Release notes from NLog

NLog 6.1.1

2026-02-28T15:55:54Z

Improvements

#6101 LogFactory - Flush / FlushAsync asynchronous completion outside Target lock. (@snakefoot)
#6100 NLog.Targets.AtomicFile supporting NetStandard2 with Win32 API. (@michailf)
#6094 XmlLayout - Faster XML encoding with INoAllocationStringValueRenderer. (@snakefoot)
#6091 LiteralWithRawValueLayoutRenderer - Only support RawValue when possible. (@snakefoot)
#6088 CachedLayoutRendererWrapper - Allow literal optimization when caching not needed. (@snakefoot)

NLog 6.1

2026-01-31T19:18:51Z

Improvements

#5999 JsonLayout - Added support for DottedRecursion. (@thatrajeevkr)
#6084 JsonLayout - Protect against cyclic object graphs when DottedRecursion. (@snakefoot)
#6075 DebuggerTarget - Add support for MaxMessageSize and OnOverflow-action. (@snakefoot)
#6070 InternalLogger - Auto enable LogLevel.Info when activated. (@snakefoot)
#6045 LoggingConfigurationParser - Report unrecognized options in targets and rules section. (@snakefoot)
#6059 LogEventBuilder - Properties with IReadOnlyCollection for initialCapacity. (@snakefoot)
#6065 FileTarget - Adjust ArchiveSuffixFormat to better handle legacy ArchiveFileName. (@snakefoot)
#6079 FileTarget - Replace Environment.TickCount with LogEventInfo.TimeStamp. (@snakefoot)
#6066 FileTarget - Simplify FileName natural ordering logic. (@snakefoot)
#6069 FileTarget - Reduce code complexity for NaturalStringComparer. (@snakefoot)
#6064 FileTarget - Reduce code complexity for ArchiveNumbering property. (@snakefoot)
#6082 JsonLayout - Faster Json encoding with INoAllocationStringValueRenderer. (@snakefoot)
#6083 CsvLayout - Faster CSV encoding with INoAllocationStringValueRenderer. (@snakefoot)
#6081 DefaultJsonSerializer - Reduce overhead of PerformJsonEscapeWhenNeeded. (@snakefoot)
#6025 LogEventInfo - Changed LayoutCache from dictionary to linked list. (@snakefoot)
#6049 PropertiesDictionary - Increase initial capacity when insert. (@snakefoot)
#6061 PropertiesDictionary - Simplify enumerator when mixing property types. (@snakefoot)
#6074 WhenEmpty - Optimize when IsFixedText. (@snakefoot)
#6062 BufferingTargetWrapper - Improve InternalLogger output when WrappedTarget is NULL. (@snakefoot)
#6067 Fix nullable warnings from NET10 annotations. (@snakefoot)
#6068 Support nullable where TKey : notnull for dictionary. (@snakefoot)
#6071 AssemblyExtensionTypes - Reduce code complexity. (@snakefoot)
#6072 LoggingConfigurationFileLoader - Handle unknown type loading for App.config. (@snakefoot)
#6076 Marked ConversionHelpers.TryParseEnum as obsolete. (@snakefoot)
#5949 CallSiteLayoutRenderer - Obsoleted CleanNamesOfAnonymousDelegates + CleanNamesOfAsyncContinuation. (@snakefoot)

NLog 6.0.7

2025-12-09T08:04:37Z

Improvements

#6056 FileTarget - Archive Cleanup sort filenames using natural ordering. (@snakefoot)
#6054 EventProperties - Format Dictionary Properties correctly. (@snakefoot)
#6051 Failure to create config item should be reported as InternalLogger Error. (@snakefoot)
#6052 PropertiesDictionary - Faster TryGetValue without IsEmpty. (@snakefoot)
#6048 PropertiesDictionary - Increase initial capacity when insert. (@snakefoot)
#6047 LogEventInfo - Minor optimization of HasImmutableProperties. (@snakefoot)
#6057 WhenEmpty - Support AppDomainFixedOutput optimization. (@snakefoot)
#6053 JsonAttribute - Reduce code complexity when Encode = false. (@snakefoot)
#6044 Target also enforce PreventMultipleCalls when WriteFailedNotInitialized. (@snakefoot)
#6042 NLog.RegEx - Fixed Wiki-link in nuget-package. (@snakefoot)

NLog 6.0.6

2025-11-20T17:15:38Z

Improvements

#6027 FileTarget - Improve archive cleanup when using ArchiveSuffixFormat with datetime. (@snakefoot)
#6028 FileTarget - Fix archive cleanup when only single old file and using MaxArchiveDays. (@snakefoot)
#6039 FileTarget - Render ArchiveSuffixFormat using NLog DefaultCultureInfo. (@snakefoot)
#6030 ObjectReflectionCache - Improve handling of JObject serialization. (@snakefoot)
#6026 JsonLayout - Reduce code complexity for rendering JsonAttribute. (@snakefoot)
#6036 NullTarget - Improve thread concurrency when FormatMessage = false. (@snakefoot)
#6023 MemoryTarget - Apply MaxLogsCount limit on next LogEvent. (@snakefoot)
#6040 XmlParser - Refactor to reduce code complexity. (@snakefoot)
#6041 ScopeContextAsyncState - Refactor to reduce code complexity. (@snakefoot)

NLog 6.0.5

2025-10-09T06:21:35Z

Improvements

#5998 FileTarget - Rolling to next directory should not fail. (@snakefoot)
#6013 ValueFormatter - Skip quotes for CaptureType.Stringify unless legacy mode. (@snakefoot)
#6007 ColoredConsoleTarget - Use Span to reduce string-allocation for word-highlighting. (@snakefoot)
#6009 NullTarget - Avoid string-allocation upfront when FormatMessage = true. (@snakefoot)
#6012 XmlLoggingConfiguration - Reduce output for InternalLogger Info-Level. (@snakefoot)
#6006 XmlLoggingConfiguration - Protect against double dispose of AutoReloadConfigFileWatcher. (@snakefoot)
#6008 LoggerImpl - Merge WriteToTargetWithFilterChain into Write. (@snakefoot)
#6010 LoggingConfiguration - Redirect AddRuleForOneLevel and AddRuleForAllLevels to AddRule. (@snakefoot)
#6011 LoggingRule - Align EnableLoggingForLevels to skip when minLevel is LogLevel.Off. (@snakefoot)
#6015 CompoundLayout - Changed to foreach for better release optimizations. (@snakefoot)
#6016 CsvLayout - Changed to foreach for better release optimizations. (@snakefoot)
#6017 JsonArrayLayout - Changed to foreach for better release optimizations. (@snakefoot)
#6018 XmlLayout - Changed to foreach for better release optimizations. (@snakefoot)

NLog 6.0.4

2025-09-20T12:26:29Z

Improvements

#5979 FileTarget - Improve file-wildcard for archive cleanup. (@snakefoot)
#5980 FileTarget - Extend InternalLogger output with archive cleanup reason. (@snakefoot)
#5981 FileTarget - Strict wildcard check only possible when single wildcard. (@snakefoot)
#5987 FileTarget - Improve archive cleanup with dynamic seq-no. (@snakefoot)
#5988 FileTarget - Avoid parsing archive sequence number when other digits. (@snakefoot)
#5996 FileTarget - Improve fallback logic when missing file system birthtime. (@snakefoot)
#5964 ColoredConsoleTarget - WholeWords should only highlight the word. (@snakefoot)
#5967 ColoredConsoleTarget - Fixed boxing issue in ConsoleRowHighlightingRule. (@karpinsn)
#5968 Simplify WithAutoFlush-method for fluent config API. (@snakefoot)
#5970 Fix boxing for registration of builtin condition methods. (@snakefoot)
#5977 ConditionExpression - Implicit operator with NotNullIfNotNull-attribute. (@GREsau)
#5982 SimpleLayout - Implicit operator with NotNullIfNotNull-attribute. (@snakefoot)
#5992 MessageLayoutRenderer - Handle Exception.ToString() can throw with AOT. (@snakefoot)
#5983 Append4DigitsZeroPadded - Use Span instead of multiple StringBuilder.Append(). (@snakefoot)
#5985 Extracted NLog.WindowsRegistry to own git repository. (@snakefoot)
#5985 Extracted NLog.Targets.Trace to own git repository. (@snakefoot)
#5985 Extracted NLog.Targets.ConcurrentFile to own git repository. (@snakefoot)
#5985 Extracted NLog.Targets.Database to own git repository. (@snakefoot)
#5985 Extracted NLog.Targets.Mail to own git repository. (@snakefoot)
#5985 Extracted NLog.Targets.WebService to own git repository. (@snakefoot)
#5985 Extracted NLog.Targets.Network to own git repository. (@snakefoot)

NLog 6.0.3

2025-09-20T12:27:28Z

#5952 FileTarget - Close old files when reaching OpenFileCacheSize. (@snakefoot)
#5948 FileTarget - Closing on OpenFileCacheTimeout apply least recently used. (@snakefoot)
#5947 FileTarget - Improved file-archive exception handling when KeepFileOpen=false. (@snakefoot)
#5954 ColoredConsoleTarget - Added Words-property for easy highlighting of many words without RegEx. (@snakefoot)
#5955 LogMessageTemplateFormatter - Also use IValueFormatter for positional templates. (@snakefoot)
#5953 NLog.Targets.Network - Updated links in README.md for nuget-package. (@snakefoot)
#5945 NLog.Targets.AtomicFile - Added README.md for nuget-package. (@snakefoot)
#5940 SplunkTarget - Support SplunkFields-property. (@snakefoot)

NLog 6.0.2

2025-09-20T12:28:15Z

#5930 XmlParser - Handle XML comments after root-end-tag. (@snakefoot)
#5929 XmlLoggingConfiguration - Improve handling of invalid XML. (@snakefoot)
#5933 Handle invalid message template when skipping parameters array. (@snakefoot)
#5915 ReplaceNewLinesLayoutRendererWrapper - Replace more line ending characters. (@oikku)
#5911 NLog.Targets.GZipFile - Improve support for ArchiveAboveSize. (@snakefoot)
#5921 FileTarget - Activate legacy ArchiveFileName when ArchiveSuffixFormat contains legacy placeholder. (@snakefoot)
#5924 AsyncTargetWrapper - Updated FullBatchSizeWriteLimit default value from 5 to 10. (@snakefoot)
#5937 Mark Assembly loading with RequiresUnreferencedCodeAttribute for AOT. (@snakefoot)
#5938 Logger - Align WriteToTargets with WriteToTargetsWithSpan. (@snakefoot)
#5909 ConfigurationItemFactory - Added extension hints for webservice and activityid. (@snakefoot)
#5918 Log4JXmlTarget - Removed alias NLogViewer as conflicts with other nuget-packages. (@snakefoot)
#5926 SplunkTarget - NetworkTarget with SplunkLayout. (@snakefoot)
#5927 GelfLayout - Align with SplunkLayout. (@snakefoot)
#5913 NLog.Targets.Network - Updated nuget-package README.md. (@snakefoot)
#5912 NLog.Targets.Trace - Updated nuget-package README.md. (@snakefoot)
#5919 XML docs for Targets and Layouts with remarks about default value. (@snakefoot)
#5922 XML docs for LayoutRenderers with remarks about default value. (@snakefoot)
#5925 XML docs for Target Wrappers with remarks about default value. (@snakefoot)
#5935 Improve NLog XSD Schema with better handling of typed Layout. (@snakefoot)
#5923 Updated unit-tests from NET6 to NET8. (@snakefoot)

NLog 5.5.1

2025-07-21T05:31:47Z

#5858 ConsoleTarget - Added ForceWriteLine to match NLog v6 Schema (@snakefoot)
#5866 Layout.FromLiteral to match NLog v6 (@snakefoot)
#5888 ChainsawTarget with type-alias Log4JXml to match NLog v6 (@snakefoot)
#5883 AsyncTargetWrapper - LogEventDropped and EventQueueGrow events fixes (@dance)
#5890 StringBuilderExt - Change Append2DigitsZeroPadded to array-lookup (@snakefoot)
#5936 XmlLayout - Support MaxRecursionLimit == 0 (@snakefoot)
#5936 RegisterObjectTransformation so build trimming will keep public properties (@snakefoot)

NLog 6.0.1

2025-06-28T06:09:33Z

Improvements

#5898 Changed ConditionExpression to be nullable by default since no Condition means no filtering. (@snakefoot)
#5906 Include ConditionExpression in the static type registration. (@snakefoot)
#5895 Fixed the new XML parser to handle XML comments just before end-tag. (@snakefoot)
#5905 Fixed the new XML parser to allow InnerText with greater-than characters. (@snakefoot)
#5891 Updated NLog.Targets.AtomicFile to support net8.0-windows without dependency on Mono.Posix.NETStandard. (@snakefoot)