We Keep Coding

How to shorten log4net logger path

my log4net conversionpattern displays full path to class:
11:40:11,209 [C:\Users\martin\Documents\Visual Studio 2015\Projects\MyProject\MyProject\ViewModels\MainViewModel.cs] DEBUG - Test log
Is there a way how to shorten path to class name only?
11:40:11,209 [MainViewModel.cs] DEBUG - Test log

It's also my typical experience to have trouble with the odd conversion nomenclature and the scant levels of documentation that seems to be available in a central location.
I have adapted the conversion pattern I normally use to get you something similar to what you requested:
<conversionPattern value="%d %-22.22c{1} %-5p - %m%n"/>
The %-22.22c{1} bit is the shortened class name (I guess) :)
The above will result in something like:
2015-12-28 11:11:26,892 MyClass DEBUG - Test log

in the log4net configuration try using
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%-4thread] %-5level %logger{1} - %message%newline"/>
</layout>

use conversion pattern value like following
<conversionPattern value="[%d{yyyy-MM-dd HH:mm:ss}] [%t] %-5p %c - %m%n" />
See more in about conversionPattern

Retrieving file value from log4net's config file

I'm stuck in a situation where I believe I need to know the name of the log file that the user has specified in logging.xml. Specifically, I am trying to retrieve the value of the value attribute in the file element, as shown below (taken from the log4net docs)
For full details see the SDK Reference entry:
log4net.Appender.FileAppender.
The following example shows how to configure the FileAppender to write messages to a file. The file specified is log-file.txt. The file
will be appended to rather than overwritten each time the logging
process starts.
<appender name="FileAppender" type="log4net.Appender.FileAppender">
<file value="log-file.txt" />
<appendToFile value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] - %message%newline" />
</layout>
</appender>
When I loop over the appenders with the following code:
log4net.Repository.ILoggerRepository repo = LogManager.GetRepository();
foreach (log4net.Appender.IAppender appender in repo.GetAppenders())
{
FileAppender fa = appender as FileAppender;
}
I am unable to find the value "log-file.txt" anywhere in the fa object. Perhaps I have missed it since there are a lot of members and data exposed in the debugger.
Can anyone suggest a way to get at this value?

FileAppender has property File which contains path to the file that logging will be written to. But before you start looking for this property, verify Name of appender - you can have several FileAppenders configured.
Also keep in mind that RollingFileAppender also matches condition appender is FileAppender, because it is derived from FileAppender.
string file = repo.GetAppenders()
.OfType<FileAppender>()
.Where(fa => fa.Name == "FileAppender")
.Single()
.Name;

log4net EventLog custom logname created, but not used

In a project, i'm using log4net to write down in the event log. I need to create a custom log so all will go there. I have tried to add the event to different logs, and it worked, but for some reasons, now it is impossible to change the logname from the config file. Even if I change it, it will keep the previous one and log into it. Here is a sample of my app.config:
<appender name="EventLogAppender" type="log4net.Appender.EventLogAppender">
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date{yyyy-MMMM-dd HH:mm:ss, fff} [%thread] %level %message %exception%newline"/>
</layout>
<filter type="log4net.Filter.LevelRangeFilter">
<levelMin value="DEBUG" />
<levelMax value="FATAL" />
</filter>
<ApplicationName>TestLoggerFichierConfig</ApplicationName>
<LogName>AgentLogger</LogName>
</appender>
I read that the event log must be restarted when adding a new log so the recent events will be displayed in it. I did this, and it allowed me to see the new log that has been created, but nothing will go there. Is it possible to force Log4Net to stop using the previous log to rather use the one I defined in the app.config?
Thanks for the help.
Update:
It seems that le EventLogs recognizes the source application and decide in wich log to put the new events since he remembers where it previously went. When I first set the logName, it works fine. If I stop the app, change the logname and restart it, the event will still go to the previous log. If the logName does not exists in the event log, it will be created, but not used! There might be something to do, but it is not in the side of log4net, and it may be dangerous to change the windows settings at this level. I created two eventLogAppender on the same app.config file, both pointing at different logs. the events got to the same log though. It is being obvious that the problem doesn't come from log4net, and the solution to my problem will not be solved by code. Thanks for the great advices though.

Something is probably wrong with your configuration and it is simply not telling you about it because log4net itself is designed to never, ever throw errors.
You can turn on internal debugging for log4net, but don't deploy to production with log4net debugging turned on. Weirdness will eventually happen if deploy your product with the log4net debugging switch on.
http://haacked.com/archive/2006/09/27/Log4Net_Troubleshooting.aspx
http://logging.apache.org/log4net/release/faq.html (see the troubleshooting section)

I ran into this and it wasn't down to log4net but the re-mapping of the source to a new custom log. I took log4net out of the equation and finding that the problem occurred usint the EventLog class directly, I eventually found EventLog.CreateEventSource is not creating a custom log
I think it's also the reason behind this Windows service always writes to custom log and application log

First and foremost, I'd encourage you to turn on internal debugging, as found in the link ntcolonel posted. Add this to your config file:
<add key="log4net.Internal.Debug" value="true"/>
Perhaps I am not understanding your question entirely, but I'd like to ensure you have both created the appender and properly tell log4net that you want to actually use that appender:
<log4net debug="true">
<appender name="RollingFileAppender" type="log4net.Appender.RollingFileAppender">
<file value="Logs\SomeApplication.xml"/>
<appendToFile value="true"/>
<rollingStyle value="Size"/>
<countDirection value="1"/>
<maxSizeRollBackups value="30"/>
<maximumFileSize value="10MB"/>
<staticLogFileName value="true"/>
<lockingModel type="log4net.Appender.FileAppender+MinimalLock"/>
<layout type="log4net.Layout.XmlLayoutSchemaLog4j">
<locationInfo value="true"/>
</layout>
</appender>
<appender name="SmtpAppender" type="log4net.Appender.SmtpAppender">
<to value="SomeDistributionList#somehost.com"/>
<from value="SomeApplication#somehost.com"/>
<subject type="log4net.Util.PatternString" value="Some Application Error - %property{log4net:HostName}"/>
<smtpHost value="smtp.somehost.com"/>
<bufferSize value="1"/>
<threshold value="ERROR"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date %property{log4net:HostName} %logger %level %newline%newline%property{ExceptionThrottleInformation}%newline%newline%message%newline"/>
</layout>
<filter type="SomeNamespace.SomeSubNamespace.Log4Net.ExceptionThrottleFilter, SomeSubNamespace">
<threshold value="10"/>
<thresholdTimeoutSeconds value="60"/>
<timeoutSecondsBetweenMessages value="600000"/>
<exceptionText value="Timeout expired"/>
</filter>
</appender>
<appender name="DatabaseAppender" type="SomeNamespace.SomeSubNamespace.DatabaseTraceAppender, SomeSubNamespace">
<hoursToKeepInformationalTraces value="48"/>
<hoursToKeepErrorTraces value="96"/>
<threshold value="INFO"/>
</appender>
<root>
<level value="INFO"/>
<appender-ref ref="RollingFileAppender"/>
<appender-ref ref="SmtpAppender"/>
<appender-ref ref="DatabaseAppender"/>
</root>
Note that while I have multiple appenders, I reference which to call within the root tag. Since you didn't post your whole config file, it's tough to tell if everything is matching as it should.

log4net print DateTime/calling class/function on each line

Is there any way using log4net to automatically write date/time and class name/function name to the start of each logged line?

In the log4net configuration file modify Appender section by adding a PatternLayout with custom format. Following pattern will output DateTime ClassName.MethodName
<appender name="DebugOut"
type="log4net.Appender.OutputDebugStringAppender">
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date{MM/dd/yy HH:mm} %C{1}.%M" />
</layout>
</appender>
You can output fully qualified name of class by changing %C{1} to %C

How to Log Console Screen into a Text File? [duplicate]

This question already has answers here:
Closed 12 years ago.
Possible Duplicate:
Mirroring console output to a file
I've a console application in C# and I want to Log into a text file every text appears on the screen. How to do that ?
Unfortunately this thread is closed despite of my comment about the Mirroring console output to a file. The accepted post as answer by that thread IS NOT CORRECT. So why cannot ask the question again? I'm using console interactively and want a copy of all the text on console in a text file. SOS

C:\>yourconsoleapp.exe > yourtextfile.txt
edit: This assumes your console app requires no user input.

Replace all references to the Console class with the System.Diagnostics.Trace class. You can add a ConsoleTraceListener and a TextWriterTraceListener, and then everything you output to the console will end up in both places.

You could use Console.SetOut to redirect the output to a file, but then you wouldn't get output to the console as well unless you used a TextWriter that streamed to both.
You could try using System.Diagnostics.Trace and then adding listeners to both the console and a file.
<configuration>
<system.diagnostics>
<trace autoflush="false" indentsize="4">
<listeners>
<add name="configConsoleListener"
type="System.Diagnostics.ConsoleTraceListener" />
<add name="fileLogger"
type="System.Diagnostics.TextWriterTraceListener"
initializeData="LogFile.log" />
<remove name="Default" />
</listeners>
</trace>
</system.diagnostics>
</configuration>

This may be overly simplistic, but at a command prompt, if you do:
C:\>MyApplication >> output.txt
That will write all output from that given app to output.txt
If you don't actually need a programmatic solution, this might do the trick.

A simple Google search result : here
Sorry I am no longer programming with C# but I checked to code and it does make sense in this approach :)

Use log4j.
Go to log4j website and download dll.
Reference dll in your project.
Add this to top of your app.config
<appender name="FileAppender" type="log4net.Appender.FileAppender">
<file value="log-file.txt" />
<appendToFile value="true" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] -%message%newline" />
</layout>
</appender>
<appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %-5level %logger [%property{NDC}] -%message%newline" />
</layout>
</appender>
Put this as a member of any class you want to log to:
private static readonly ILog log = LogManager.GetLogger(typeof(Foo));
Put in a line like this to log:
log.Debug("Hello world!");