C# ImmutableDictionary.GetValueOrDefault方法代码示例

        private static void HandleSyntaxTreeAnalysis(SyntaxTreeAnalysisContext context, ImmutableDictionary<string, ReportDiagnostic> specificDiagnosticOptions)
        {
            var syntaxRoot = context.Tree.GetRoot(context.CancellationToken);

            foreach (var trivia in syntaxRoot.DescendantTrivia().Where(trivia => trivia.IsKind(SyntaxKind.SingleLineCommentTrivia)))
            {
                if (trivia.ToString().StartsWith("////", StringComparison.Ordinal))
                {
                    // ignore commented out code
                    continue;
                }

                int triviaIndex;
                var triviaList = TriviaHelper.GetContainingTriviaList(trivia, out triviaIndex);

                if (!IsOnOwnLine(triviaList, triviaIndex))
                {
                    // ignore comments after other code elements.
                    continue;
                }

                if (IsPartOfFileHeader(triviaList, triviaIndex))
                {
                    // ignore comments that are part of the file header.
                    continue;
                }

                var trailingBlankLineCount = GetTrailingBlankLineCount(triviaList, ref triviaIndex);
                if (trailingBlankLineCount == 0)
                {
                    // ignore comments that are not followed by a blank line
                    continue;
                }
                else if (trailingBlankLineCount > 1)
                {
                    if (specificDiagnosticOptions.GetValueOrDefault(SA1507CodeMustNotContainMultipleBlankLinesInARow.DiagnosticId, ReportDiagnostic.Default) != ReportDiagnostic.Suppress)
                    {
                        // ignore comments that are followed by multiple blank lines -> the multiple blank lines will be reported by SA1507
                        continue;
                    }
                }
                else
                {
                    if (triviaIndex < triviaList.Count)
                    {
                        switch (triviaList[triviaIndex].Kind())
                        {
                        case SyntaxKind.SingleLineCommentTrivia:
                        case SyntaxKind.SingleLineDocumentationCommentTrivia:
                        case SyntaxKind.MultiLineCommentTrivia:
                        case SyntaxKind.MultiLineDocumentationCommentTrivia:
                            // ignore a single blank line in between two comments.
                            continue;
                        }
                    }
                }

                var diagnosticSpan = TextSpan.FromBounds(trivia.SpanStart, trivia.SpanStart + 2);
                context.ReportDiagnostic(Diagnostic.Create(Descriptor, Location.Create(context.Tree, diagnosticSpan)));
            }
        }