Roslyn: How to get a reference to Workspace from currently loaded solution?

Question

I am trying to get a reference to currently loaded workspace, without success. As per documentation (part in bold) I should be able to get a reference to it.

The Workspace APIs are found in the Roslyn.Services namespace, and they are available if you include the following using directive:

using Roslyn.Services;

The workspace you use will typically be provided directly by the host environment (such as the Visual Studio IDE). However, you can work with a workspace outside of a host environment by constructing your own IWorkspace instance.

You can construct a workspace by loading a solution file.

IWorkspace workspace = Workspace.LoadSolution(@"HelloWorld.sln"); ISolution solution = workspace.CurrentSolution;

I tried following in unit test but workspace is null.

  IWorkspace workspace = Workspace.PrimaryWorkspace;

  ISolution solution = workspace.CurrentSolution;

I dont want to load solution, I want to work within currently loaded solution. How is it done? I am using Visual Studio 2012.

Edit:

Tried using switch /rootSuffx Roslyn as suggested in answer and VS throws an error that it is invalid switch. Changed it to /rootSuffix Roslyn, and VS starts but workspace is still null.

Answer 1

As described by Dustin Campbell in his answer here: How to work with Workspace.PrimaryWorkspace.CurrentSolution inside VSPackage

The primary workspace inside of Visual Studio is only populated when the Roslyn C# and Visual Basic language services are enabled.

To enable the Roslyn languages services you need to start your VS with the following command:

devenv.exe /rootSuffix Roslyn