How to read diagnostics messages?

[kulamit]

I'm trying to read Diagnostics message in experimental visual studio instance while creating/testing new analyzer. However I'm not getting the diagnostics messages which are published by analyzer created by me. I can see those messages in visual studio's error list, error symbol is getting highlighted but I want to read those message which are posted in error list.

I tried following method for reading,

SemanticModel semanticModel = vsWorkspace.CurrentSolution.GetDocument(location.SourceTree).GetSemanticModelAsync().Result;
semanticModel.GetDiagnostics();

It list some messages which are hidden but not returning messages which are seen in error list and posted during analysis.

How can I read those diagnostics messages?

Thanks!

[jmarolf]

semanticModel.GetDiagnostics() does not cause analyzers to run, it only asks the compiler to compute diagnostics.

Today if you do

ImmutableArray<DiagnosticAnalyzer> analyzers = ... // set of analyzers you want to run
Compilation compilation = await vsWorkspace.CurrentSolution.GetDocument(location.SourceTree).Project.GetCompilationAsync();
CompilationWithAnalyzers compilationWithAnalyzers = compilation.WithAnalyzers(analyzers);
AnalysisResult analysisResult = await compilationWithAnalyzers.GetAnalysisResultAsync()

analysisResult will contain all the analyzer diagnostics from runnint the analyzers over the project.

@kulamit which version of VS are you using? we plan to change where analyzers run in the near future.
CC @tmat