Visual Studio 2015 Broken Razor Intellisense

Question

This has been recurring for me also and seems to be connected to extension updates but I have not yet been able to blame anything specific. What I have been able to discover is a less intrusive resolution.

In my case deleting the contents of this directory allows the IDE to recover:

%LocalAppData%\Microsoft\VisualStudio\14.0\ComponentModelCache

Edit: I just came across this one which might be handy too - Clear MEF Component Cache (Open VSIX Gallery)

I solved this problem by resetting the user data

devenv.exe /resetuserdata

and remove the ".vs" folder in my project.

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WARNING: this will reset all your user settings. Essentially, it is like resetting to factory defaults. You will lose any custom keyboard shortcuts, extensions you've installed etc.

FWIW, I had this problem with VS 2015 Enterprise on two different machines. On one machine, resetting user data made the problem go away (for a while). On the other machine, I had to totally uninstall and reinstall VS, and the problem went away for a while. On both machines, the problem came back after I installed an extension (once when installing Web Essentials, once when installing Git Diff Margin).

I burned an MSDN tech support case, and the answer was... Yeah, it's a bug, MS knows about it, and they're working on it.

Not a particularly actionable answer, but an answer nonetheless...

EDIT: And on the subject of working around the problem, I've encountered the problem a few more times since I posted this "answer". Most recently, I installed an update to NuGet Package Manager, and when VS restarted it started having this problem. I ran devenv.exe /resetuserdata, but that didn't help; it was still broken. So I tried again (ran devenv.exe /resetuserdata) and, bada bing bada boom, the problem went away (for now). The moral seems to be something along the lines of "if at first you don't succeed..."

Might have happened due to having ReSharper.

It will be fixed in future versions, but as of now (version 10.0.2), it is broken. ReSharper overrides the IntelliSense of Visual Studio and therefore it will not work, which also explains why running devenv.exe /ResetUserData fixes it since it removes ReSharper.

Manually return the IntelliSense power to VS through the menu:
ReSharper >> Enviroment >> IntelliSense >> Fill the following:

And this is how the IntelliSense from VS should look:

I met the same problem, but the cause was different from the other answers.

An update of Visual Studio (I suspect TypeScript update on September 2015) uninstalled the Web Developer Tools component of Visual Studio 2015. That causes IntelliSense not to work.

I installed Web Developer Tools in the installer options again AND deleted ComponentModelCache after the installation. That worked for me.