I have added my log4net.config setting at the end of my question.
In "MyLog.txt" file I want to log timestamp in EST format using just the config file.
It should replace the %date in config below. I have seen some random articles suggest something like %d{yyyy-MM-dd HH:mm:ss}{GMT-4} but that didnt work.
I also read that Log4j has something called EnhancedPatternLayout which seems to have such date options. But Log4net has nothing equivalent.
Please share if you have some solution to show EST dynamically in Log irrespective of the Server timezone it runs on.
<appender name="ApiLoggerAppender" type="log4net.Appender.RollingFileAppender">
<lockingModel type="log4net.Appender.FileAppender+MinimalLock"/>
<file value="C:\MyLog.txt"/>
<appendToFile value="true" />
<rollingStyle value="Date" />
<datePattern value="-ddMMyyyy" />
<PreserveLogFileNameExtension value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %level %logger - %message%newline" />
</layout>
</appender>
I have a log4net wrapper for logging error messages in web api application. It is working fine but i am not able to log calling method name. It only display's top level method name. Lets say, i have a method a of class A which calls method b of a class B and b logs error message. Log4net only displays Class A and method a but i want to display either full calling chain A-a-B-b or at least B-b
private static readonly ILog LoggerObject = LogManager.GetLogger("ErrorLog");
log4net config
<log4net>
<appender name="ErrorLog" type="log4net.Appender.RollingFileAppender">
<file value="LogBackUp2.log" />
<staticLogFileName value="false" />
<appendToFile value="true" />
<rollingStyle value="Date" />
<datePattern value="yyyy-MM-dd.'Err'" />
<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%M %C] - %message%newline" />
</layout>
</appender>
<logger name="ErrorLog">
<maximumFileSize value="15MB" />
<appender-ref ref="ErrorLog" />
</logger>
</log4net>
If i use this then log4net doesn't create any log file.
LogManager.GetLogger(System.Reflection.MethodBase.GetCurrentMethod().DeclaringType)
use %stacktrace{5} to show 5 levels of the stacktrace which lead to the call of the log method. Replace the 5 with the level you want to have. example:
<conversionPattern value="%date [%thread] %-5level %logger [%stacktrace{5}] - %message%newline" />
When you use a log4net wrapper you may want to apply this to get rid of the wrapper in the stacktrace
I want to save all logs during each day in folder named YYYYMMdd - log4net should handle creating new folder depending on system datetime - how I can setup this?
I want to save all logs during the day to n files of 1MB - I don't want to rewrite old files but to really have all logs during one day - how I can setup this?
I am usin C#
Regards
Alex
Try this (It should be OK!):
<appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="logs\\" />
<appendToFile value="true" />
<DatePattern value="yyyy\\\\MM\\\\dd'.inf.log'" />
<rollingStyle value="Date" />
<param name="StaticLogFileName" value="false" />
<layout type="log4net.Layout.PatternLayout">
<header value="[Header]
" />
<footer value="[Footer]
" />
<conversionPattern value="%date [%thread] %-5level %logger [%ndc] <%property{auth}> - %message%newline" />
</layout>
</appender>
It will create a logfile named 'logs\2010\04\02.inf.log' (let date be 2010-04-02)
Thank you all.
We created SortByFolderFileAppender, which inherit from RollingFileAppender
Example of final result:
somewhere\Logs\20100305\Client-104615.0
namespace CustomLogging
{
public class SortByFolderFileAppender : log4net.Appender.RollingFileAppender
{
protected override void OpenFile(string fileName, bool append)
{
//Inject folder [yyyyMMdd] before the file name
string baseDirectory = Path.GetDirectoryName(fileName);
string fileNameOnly = Path.GetFileName(fileName);
string newDirectory = Path.Combine(baseDirectory, DateTime.Now.ToString("yyyyMMdd"));
string newFileName = Path.Combine(newDirectory, fileNameOnly);
base.OpenFile(newFileName, append);
}
}
}
<appender name="SortByFolderFileAppender" type="CustomLogging.SortByFolderFileAppender">
<file type="log4net.Util.PatternString" value="Logs\Client"/>
<appendToFile value="true"/>
<rollingStyle value="Composite"/>
<datePattern value="-HHmmss"/>
<maxSizeRollBackups value="40"/>
<maximumFileSize value="1MB"/>
<countDirection value="1"/>
<encoding value="utf-8"/>
<staticLogFileName value="false"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date{HH:mm:ss.fff}|%-5level|%message%newline"/>
</layout>
</appender>
I believe, you may create your own appender, based on the FileAppender class. You may need to override the OpenFile method to create a file in the right location.
You could use the rollinglogfileappender which creates files named by date and starts a new file at midnight. Then just write a script that moves them to a correct map at 00.01.
As for logging all files during one day with a maximum of 1 MB per file, here's an example:
<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="Logging\\MWLog"/>
<appendToFile value="true"/>
<rollingStyle value="Composite"/>
<datePattern value="-yyyyMMdd"/>
<maxSizeRollBackups value="-1"/>
<maximumFileSize value="1MB"/>
<countDirection value="1"/>
<encoding value="utf-8"/>
<staticLogFileName value="false"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date{HH:mm:ss.fff}|%-5level|%message%newline"/>
</layout>
</appender>
To build from the answer above using the SortByFolderFileAppender.
This is how we resolved the issue using rolling date for log filenames. I changed the staticLogFileName to true so the entire filename is passed into the OpenFile method.
If the filename ends in ".log" then nothing needs to be appended. I'm guessing some kind of locking has occurred and I want log4net to try using the same filename again, hoping the previous lock has been released.
Although, I'm not sure if this could end up causing an infinite call to OpenFile if the file is locked and won't let go of it. We did create a web service using the producer consumer pattern to log everything in one location from all applications in the system, which is currently ten and growing.
We don't need to include log4net into any of the other applications but we needed to create a web client class that is accessible by all applications to use for logging to the web service.
The result for the filename is "Logs\Client\2017\11\08.log" and obviously changes everyday.
protected override void OpenFile( string fileName, bool append )
{
// append "\yyyy\mm\dd.log" to create the correct filename.
if ( !fileName.EndsWith( ".log") )
fileName = $#"{fileName}\{DateTime.Now:yyyy\\MM\\dd}.log";
base.OpenFile( fileName, append );
}
Modification of the configuration from above.
<appender name="xxxRollingFileAppender" type="namespace.xxxRollingFileAppender">
<file value="Logs\Client"/>
<staticLogFileName value="true"/>
<appendToFile value="true"/>
<maxSizeRollBackups value="40"/>
<maximumFileSize value="1MB"/>
<encoding value="utf-8"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date{HH:mm:ss.fff}|%-5level|%message%newline"/>
</layout>
</appender>
When I log in my dev environment there is no problem but when I deploy with a windows installer no log files are produced:
<log4net>
<root>
<level value="ALL"/>
<appender-ref ref="LogFileAppender"/>
</root>
<appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender">
<lockingModel type="log4net.Appender.FileAppender+MinimalLock"/>
<param name="File" value="C:\Logs\log-file.txt"/>
<param name="AppendToFile" value="true"/>
<rollingStyle value="Size"/>
<maxSizeRollBackups value="10"/>
<maximumFileSize value="10MB"/>
<staticLogFileName value="true"/>
<layout type="log4net.Layout.PatternLayout">
<param name="ConversionPattern" value="%date [%thread] %-5level %logger [%C{1}.%M] - %message%newline"/>
</layout>
</appender>
</log4net>
I read that it may be that it cannot find the app.config but how do I tell it where to find it?
The issue was that log4net couldn't find the config file at run time after the dll was installed. Fixed by a suggestion here. In the end, my solution looked like this:
FileInfo fi = new FileInfo(AppDomain.CurrentDomain.BaseDirectory + "Assembly.dll.config");
log4net.Config.XmlConfigurator.Configure(fi);
_log.Info("Hello logging...");
Thank you for all of your input!
The app.config project file is turned to the the application.exe.config file after compilation. Maybe you are not deploying it with the installer?
I have one windows service. For Logging purpose in that service I am using Log4Net.dll. Now my requirement is that I want to create a new log file everyday and it should keep the log of only previous 7 days. Means on 8th day, it should delete first day file and use new file. I am using appender as:
<appender name="LogFileAppender" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="D:\Log\%property{LogName}" />
<AppendToFile value="true" />
<rollingStyle value="Date" />
<maxSizeRollBackups value="100" />
<staticLogFileName value="false" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%newline %date %-5level %C.%M() - %message" />
</layout>
</appender>
And at service startup I am configuring logger as:
log4net.GlobalContext.Properties["LogName"] = "App_" + DateTime.Now.ToString("MMddyyyy") + ".log";
log4net.Config.XmlConfigurator.Configure();
So is there any functionality of Log4Net that will achieve above functionality? Or is there any other way to do it? Any type of help will be appreciated.
I'm afraid you can't: RollingFileAppender Class
A maximum number of backup files when rolling on date/time boundaries
is not supported
Have a look at this thread for other suggestions: Log4Net: set Max backup files on RollingFileAppender with rolling Date
To implement log file everyday you would use:
<rollingStyle value="Date" />
<datePattern value="yyyyMMdd" />