Optional section was not defined error in nested layout pages

user_522663 0
Viewed 1077

I have a _Layout.cshtml file that contains the following line.

@RenderSection("Scripts", required: false)

And then I have a StorageLayout.cshtml file that specifies _Layout.cshtml as the layout file. StorageLayout.cshtml defines the MainMenu section and contains @RenderBody().

But then my page that uses StorageLayout.cshtml as the layout file gives me an error:

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

I'm not sure I understand this. The Scripts section is explicitly not required, so why is it an error? And, for that matter, what would be the correct way to implement this section in nested layout files?

asp.net5 razor-pages asp.net-core asp.net c#
1 Answers

required is set to false, which means the section is optional.If the section is not optional, every content page that references the layout page must use the @section directive to define the section and provide content:-

@section Scripts{
    // content here
}

In some cases, you might want to make a section optional, but you want to provide some default content in the event that the content page didn't provide anything for the section. You can use the IsSectionDefined method for this:-

@if(IsSectionDefined("OptionalSection"))
{
    @RenderSection("OptionalSection")
}
else
{
    // default content
}

Any sections defined in the master layout should also be redefined in child layouts:-

_MasterLayout.cshtml

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8" />
        <title></title>
        <link href="/css/site.css" rel="stylesheet" type="text/css" />
    </head>
    <body>
        @RenderBody()
        @RenderSection("scripts", required:false)
    </body>
</html>

_ChildLayout.cshtml

@{
    Layout = "/_MasterLayout";
}
<div class="main-content-two-col">
@RenderBody()
</div>
@section scripts {
  @RenderSection("scripts", required: false)
}

I think this would help resolve your issue.

user_114632960
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