ASP.NET 5 on VS 2015 - Can't build or debug solution

问题

I'm developing an ASP.NET 5 MVC 6 solution.

Unfortunately I can't remember what happened but I'm getting a strange issue where the IDE doesn't build solution.

When I hit Ctrl+Shift+B the following line appears in the output console:

1>------ Build started: Project: <My project name>, Configuration: Debug Any CPU ------

but nothing actually happens, and I can't close solution until I'd press Ctrl+Break to cancel build.

I'm however noticing a few strange things.

The References section of the project is followed by (Errors - see Error List), but no errors appear in the Error List.
In the Package Manager Console, no projects are present in the Default Project dropdown, and the Package Manager does complain about it.
The Debug menu contains no options but Start and Browse With, and when I hit Start, I get an error message saying:

The debugger cannot continue running the process. Unable to start debugging.
Running 'Restore Packages' (Ctrl+Shift+K+R) doesn't do anything either.
When trying update-package -reinstall command in the PM console, I get the following error:

No package updates are available from the current package source for project 'Ackount'.

Unfortunately I can't remember precisely what I changed before it happened so I can't reproduce the issue.

回答1:

I had a similar problem with asp.net 5 beta 8. I removed the DNX Core target, because i am only interested in dnx451 for this particular project, but after doing that it wouldn't build anymore. It just froze. I tried dnu restore, but it didn't seem to do anything.

In my case, i just removed the project from the solution then did a rebuild. I then added the project back to the solution, did another rebuild, and then for no obvious logical reason it started to build properly again - weird :)