I want log files to be written to a directory where log files are kept. I'm using a RollingFileAppender with a datePattern. Here is what I have that doesn't work:
<?xml version="1.0" encoding="utf-8"?>
<log4net>
<appender name="RollingFile" type="log4net.Appender.RollingFileAppender">
<file value="x:\Logs\log" />
<immediateFlush value="true" />
<appendToFile value="true" />
<datePattern value="yyyyMMdd"/>
<maximumFileSize value="10MB" />
<maxSizeRollBackups value="5" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date %level %thread %logger - %message%newline" />
</layout>
</appender>
<root>
<level value="DEBUG" />
<appender-ref ref="RollingFile" />
</root>
</log4net>
I'm hoping this will result in something like:
x:\Logs\log-20211026.log
Instead I get
x:\Logs\log
Examples that I've seen use no path, e.g.:
<file value="log">
<datePattern value="yyyyMMdd"/>
Is there a way to have the data pattern, and an absolute path, and ".log" at the end?
Someone at my work had the answer:
The file name should contain the extention and 2 additional properties need to be set:
<file value="x:\Logs\log.log"/>
<preserveLogFileNameExtention value="true"/>
<staticLogFileName value="false"/>
Related
I've been trying to find documentation and guidance on how to use a separate log file in ASP.NET Boilerplate MVC.
It's straight forward to inject ILogger and push messages into the default Log.txt file, however I need a separate log file to record a lot of batch job messages and keep things tidy.
I can't find any methods to use another log from the Log4Net.config file. Can anyone advise on the correct code / configuration?
So I found the answer by chance in looking at the Hangfire documentation, where it was shown you can configure Hangfire messages to be sent to another log file by getting Log4Net to listen for the Hangfire name and route based on that.
With the following additional configuration in Log4Net.config I now have Log messages created normally within MyClass sent to the MyClass.txt log file:
<appender name="RollingFileAppender_MyClass" type="log4net.Appender.RollingFileAppender" >
<file value="App_Data/Logs/MyClass.txt" />
<appendToFile value="true" />
<rollingStyle value="Size" />
<maxSizeRollBackups value="32" />
<maximumFileSize value="10000KB" />
<staticLogFileName value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%-5level %date [%-5.5thread] %-40.40logger - %message%newline" />
</layout>
</appender>
<logger additivity="false" name="MyNamespace.MyClass">
<level value="DEBUG" />
<appender-ref ref="RollingFileAppender_MyClass" />
</logger>
And for completeness, it's called in the standard way documented within the AspNet Boilerplate documentation:
https://aspnetboilerplate.com/Pages/Documents/Logging
Way-1:
In this sample, the default log file is App_Data/Logs/Logs.txt.
But when I use the logger in the namespace MySite.Web.Controllers.PaymentController, the logs will be written in App_Data/Logs/PaymentLogs.txt
log4net.config
<?xml version="1.0" encoding="utf-8" ?>
<log4net>
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender" >
<file value="App_Data/Logs/Logs.txt" />
<appendToFile value="true" />
<rollingStyle value="Size" />
<maxSizeRollBackups value="10" />
<maximumFileSize value="10000KB" />
<staticLogFileName value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%-5level %date [%-5.5thread] %-40.40logger - %message%newline" />
</layout>
</appender>
<appender name="RollingFileAppender_PaymentController" type="log4net.Appender.RollingFileAppender" >
<file value="App_Data/Logs/PaymentLogs.txt" />
<appendToFile value="true" />
<rollingStyle value="Size" />
<maxSizeRollBackups value="32" />
<maximumFileSize value="10000KB" />
<staticLogFileName value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%-5level %date [%-5.5thread] %-40.40logger - %message%newline" />
</layout>
</appender>
<root>
<appender-ref ref="RollingFileAppender" />
<level value="DEBUG" />
</root>
<logger name="NHibernate">
<level value="WARN" />
</logger>
<logger name="MySite.Web.Controllers.PaymentController" additivity="false">
<appender-ref ref="RollingFileAppender_PaymentController" />
<level value="DEBUG" />
</logger>
</log4net>
Way-2:
You can get a specific logger by calling LogManager.GetLogger() with a appender name.
private static readonly ILog paymentLogger = LogManager.GetLogger("MySite.Web.Controllers.PaymentController");
I have a web project and a console project. I've published my web project on Azure (after having the console app attached as a Azure Webjob to the web project).
Now I want to use Log4net to log in files. It works for the web project but I can't get it to work for the Webjob...
Here is my log4net config :
<log4net>
<appender name="FileAppender" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="./_logs/[%date{yyyy-MM-dd-HH}]_webjob.log" />
<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
<appendToFile value="true" />
<rollingStyle value="Size" />
<maxSizeRollBackups value="10" />
<maximumFileSize value="4096KB" />
<staticLogFileName value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%newline %date [%thread] %-5level %logger - %message%newline" />
</layout>
</appender>
<logger name="myloggername">
<level value="ALL" />
<appender-ref ref="FileAppender" />
</logger>
Some guy said it would work with a absolute path but it doesn't :
<file type="log4net.Util.PatternString" value="D:/home/site/wwwroot/App_Data/Logs/AccountMaintenance/log4net_%date{yyyyMMdd}.log" />
Please try the following value instead:
<file type="log4net.Util.PatternString" value="d:\home\logfiles\mylogfile.log" />
We changed our log4net file name to include the current date but only want log files created on those dates that there is logged activity. This is our current configuration:
<log4net>
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="{0}\\logfiles\\log%date{{yyyyMMdd}}-${{COMPUTERNAME}}.log" />
<appendToFile value="true" />
<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
<rollingStyle value="Size" />
<maxSizeRollBackups value="10" />
<maximumFileSize value="10MB" />
<staticLogFileName value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date %-5level %logger %message%newline" />
</layout>
</appender>
<root>
<level value="WARN" />
<appender-ref ref="RollingFileAppender" />
</root>
</log4net>
It's producing empty files on days when the logger is created but no messages of WARN or greater are written. Is there a configuration to prevent empty files?
I am using the RollingLogFileAppender and it works great and it's rolling over into new files. But it's adding the .1, .2, etc at the very end of the file. So I end up with .log.1, .log.2, etc. So every file technically has a new extension that explorer doesn't know, so I can't just double click on a file to open.
How can I get the rolling file appender to insert that index BEFORE the file extension?
What I want is
.1.log
.2.log
Bonus would be for the current file to always be .0.log, that way they always sort correctly in explorer.
EDIT: added my current config settings
<log4net>
<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<lockingModel type="log4net.Appender.FileAppender+MinimalLock"/>
<file value="App_Data\\Logs\\" />
<datePattern value="dd.MM.yyyy'.log'" />
<staticLogFileName value="false" />
<appendToFile value="true" />
<rollingStyle value="Composite" />
<maxSizeRollBackups value="10" />
<maximumFileSize value="5MB" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
<logger name="File">
<level value="All" />
<appender-ref ref="RollingLogFileAppender" />
</logger>
</log4net>
You just need to use the PreserveLogFileNameExtension property on the RollingFileAppender.
See the following questions:
Log4net appender filename issue
Log4net RollingFileAppender Size rollingStyle file extension
I want my logfile to look something like this:
2009-02-13.log
but the problem is that I can't seem to find any way to add the .log extension.
I've tried a lot of things but nothing helps.
This is what I have this far:
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="Logs/Log4Net/.log"/>
<appendToFile value="true"/>
<rollingStyle value="Date"/>
<datePattern value="yyyy-MM-dd" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline"/>
</layout>
</appender>
The other answers escape the "g" in "log" since "g" is a special character in datePattern. This isn't wrong, but I prefer to wrap the entire set of non-date characters in single quotes, like so:
<datePattern value="yyyy-MM-dd'.log'" />
This gives the same results, but is easier for me to manage. This way, I don't have to recall which specific characters are special for datePattern (the list is long and varied). If I forget one character then I don't run the risk of borking my file names; they're all nicely escaped en masse.
Try adding the .log extension to your date pattern like so and remove it from the file attribute.
<datePattern value="yyyy-MM-dd.lo\g"/>
...
<staticLogFileName value="false" />
log4net now also provides a PreserveLogFileNameExtension property that can force your .log extension to the end of the compound file name (including date pattern and/or size sequence number):
<file value="LogFiles/.log"/>
<preserveLogFileNameExtension value="true" />
<datePattern value="yyyy-MM-dd" />
add ".lo\g" to the end of your datepattern
This is my log file xml config.
The path to the log file is in the "file" tag
This will create a log file "2012-11-22.log" under the folder "LogFiles" in the route folder of my website.
NOTE: Make sure that the folder exists first!
<?xml version="1.0"?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
</configSections>
<log4net>
<root>
<level value="INFO"/>
<appender-ref ref="RollingFileAppender"/>
</root>
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="LogFiles/"/>
<appendToFile value="true"/>
<rollingStyle value="Date"/>
<maxSizeRollBackups value="5"/>
<maximumFileSize value="10MB"/>
<datePattern value="yyyy-MM-dd'.log'" />
<staticLogFileName value="false"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %level %logger - %message%newline%exception"/>
</layout>
</appender>
</log4net>
</configuration>