Visual Studio 2017, Intellisense is not working

Question

I just upgraded from VS2015 to 2017, and intellisense highlighting of syntax errors has disappeared completely. I tried some suggestions found online, mainly Edit->Intellisense->Refresh Local Cache, but that option is not there anymore.

Under Edit->Intellisense there is only Quick info which does nothing when I press it, and toggle completion mode which is greyed out

I'm using Windows 10, C++ project. Do I need to delete some old files from VS2015 in order for intellisense to work again? like the VC.db file?

Thanks

Answer 1

If you encounter a file in which the intellisense or error list is not functioning properly, look at the top-left corner of the navigation bar and check to see if that file is marked as “Miscellaneous Files”

If it is, the steps to solve the issue is:

1. Go to the file inside Solution Explorer.

2. Right-Click file and select Exclude From Project.

3. Right-Click your project/folder where the file was and click Add Existing Item, and add the file you just removed back into your project.

This should fix whatever issues you're having. (Tip: You can multi-select source/header files, so this does not need to be done one at a time).