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MVC3 's Razor View engine also provides @rendersection
My understanding: @RenderSection occupy a single digit in the master page, and then let the child pages that use this master page render their section themselves.
Define @rendersection ("section name") in master page _layout.cshtml
<body>Add a about.cshtml, use _layout.cshtml to make a master page
You can then define what "submenu" is going to render in about.cshtml
@{Here I implemented the submenu in about.cshtml, running the result
But when a page that uses _layout.cshtml as the master page does not implement section,
For example, my new index.cshtml does not implement @section submenu{...}, it throws an exception
This is because I am using @rendersection ("submenu") in _layout.cshtml, and he requires all the children to be implemented,
You can use one of its other overloaded @rendersection ("submenu", false), and the second parameter indicates that it is not required, so it does not throw an exception.
Also, when I define @rendersection ("submenu", false) in the master page, I want to not implement this section when all the sub-pages are
, the master page can have its own rendered content, which can be used
<div id= "SideBar" >This will display the defined content by default when no page renders the section.
MVC3 Razor @RenderSection
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