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I have a top-level _Layout.cshtml that looks something like this:
<html>
<head>
@RenderSection("Header", required: false)
</head>
<body>
@RenderSection("LeftPane", required: false)
@RenderSection("RightPane", required: false)
@RenderBody()
</body>
</html>
Then I have two "sub-layouts." One defines just the LeftPane section, the other defines both a LeftPane and a RightPane. These sub-layouts are called _LeftPane.cshtml and _LeftPlusRightPane.cshtml, and they have Layout set to "_Layout.cshtml."
Then in each View .cshtml file, I set the Layout to either _LeftPane.cshtml or _LeftPlusRightPane.cshtml, depending on what I want to show up on the page.
That all works fine. The problem is with the new "Header" section I've added in the <head> portion of the document. This section is not defined in the sub-layouts, but rather in the actual Views. When I try to view something this way, I get the error:
The following sections have been defined but have not been rendered for the layout page "~/Views/Shared/_LeftPlusRightPane.cshtml": "Header".
I don't want to render the Header section in the sublayouts, I want to render it up in the _Layout.cshtml file. How do I "pass through" the defined Header section from the low level view, through the sub-layouts, up to the top _Layout?
355
@RenderSection is used for injecting content in the defined section. It allows you to specify a region in Layout. Two steps are there to define @RenderSection in ASP.NET MVC. A. Specify a @RenderSection Area in Layout Page.
A layout page can only contain one RenderBody method, but can have multiple sections. To create a section you use the RenderSection method. The difference between RenderSection and RenderPage is RenderPage reads the content from a file, whereas RenderSection runs code blocks you define in your content pages.
Razor is a markup syntax that lets you embed server-based code into web pages using C# and VB.Net. It is not a programming language. It is a server side markup language. Razor has no ties to ASP.NET MVC because Razor is a general-purpose templating engine.
You can nest layouts. So _Layout2 has Layout = "_Layout.cshtml";
You can also use _ViewStart files in each of your View subfolders to specify a different default layout for that subfolder.
To "pass through" the section, you just do something like this:
@section Header {@RenderSection("Header", false)}
That allows you to pass content up the chain.
185
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