public static string FlattenException()

in src/Microsoft.Azure.WebJobs.Host/Utility.cs [50:94]
36 lines of code
9 McCabe index (conditional complexity)

        public static string FlattenException(Exception ex, Func<string, string> sourceFormatter = null, bool includeSource = true)
        {
            StringBuilder flattenedErrorsBuilder = new StringBuilder();
            string lastError = null;
            sourceFormatter = sourceFormatter ?? ((s) => s);

            if (ex is AggregateException)
            {
                ex = ex.InnerException;
            }

            do
            {
                StringBuilder currentErrorBuilder = new StringBuilder();
                if (includeSource && !string.IsNullOrEmpty(ex.Source))
                {
                    currentErrorBuilder.AppendFormat("{0}: ", sourceFormatter(ex.Source));
                }

                currentErrorBuilder.Append(ex.Message);

                if (!ex.Message.EndsWith("."))
                {
                    currentErrorBuilder.Append(".");
                }

                // sometimes inner exceptions are exactly the same
                // so first check before duplicating
                string currentError = currentErrorBuilder.ToString();
                if (lastError == null ||
                    string.Compare(lastError.Trim(), currentError.Trim()) != 0)
                {
                    if (flattenedErrorsBuilder.Length > 0)
                    {
                        flattenedErrorsBuilder.Append(" ");
                    }
                    flattenedErrorsBuilder.Append(currentError);
                }

                lastError = currentError;
            }
            while ((ex = ex.InnerException) != null);

            return flattenedErrorsBuilder.ToString();
        }