AzureFunctions.Global.CreateLogger C# (CSharp) Method

        private ILogger CreateLogger(ISettings settings, string fileName = null, string tableName = null, ICollection<DataColumn> additionalColumns = null, bool? logToFile = null, bool? logToSql = null)
        {
            var logsPath = string.IsNullOrEmpty(Environment.GetEnvironmentVariable("WEBSITE_SITE_NAME"))
                ? HostingEnvironment.ApplicationPhysicalPath
                : Path.Combine(Environment.GetEnvironmentVariable("HOME"), "LogFiles");

            var logger = new LoggerConfiguration()
                .Enrich.With<HttpRequestIdEnricher>()
                .Enrich.With<UserNameEnricher>()
                .Enrich.With<EventIdEnricher>();

            if (logToFile ?? settings.LogToFile && !string.IsNullOrEmpty(fileName))
            {
                logger = logger.WriteTo.RollingFile(Path.Combine(logsPath, fileName), fileSizeLimitBytes: null);
            }

            if (logToSql ?? settings.LogToSql &&
                !string.IsNullOrEmpty(settings.LoggingSqlServerConnectionString) &&
                !string.IsNullOrEmpty(tableName))
            {
                var columnOptions = new ColumnOptions
                {
                    AdditionalDataColumns = new Collection<DataColumn>
                    {
                        new DataColumn {DataType = typeof(string), ColumnName = "UserName"},
                        new DataColumn {DataType = typeof(string), ColumnName = "HttpRequestId"},
                        new DataColumn {DataType = typeof(int), ColumnName = "EventId"}
                    }
                    .Union(additionalColumns ?? Enumerable.Empty<DataColumn>())
                    .ToList()
                };
                logger = logger.WriteTo.MSSqlServer(settings.LoggingSqlServerConnectionString, tableName, restrictedToMinimumLevel: LogEventLevel.Information, columnOptions: columnOptions);
            }
            return logger.CreateLogger();
        }