I just installed VS 2017 and am opening an MVC 5 project created in VS 2015. The application runs fine, but I am experiencing reduced interactivity between my MVC Razor view code and the 2017 IDE.
Here's is the context menu when I right-click on an HTML helper method in VS 2015:
However, I only see this in 2017:
Also notice the lack of syntax color-coding in the 2017 verison. It's like it's not recognizing Razor syntax at all.
I did not do any special solution/project upgrades. I just opened the solution in 2017 and expected it to prompt me to upgrade any files that needed upgrading.