protected override async Task <Dictionary <string, SlnFile> > ProcessImpl(Task <Solution> previousTask)
{
var slnObject = await previousTask;
Contract.Assert(slnObject is Solution s && s != null,
$"Expected previous task to return a Solution object, but found {slnObject} instead.");
var solution = (Solution)slnObject;
return(SolutionAnalyzer.AllSolutionFiles(solution, _workingDirectory));
}