Visual Studio 2015 or 2017 shows IntelliSense erro

Question

We are currently evaluating the new Visual Studio 2015 and encountered a strange problem with IntelliSense. When I compiled our main solution with the new studio the build succeeds, but nevertheless 6 errors are shown.

I discovered that it's not a real error, but only an intellisense error. The code is definitely correct and everything compiled successfully. The code however is marked red and errors show up in the error list.

All 6 errors have the same origin. It's a simple constructor call. Strange enough, but there are also some occurrences of the exact same constructor without any errors.

The error message:

Code: CS1729
Message: '<the class>' does not contain a constructor that takes that many arguments.
Project: <the project name>
File: <the path to the file>

The new studio was installed on a freshly installed Windows 7 without any legacy software (no VS13).

I've already tried to clear the caches, deleted the suo file, deleted bin and obj directories, cleaned and rebuilt the solution etc. But nothing worked.

Can anyone explain that behavior to me?

Answer 1

Similar problem as others, but different resolution. Posting in case I can help someone else.

Running Visual Studio 2017 15.5.2. I use Git and frequently switch branches. Several weeks ago, I started having editors show me errors (all related to types it could not find even though references were valid). Compile worked great. I confirmed the same issue in VS 2017 15.6 Preview (Jan 6, 2018). I would try to delete cache, SUO files, or bin/obj folders and no impact. At first it would appear to work. Reopen Visual Studio and everything would look good. Use "Rebuild Solution" and the IntelliSense errors would returns. I even tried uninstall/reinstall of Visual Studio.

I had the same issue on two machines, both with same version of Visual Studio.

By looking at the errors about missing types, they all appeared to come from two referenced projects. One of those references was a shared project used by just about every other project in the solution, but one of them was a small project without many references. It just so happens that the small project was also referenced by my larger shared project. In Visual Studio, I unloaded the small project and reloaded it. The errors went away! They errors did not come back on Rebuild Solution.

I then switched Git branches and the errors all came back. Fortunately I repeated the above steps of unloading/reloading the small project and the errors went away.

Every time I switch Git branches, the errors come back until I repeat that process. There are zero changes between the Git branches for the smaller project that I unload/reload. Unclear why that sequence is fixing my issue.

Answer 2

Visual Studio 2017 I have deleted ".suo" file from location .vs\SolutionName\v15.suo And then restarted Visual studio. This worked for me.

Answer 3

I was seeing the intellisearch errors only when publishing a website. (ASP/C# site, VS 2017). They broke the publish. Site ran fine locally.

Cleared the errors by unchecking the setting to pre-compile, and it published fine. Publish -> Setting -> File Publish Options -> Precompile during publishing

Answer 4

Also had this problem with a migrated project, so I referenced the Microsoft.CSharp dll. In some projects I needed to remove and add again the Reference in the project.