C# Class NLog.Targets.FileTarget

Inheritance: NLog.Targets.TargetWithLayoutHeaderAndFooter, ICreateFileParameters

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Private Properties

Property	Type	Description
ArchiveByDate	void
ArchiveByDateAndSequence	void
ArchiveBySequence	void
ArchiveFile	void
AutoClosingTimerCallback	void
ContainsFileNamePattern	bool
CreateFileNameLayout	NLog.Internal.FilePathLayout
DeleteAndWaitForFileDelete	void
DeleteOldArchiveFile	bool
DeleteOldDateArchives	void
DoAutoArchive	void
EnsureArchiveCount	void
FinalizeFile	void
FindDateAndSequenceArchives	IEnumerable
FlushCurrentFileWrites	void
GetArchiveDate	System.DateTime
GetArchiveDateFormatString	string
GetArchiveFileName	string
GetArchiveFileNameBasedOnFileSize	string
GetArchiveFileNameBasedOnTime	string
GetArchiveFileNamePattern	string
GetFileAppenderFactory	IFileAppenderFactory
GetFiles	IEnumerable
GetFooterBytes	byte[]
GetFullFileName	string
GetHeaderBytes	byte[]
GetLayoutBytes	byte[]
GetPotentialFileForArchiving	string
InitializeFile	bool
IsArchivingEnabled	bool
PreviousLogOverlappedPeriod	bool
ProcessLogEvent	void
ProcessOnStartup	void
RefreshArchiveFilePatternToWatch	void
RefreshFileArchive	void
ReplaceFileContent	void
ReplaceFileNamePattern	string
ReplaceNumberPattern	string
RollArchivesForward	void
ShouldDeleteOldArchives	bool
StopAppenderInvalidatorThread	void
TryArchiveFile	void
TryParseDateAndSequence	bool
WriteFooter	void
WriteHeader	void
WriteToFile	void

Public Methods

Method	Description
CleanupInitializedFiles ( ) : void	Removes records of initialized files that have not been accessed in the last two days. Files are marked 'initialized' for the purpose of writing footers when the logging finishes.
CleanupInitializedFiles ( System.DateTime cleanupThreshold ) : void	Removes records of initialized files that have not been accessed after the specified date. Files are marked 'initialized' for the purpose of writing footers when the logging finishes.
FileTarget ( ) : System	Initializes a new instance of the FileTarget class. The default value of the layout is: `${longdate}\|${level:uppercase=true}\|${logger}\|${message}`
FileTarget ( string name ) : System	Initializes a new instance of the FileTarget class. The default value of the layout is: `${longdate}\|${level:uppercase=true}\|${logger}\|${message}`

Protected Methods

Method	Description
CloseTarget ( ) : void	Closes the file(s) opened for writing.
FlushAsync ( AsyncContinuation asyncContinuation ) : void	Flushes all pending file operations. The timeout parameter is ignored, because file APIs don't provide the needed functionality.
GetBytesToWrite ( LogEventInfo logEvent ) : byte[]	Gets the bytes to be written to the file.
GetFormattedMessage ( LogEventInfo logEvent ) : string	Formats the log event for write.
InitializeTarget ( ) : void	Initializes file logging by creating data structures that enable efficient multi-file logging.
TransformBytes ( byte value ) : byte[]	Modifies the specified byte array before it gets sent to a file.
Write ( NLog.Common.AsyncLogEventInfo logEvents ) : void	Writes the specified array of logging events to a file specified in the FileName parameter. This function makes use of the fact that the events are batched by sorting the requests by filename. This optimizes the number of open/close calls and can help improve performance.
Write ( LogEventInfo logEvent ) : void	Writes the specified logging event to a file specified in the FileName parameter.

Private Methods

Method	Description
ArchiveByDate ( string fileName, string pattern, LogEventInfo logEvent ) : void	Archives the fileName using a date style numbering. Archives will be stamped with the prior period (Year, Month, Day, Hour, Minute) datetime. When the number of archive files exceed the obsolete archives are deleted.
ArchiveByDateAndSequence ( string fileName, string pattern, LogEventInfo logEvent ) : void	Archives the fileName using a date and sequence style numbering. Archives will be stamped with the prior period (Year, Month, Day) datetime. The most recent archive has the highest number (in combination with the date). When the number of archive files exceed P:MaxArchiveFiles the obsolete archives are deleted.
ArchiveBySequence ( string fileName, string pattern ) : void	Archives the fileName using a sequence style numbering. The most recent archive has the highest number. When the number of archive files exceed P:MaxArchiveFiles the obsolete archives are deleted.
ArchiveFile ( string fileName, string archiveFileName ) : void	Archives fileName to archiveFileName.
AutoClosingTimerCallback ( object state ) : void
ContainsFileNamePattern ( string fileName ) : bool	Determines if the file name as String contains a numeric pattern i.e. {#} in it. Example: trace{#}.log Contains the numeric pattern. trace{###}.log Contains the numeric pattern. trace{#X#}.log Contains the numeric pattern (See remarks). trace.log Does not contain the pattern. Occasionally, this method can identify the existence of the {#} pattern incorrectly.
CreateFileNameLayout ( Layout value ) : NLog.Internal.FilePathLayout
DeleteAndWaitForFileDelete ( string fileName ) : void
DeleteOldArchiveFile ( string fileName ) : bool
DeleteOldDateArchives ( string pattern ) : void	Deletes archive files in reverse chronological order until only the MaxArchiveFiles number of archive files remain.
DoAutoArchive ( string fileName, LogEventInfo eventInfo ) : void	Invokes the archiving process after determining when and which type of archiving is required.
EnsureArchiveCount ( List oldArchiveFileNames ) : void	Deletes files among a given list, and stops as soon as the remaining files are fewer than the setting. Items are deleted in the same order as in oldArchiveFileNames. No file is deleted if property is zero.
FinalizeFile ( string fileName, bool isArchiving = false ) : void	Writes the file footer and finalizes the file in FileTarget instance internal structures.
FindDateAndSequenceArchives ( string dirName, string logFileName, string fileNameMask, int minSequenceLength, string dateFormat, FileNameTemplate fileTemplate ) : IEnumerable	Searches a given directory for archives that comply with the current archive pattern.
FlushCurrentFileWrites ( string currentFileName, LogEventInfo firstLogEvent, MemoryStream ms, List pendingContinuations ) : void
GetArchiveDate ( string fileName, LogEventInfo logEvent ) : System.DateTime
GetArchiveDateFormatString ( string defaultFormat ) : string	Gets the correct formatting to be used based on the value of for converting values which will be inserting into file names during archiving. This value will be computed only when a empty value or is passed into defaultFormat
GetArchiveFileName ( string fileName, LogEventInfo ev, int upcomingWriteSize ) : string	Indicates if the automatic archiving process should be executed.
GetArchiveFileNameBasedOnFileSize ( string fileName, int upcomingWriteSize ) : string	Gets the file name for archiving, or null if archiving should not occur based on file size.
GetArchiveFileNameBasedOnTime ( string fileName, LogEventInfo logEvent ) : string	Returns the file name for archiving, or null if archiving should not occur based on date/time.
GetArchiveFileNamePattern ( string fileName, LogEventInfo eventInfo ) : string	Gets the pattern that archive files will match
GetFileAppenderFactory ( ) : IFileAppenderFactory	Returns the suitable appender factory ( IFileAppenderFactory) to be used to generate the file appenders associated with the FileTarget instance. The type of the file appender factory returned depends on the values of various FileTarget properties.
GetFiles ( DirectoryInfo directoryInfo, string fileNameMask ) : IEnumerable	Gets the collection of files in the specified directory which they match the fileNameMask.
GetFooterBytes ( ) : byte[]	The sequence of to be written for the file footer.
GetFullFileName ( LogEventInfo logEvent ) : string	Get full filename (=absolute) and cleaned if needed.
GetHeaderBytes ( ) : byte[]	The sequence of to be written for the file header.
GetLayoutBytes ( Layout layout ) : byte[]	The sequence of to be written in a file after applying any formating and any transformations required from the Layout. Usually it is used to render the header and hooter of the files.
GetPotentialFileForArchiving ( string fileName ) : string	Returns the correct filename to archive
InitializeFile ( string fileName, LogEventInfo logEvent, bool justData ) : bool	Initialise a file to be used by the FileTarget instance. Based on the number of initialised files and the values of various instance properties clean up and/or archiving processes can be invoked.
IsArchivingEnabled ( ) : bool
PreviousLogOverlappedPeriod ( LogEventInfo logEvent, System.DateTime lastWrite ) : bool
ProcessLogEvent ( LogEventInfo logEvent, string fileName, byte bytesToWrite ) : void
ProcessOnStartup ( string fileName, LogEventInfo logEvent ) : void	Invokes the archiving and clean up of older archive file based on the values of and properties respectively.
RefreshArchiveFilePatternToWatch ( ) : void	Refresh the ArchiveFilePatternToWatch option of the FileAppenderCache. The log file must be watched for archiving when multiple processes are writing to the same open file.
RefreshFileArchive ( ) : void
ReplaceFileContent ( string fileName, byte bytes, bool firstAttempt ) : void	Creates the file specified in fileName and writes the file content in each entirety i.e. Header, Content and Footer. This method is used when the content of the log file is re-written on every write.
ReplaceFileNamePattern ( string pattern, string replacementValue ) : string	Replaces the string-based pattern i.e. {#} in a file name with the value passed in parameter.
ReplaceNumberPattern ( string pattern, int value ) : string	Replaces the numeric pattern i.e. {#} in a file name with the value parameter value.
RollArchivesForward ( string fileName, string pattern, int archiveNumber ) : void	Archives the fileName using a rolling style numbering (the most recent is always #0 then #1, ..., #N. When the number of archive files exceed P:MaxArchiveFiles the obsolete archives are deleted. This method is called recursively. This is the reason the archiveNumber is required.
ShouldDeleteOldArchives ( ) : bool	Determine if old archive files should be deleted.
StopAppenderInvalidatorThread ( ) : void
TryArchiveFile ( string fileName, LogEventInfo ev, int upcomingWriteSize ) : void	Archives the file if it should be archived.
TryParseDateAndSequence ( string archiveFileNameWithoutPath, string dateFormat, FileNameTemplate fileTemplate, System.DateTime &date, int &sequence ) : bool	Parse filename with date and sequence pattern
WriteFooter ( string fileName ) : void	Writes the footer information to a file.
WriteHeader ( BaseFileAppender appender ) : void	Writes the header information to a file.
WriteToFile ( string fileName, LogEventInfo logEvent, byte bytes, bool justData ) : void	Evaluates which parts of a file should be written (header, content, footer) based on various properties of FileTarget instance and writes them.

Method Details

CleanupInitializedFiles() public method

Removes records of initialized files that have not been accessed in the last two days.

Files are marked 'initialized' for the purpose of writing footers when the logging finishes.

public CleanupInitializedFiles ( ) : void
return	void

CleanupInitializedFiles() public method

Removes records of initialized files that have not been accessed after the specified date.

Files are marked 'initialized' for the purpose of writing footers when the logging finishes.

public CleanupInitializedFiles ( System.DateTime cleanupThreshold ) : void
cleanupThreshold	System.DateTime	The cleanup threshold.
return	void

CloseTarget() protected method

Closes the file(s) opened for writing.

protected CloseTarget ( ) : void
return	void

FileTarget() public method

Initializes a new instance of the FileTarget class.

The default value of the layout is: ${longdate}|${level:uppercase=true}|${logger}|${message}

public FileTarget ( ) : System
return	System

FileTarget() public method

Initializes a new instance of the FileTarget class.

The default value of the layout is: ${longdate}|${level:uppercase=true}|${logger}|${message}

public FileTarget ( string name ) : System
name	string	Name of the target.
return	System

FlushAsync() protected method

Flushes all pending file operations.

The timeout parameter is ignored, because file APIs don't provide the needed functionality.

protected FlushAsync ( AsyncContinuation asyncContinuation ) : void
asyncContinuation	AsyncContinuation	The asynchronous continuation.
return	void

GetBytesToWrite() protected method

Gets the bytes to be written to the file.

protected GetBytesToWrite ( LogEventInfo logEvent ) : byte[]
logEvent	LogEventInfo	Log event.
return	byte[]

GetFormattedMessage() protected method

Formats the log event for write.

protected GetFormattedMessage ( LogEventInfo logEvent ) : string
logEvent	LogEventInfo	The log event to be formatted.
return	string

InitializeTarget() protected method

Initializes file logging by creating data structures that enable efficient multi-file logging.

protected InitializeTarget ( ) : void
return	void

TransformBytes() protected method

Modifies the specified byte array before it gets sent to a file.

protected TransformBytes ( byte value ) : byte[]
value	byte	The byte array.
return	byte[]

Write() protected method

Writes the specified array of logging events to a file specified in the FileName parameter.

This function makes use of the fact that the events are batched by sorting the requests by filename. This optimizes the number of open/close calls and can help improve performance.

protected Write ( NLog.Common.AsyncLogEventInfo logEvents ) : void
logEvents	NLog.Common.AsyncLogEventInfo	An array of objects.
return	void

Write() protected method

Writes the specified logging event to a file specified in the FileName parameter.

protected Write ( LogEventInfo logEvent ) : void
logEvent	LogEventInfo	The logging event.
return	void