How to get unused references using roslyn?

Question

I have hundreds of projects and I want to remove unused references from each project using roslyn. I saw this https://github.com/dotnet/roslyn/issues/625 but I have no Idea If it's already implemented and If there is a poc example that I can start with.

Please help me If you have any idea how to do this.

Answer 1

I did it by registering the compilation action that simply examines all the source trees in a project, finds all symbols referenced by them and considers the assemblies that declare them used, so everything else that's referenced by the project is unused. Here's the analyzer: https://github.com/HellBrick/HellBrick.Diagnostics/blob/ff0b3a415475eda3d2e9927a2ab4638ada5d7148/src/HellBrick.Diagnostics/UnusedReferences/UnusedReferencesAnalyzer.cs

Not sure if this is the most clean and correct way to do this, but it seems to get the job done.