Correct way to use _viewstart.cshtml and partial R

问题:

I'm using _viewstart.cshtml to automagically assign the same Razor Layout to my views.

It's a dead simple file in the root of my Views folder that looks like this:

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

This is more DRY than adding the @Layout directive to every single view.

However, this poses a problem for Razor partial views, because they run the contents of _viewstart.cshtml and therefore incorrectly assign themselves a layout, which makes them, um, no longer partial.

Here's a hypothetical project, showing the _viewstart.cshtml file, the shared _layout.shtml file, and a partial view ("AnonBar.cshtml").

Currently, the way that I'm getting around this is by adding the following line to every partial view:

@{
    Layout = "";
}

This seems like the wrong way to denote a view as a partial in Razor. (Note that unlike the web forms view engine, the file extension is the same for partial views.)

Other options I considered but that are even worse:

• Putting all partial views into a common folder, so they could share a common _viewstart.cshtml. This breaks the convention of views being in the same folder as their controller.
• Not using partial views.

Is this something that is still being fleshed out by the Razor view engine team, or am I missing a fundamental concept?

回答1:

If you return PartialView() from your controllers (instead of return View()), then _viewstart.cshtml will not be executed.