in ASP.NET MVC.

The method expects a view name and a master name. This overload doesn't exists anymore in ASP.NET Core MVC so I have set the layout on top of my User.cshtml page like this:

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

and returned just the view name from my controller.

Now my layout page contains Kendo tabstrip and in its content I'm rendering sections like @RenderSection("HomeTab", true) which are defined in UserLayout.cshmtl @section HomeTab {}. This is working completely fine with the ASP.NET MVC project, but when I run the ASP.NET Core MVC project, I'm getting this exception:

InvalidOperationException: the following sections have been defined but have not been rendered by the page at '/Views/Shared/UserLayout.cshtml': 'HomeTab'. To ignore an unrendered section call IgnoreSection("sectionName").

I have tried removing the section, changing the required attribute to false but the error remains. It seems I didn't need to convert views from .NET to .NET Core but it's this small thing that has got me stuck.

Anonymous

2023-07-25T02:55:38.78+00:00

Hi @IntelligentCancer

From the error message, we can see that this exception happens in the AgentLayout.cshtml layout, instead of the UserLayout.cshtml, so might be you are using wrong layout. Please check the related code or you can define the HomeTab section in the AgentLayout.cshtml layout.

Best Regards,
Dillion
IntelligentCancer 0 Reputation points

2023-07-25T11:18:23.1166667+00:00

Hi @Anonymous Apologies the layout is infact UserLayout.cshtml I made a mistake copying it. I have edited my question.
Anonymous

2023-07-26T01:23:38.96+00:00
Hi @IntelligentCancer

Can you create a minimal, complete sample to reproduce the problem, and then share it with us? According to your description, I create a sample and test it on my side, it seems that everything works well and can't reproduce the problem.

In my sample, if I define the section in the layout page as below:

@RenderSection("HomeTab", true)

In the content view page, we have to render the section:

@section HomeTab{ <div><h2>Home Tab</h2></div> }
IntelligentCancer 0 Reputation points

2023-07-26T16:17:13.36+00:00
Im not sure how I can share a minimal sample here, I can share my complete code though?

My Layout page is inside Views/Shared/UserLayout.cshtml my content page is inside Views/Home/User.cshtml. There are two layout pages _Layout.cshtml is being used for most views the ones that users UserLayout have it explicitly mentioned at the top of the view.

Also few things I tried that didn't work are

Changing the name of the section.

Creating a completely blank section without any of my code just a div.

I have few other sections that are rendering just fine I changed one of them to HomeTab and got the exception again.

I copied the code of HomeTab section to a partial view and then added @Html.Partial("HomeTab") that rendered it so I think the problem is not with the code?

The code where it won't work is basically a Kendo tabstrip. Im adding items to it and in the content of the first item im rendering the section. The rest of the items have Html.Partial in their content and they are working fine.

.Items(tabstrip => { if (!ViewBag.isOffline) { tabstrip.Add().Text("Home") .HtmlAttributes(new { id = "hometabid" }) .Selected(true) .ImageUrl(Url.Content("~/Content/Images/HomeTabIcon.png")).ImageHtmlAttributes(new { id = "hometabimgid" }) .Content(@<text> @RenderSection("HomeTab", false) </text>).ContentHtmlAttributes(new { @style = "overflow: auto;" }); }
Anonymous

2023-07-28T03:08:54.5266667+00:00

Hi @IntelligentCancer

From your description, it seems that you have already found that the issue relates the Kendo tabstrip, and you have already had the solution, right?
IntelligentCancer 0 Reputation points

2023-07-28T17:17:44.8533333+00:00

Sorry if I have caused a confusion at @Anonymous but no, I haven't found a solution because this code is running 100% fine with .net mvc its just not working with .net core.
I cant change the RenderSection to HTML.Partial for HomeTab.

1 answer

Your answer

Anonymous

2023-07-25T02:55:38.78+00:00

Hi @IntelligentCancer

From the error message, we can see that this exception happens in the AgentLayout.cshtml layout, instead of the UserLayout.cshtml, so might be you are using wrong layout. Please check the related code or you can define the HomeTab section in the AgentLayout.cshtml layout.

Best Regards,
Dillion
IntelligentCancer 0 Reputation points

2023-07-25T11:18:23.1166667+00:00

Hi @Anonymous Apologies the layout is infact UserLayout.cshtml I made a mistake copying it. I have edited my question.
Anonymous

2023-07-26T01:23:38.96+00:00

Hi @IntelligentCancer

Can you create a minimal, complete sample to reproduce the problem, and then share it with us? According to your description, I create a sample and test it on my side, it seems that everything works well and can't reproduce the problem.

In my sample, if I define the section in the layout page as below:

@RenderSection("HomeTab", true)

In the content view page, we have to render the section:

@section HomeTab{ <div><h2>Home Tab</h2></div> }
IntelligentCancer 0 Reputation points

2023-07-26T16:17:13.36+00:00

Im not sure how I can share a minimal sample here, I can share my complete code though?

My Layout page is inside Views/Shared/UserLayout.cshtml my content page is inside Views/Home/User.cshtml. There are two layout pages _Layout.cshtml is being used for most views the ones that users UserLayout have it explicitly mentioned at the top of the view.

Also few things I tried that didn't work are

Changing the name of the section.

Creating a completely blank section without any of my code just a div.

I have few other sections that are rendering just fine I changed one of them to HomeTab and got the exception again.

I copied the code of HomeTab section to a partial view and then added @Html.Partial("HomeTab") that rendered it so I think the problem is not with the code?

The code where it won't work is basically a Kendo tabstrip. Im adding items to it and in the content of the first item im rendering the section. The rest of the items have Html.Partial in their content and they are working fine.

.Items(tabstrip => { if (!ViewBag.isOffline) { tabstrip.Add().Text("Home") .HtmlAttributes(new { id = "hometabid" }) .Selected(true) .ImageUrl(Url.Content("~/Content/Images/HomeTabIcon.png")).ImageHtmlAttributes(new { id = "hometabimgid" }) .Content(@<text> @RenderSection("HomeTab", false) </text>).ContentHtmlAttributes(new { @style = "overflow: auto;" }); }
Anonymous

2023-07-28T03:08:54.5266667+00:00

Hi @IntelligentCancer

From your description, it seems that you have already found that the issue relates the Kendo tabstrip, and you have already had the solution, right?
IntelligentCancer 0 Reputation points

2023-07-28T17:17:44.8533333+00:00

Sorry if I have caused a confusion at @Anonymous but no, I haven't found a solution because this code is running 100% fine with .net mvc its just not working with .net core.
I cant change the RenderSection to HTML.Partial for HomeTab.

Answer 1

IntelligentCancer 0

Since I haven't found a concrete solution to having the section rendered, I copied the code of my HomeTab section from my view and inserted it directly to content section of my Kendo Tabstrip.

Anonymous

2023-08-02T01:55:31.2066667+00:00

Okay, I got it. Can you create a minimal, complete sample to reproduce the problem, and share it with us via Github or OneDrive (you can upload the minimal project to Github or OneDrive, then share the link)? Note: when share the project, please be aware of sensitive data.

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InvalidOperationException: The following sections have been defined but have not been rendered by the page at '/Views/Shared/UserLayout.cshtml'

1 answer

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