internal string CompareObservedDependencySummary(string header, ConcurrentDictionary <string, ObservedInputSummary> observedDependencySummary, ConcurrentDictionary <string, ObservedInputSummary> otherObservedDependencySummary) { var observedDifference = m_analyzer.GenerateObservedDifference(observedDependencySummary, otherObservedDependencySummary); if (observedDifference.fileArtifactChanges.Count == 0 && observedDifference.fileArtifactMissing.Count == 0) { return(string.Empty); } using (var output = new StringWriter(CultureInfo.InvariantCulture)) { output.WriteLine(header); WriteArtifactDiffLine(observedDifference.fileArtifactChanges, output, string.Empty); WriteArtifactDiffLine(observedDifference.fileArtifactMissing, output, "missing, "); return(output.ToString()); } }