protected override string GetDocumentationForSymbol(string documentationMemberID, CultureInfo preferredCulture, CancellationToken cancellationToken = default(CancellationToken)) { var symbol = DocumentationCommentId.GetFirstSymbolForDeclarationId(documentationMemberID, _compilation); if (symbol != null) { return(symbol.GetDocumentationCommentXml(preferredCulture, cancellationToken: cancellationToken)); } return(string.Empty); }