RollingFileAppender.RollingStyle Property
The default rolling style is Composite.
When set to Once this appender's AppendToFile property is set to false, otherwise the appender would append to a single file rather than rolling the file each time it is opened.
RollingFileAppender.CountDirection Property
Remarks
Indicates if the current file is the lowest numbered file or the highest numbered file.
By default newer files have lower numbers (CountDirection < 0), i.e. log.1 is most recent, log.5 is the 5th backup, etc...
小于0的时候，
第一次roll file，把log重命名为log.1，然后新建log
第二次roll file，把log.1重命名为log.2,把log重名为log.1，然后新建log
CountDirection >= 0 does the opposite i.e. log.1 is the first backup made, log.5 is the 5th backup made, etc. For infinite backups use CountDirection >= 0 to reduce rollover costs.
大于0的时候，
第一次roll file，把log重名为log.1，新建log
第二次roll file，把log重名为log.2，新建log
The default file count direction is -1.
Log4Net RollingFileAppender with composite rolling style is overwritting data
RollingFileAppender.RollingMode Enumeration
I want it to roll on just the date. By default, though, the rolling is set to composite, so it rolls on date or size, whichever comes first.
| Member name | Value | Description | |
|---|---|---|---|
| Once | 0 | Roll files once per program execution | |
| Size | 1 | Roll files based only on the size of the file | |
| Date | 2 | Roll files based only on the date | |
| Composite | 3 | Roll files based on both the size and date of the file |
Log4net preserveLogFileNameExtension not working
this is my log4net configuration, the rollover log file is created wrong extension.
The first file created with name of log_debug.txt and the rollover file created with log_debug.txt.1. but ideally it should be log_debug.1.txt.
I used preserveLogFileNameExtension value to be true, but it seems not working. Can you please check and let me know if anything wrong?
The PreserveLogFileNameExtension property set to true should do the trick. Note: this property is not available in the currently released version 1.2.10 but is part of the current source. If you grab and build the source you're good to go.
Update: it is great to see log4net is moving forward. Version 1.2.11, and with it the PreserveLogFileNameExtension property, have been released.
RollingFileAppender.StaticLogFileName Property
true if always should be logged to the same file, otherwise false.
Remarks
By default file.log is always the current file.
Optionally file.log.yyyy-mm-dd for current formatted datePattern can by the currently logging file (or file.log.curSizeRollBackup or even file.log.yyyy-mm-dd.curSizeRollBackup).
This will make time based rollovers with a large number of backups much faster as the appender it won't have to rename all the backups!
StaticLogFileName meaning?
If there's true, you always log to your example.log file, which is renamed as part of rollover procedure.
If there's false, you always log to example.log.yyyy-MM-dd.N (in common case) file and rollover is just creating one more such file.
意思是说，当前写日志的那个文件名字是否保持不变。默认是true。
如果为true的话，日志每次都往error.log里面写，等到了第二天，会把之前的errorlog重命名为error-20200702.log。然后重新创建一个error.log。
如果是false的话，日志每次都往带日期的日志里面写，比如error-20200701.log，到了第二天直接创建一个新的error-20200702.log。
RollingFileAppender.MaximumFileSize Property
public string MaximumFileSize { get; set; }
This property allows you to specify the maximum size with the suffixes "KB", "MB" or "GB" so that the size is interpreted being expressed respectively in kilobytes, megabytes or gigabytes.
For example, the value "10KB" will be interpreted as 10240 bytes.
The default maximum file size is 10MB.
If you have the option to set the maximum file size programmatically consider using the MaxFileSize property instead as this allows you to set the size in bytes as a Int64.