Visual Studio Cannot open cshtml Files

Question

I have a problem, which I cannot solve. I can't open every cshtml-File in a Visual Studio c# mvc project (whatever which project i tried). I get the following error Msg (I try to translate to English):

Object reference not set to an instance to an object

Google says, it may be a NullReferenceExeception. But it has nothing to do with my code, because first I can execute the project successfully and second the error occurs in every project (since today).

Answer 1

I just experienced the same issue. It just came out of nowhere, as you described. I even went through a 2 hour repair. That didn't fix it.

However, a coworker suggested this fix.

Visual Studio 2015 not syntax highlighting razor nor Intellisense

I had the same problem, the only fix so far is by resetting all user data (C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\Common7\\IDE\\devenv.exe /ResetUserData).

Now I am able to use the real default editing and I get good syntax highlighting again.

Answer 2

The solution that worked for me was from here

1. Close VS
2. Delete the content of %LocalAppData%\\Microsoft\\VisualStudio\\15.0\\ComponentModelCache
3. Open VS

As suggested by @jamez14, if your are using a different version of Visual Studio, just change 15.0 in the path to the version you have.

Answer 3

I faced the following issue.

ISSUE: All .cshtml were not opening in visual studio 17 community.

REASON: Accendently shutdown laptop by power off button while files were open in visual studio.

I tried all the above solutions but none worked.

Following solution worked for me.

Repaired Visual Studio using Visual Studio Installer .

Answer 4

I had the same problem and the issue turned out that I had disabled Razor Language Service Pack.

To re-enable go to :

Tools > Extensions and Updates > search for Razor Language Package and enable. Close VS and reopen.

Answer 5

在控制台中运行命令： C:\\Program Files (x86)\\Microsoft Visual Studio 14.0\\Common7\\IDE\\devenv.exe /ResetUserData应该可以解决您的问题，因为它会重置所有用户数据

Answer 6

这对我有用： Visual Studio 2015 Broken Razor Intellisense没有重置我的首选项或导致其他副作用。

Answer 7

It is caused by the version of Razor when updates by NuGet and clean the solution. re-build the project and will open without problems.

Answer 8

I had this same thing recently, resetting profiles and the like didn't work, it turned out that I had some dodgy web.config settings:- Removing these lines and re-building the project appeared to solve the issue and I could open cshtml files normally:

<add key="webpages:Version" value="4.0.0.0" />
<add key="webpages:Enabled" value="false" />

I found this solution in a github bug thread that mentions many other potential fixes. It seems to be related to updating your version of ASP.Net on an existing project.