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https://issues.apache.org/jira/browse/LOG4NET-639?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ralph Goers updated LOG4NET-639:
--------------------------------
LOG4NET is now dormant.
> RollingFileAppender can't identify invalid filename
> ---------------------------------------------------
>
> Key: LOG4NET-639
> URL: https://issues.apache.org/jira/browse/LOG4NET-639
> Project: Log4net
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.0.8
> Reporter: GaoHu
> Priority: Minor
> Attachments: RollingFileAppender_patch.cs
>
> Original Estimate: 48h
> Remaining Estimate: 48h
>
> with log4net's RollingFileAppender [config
> example|[http://logging.apache.org/log4net/release/config-examples.html]]
> ，when I add datepattern set , RollingFileAppender will work with
> INTERNAL ERROR。
>
> InternalDebugging output:
> log4net: Moving
> [C:\Users\tiger\Source\Repos\MyAes\ConsoleApp1\bin\Debug\test.log] ->
> [C:\Users\tiger\Source\Repos\MyAes\ConsoleApp1\bin\Debug\test.log2019-12-07
> 14:10:37]
> {color:#ff0000}log4net:ERROR RollingFileAppender: INTERNAL ERROR. Append is
> False but OutputFile
> [C:\Users\tiger\Source\Repos\MyAes\ConsoleApp1\bin\Debug\test.log] already
> exists.{color}
> log4net: Opening file for writing
> [C:\Users\tiger\Source\Repos\MyAes\ConsoleApp1\bin\Debug\test.log] append
> [False]
>
> The reason is that the datePatter ,which as part of filename , has some
> invalid char。In my case, the ":" is invalid filename char on Windows。 So
> function RollFile 's Moving operation could not success，which leads
> functionOpenFile get INTERNAL ERROR。
>
> without InternalDebugging in produnction , the INTERNAL ERROR is confusing
> and without clear reason。 Maybe we should check the filename pattern as soon
> as possible，I wrote a little patch to check the datePattern in function
> ActivateOptions，wish it would help。The patch will check filename and reset
> datePattern if needed，with output as follows:
>
> log4net:WARN datepattern has invalid filename chars, it will replaced by
> [yyyy-MM-dd HH_mm_ss]
>
> example config with datePattern set：
>
>
> <appender name="RollingFile" type="log4net.Appender.RollingFileAppender">
> <file value="test.log"/>
> <appendToFile value="true"/>
> <maximumFileSize value="100KB"/>
> <maxSizeRollBackups value="2"/>
> {color:#FF0000}<datePattern value="yyyy-MM-dd HH:mm:ss"/>{color}
>
> <layout type="log4net.Layout.PatternLayout">
> <conversionPattern value="%date %level %thread %logger - %message%newline"/>
> </layout>
> </appender>
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