I want to put an appender section in another file than my main log4net config file.
The goal is to allow me to publish my application with a log4net.config but not erase some customers specific information like smtp parameters.
THe idea is to have :
<logger name="DatabaseLogger">
<level value="ALL" />
<appender-ref ref="AdoNetAppender" />
<appender-ref ref="SmtpAppender" />
</logger>
<appender configSource="log4netsmtp.config"/>
the log4netsmtp.config is build by the customers for security reasons (with my help) and never change by me.
Sorry for my english and thanks you to read me.
Regards
You can load it through Assembly's GetManifestResourceStream to get your file and treat it like an xml, then to init your logger you can use the log4net.config.XmlConfigurator class and pass to it you XmlElement instance or append your XmlElement to an existing log4net xml configuration:
Assembly a = Assembly.GetAssembly(this.GetType());
Stream stream = a.GetManifestResourceStream("MyAssembly.ConfigFolder.logger.config");
XmlDocument xmlDoc = new XmlDocument();
xmlDoc.Load(stream);
// eventually append, modify, merge, check the xml with other info
XmlConfigurator.Configure(xmlDoc);
Related
i am upgrading from log4j to log4j2 and new to log4j in general. I am finding it difficult to introduce lengthy loggers for every class file in the log4j2.properties file. For instance, if i had to create a new logger in log4j, it would be as simple as introducing a single line in the log4j.properties file compared to a whole block of properties against the same logger.
Ex:- If i have to add a logger for a class2 in package A, i would simply add it as follows :-
log4j.logger.A.Class1= DEBUG,file
log4j.logger.A.Class2 = DEBUG,file.
I can easily add another logger by simply introducing a third line in the log4j.properties file.
Whereas, if i have to do the same thing, i would have to add the loggers as below :-
loggers=file1,file2
logger.file1.name=A.Class1
logger.file1.level = debug
logger.file1.appenderRefs = file
logger.file1.appenderRef.file.ref = LOGFILE
logger.file2.name=A.Class2
logger.file2.level = debug
logger.file2.appenderRefs = file
logger.file2.appenderRef.file.ref = LOGFILE
So, if i have 100 classes the log4j2.properties file would be quite lengthy. Unlike if i had to do the same thing in log4j. Please note the prefix of file1, file2, etc.
Question is, is there a way i can write the logger the same way as i did in log4j? Or, is there a simpler way to achieve the same?
If above is not possible, i might as well stick to log4j. Cause it becomes a serious trouble for me to create loggers for each class in large projects.
Thanks in advance.
Take a look at the Log4J2 XML configuration file format with which it will suffice to add one single line to configure logging for a class. This provided that you are content with writing all the log to one and the same destination, otherwise more than one line per class may be required.
Example:
<?xml version="1.0" encoding="UTF-8" ?>
<Configuration>
<Appenders>
<Console name="CONSOLE" target="SYSTEM_OUT">
<PatternLayout pattern="%d %-5p %-30C - %m%n" />
</Console>
</Appenders>
<Loggers>
<Logger name="se.ivankrizsan.java.MyClass" level="DEBUG"/>
<Logger name="org.springframework" level="INFO"/>
<Root level="INFO">
<AppenderRef ref="CONSOLE" />
</Root>
</Loggers>
</Configuration>
Note also that you can specify the log-level for entire packages and thus multiple classes at once as with the org.springframework package in the above example.
Reference: Log4J2 XML configuration documentation.
I have an app where sometimes I'd like to log in Debug mode. Unfortunately i link with a third party lib that I can't rebuild. It was built to use log4net and on the Debug mode it is very verbose.
I don't want to get any notifications from that library. I do however want to get log notifications from all other code that wants to write.
Is there a way to exclude a namespace or library from logging when using either the SMTPAppender or RollingFile Appender writers?
You could use a filter, e.g.
<filter type="log4net.Filter.LoggerMatchFilter">
<!-- allows this sub-namespace to be logged... -->
<loggerToMatch value="Noisy.Namespace.But.Important" />
</filter>
<filter type="log4net.Filter.LoggerMatchFilter">
<!-- ...but not the rest of it -->
<loggerToMatch value="Noisy.Namespace" />
<acceptOnMatch value="false" />
</filter>
More details from this article.
Im imagine that you are using a configuration where you set only the root level of your logging infrastructure:
<root>
<level value="DEBUG" />
<appender-ref ref="A1" />
</root>
However it is possible to define other levels of logging using the logger names. If you or the third party app followed standard practices, your loggers are named after the class they live with its namespace, so you will have loggers called
MyApp.Main
MyApp.Business
MyApp.Business.Messages
ThirdParty.API
etc...
What you can do in this case is declare the logging at the namespace level you're interested in. For example to log only what lives under MyApp.Main add the following
<logger name="MyApp.Main">
<level value="DEBUG" />
<appender-ref ref="A1" />
</logger>
and remove any appender from the root level. Then you only log the loggers that live under the MyApp name. See the documentation for more info.
If you are unlucky and the loggers don't conform to this hierarchy, you can still filter them out by using a LoggerMatchFilter in your appender; this lets you either define what logger can pass, or what loggers cannot. There are lots of filters, feel free to explore them
pardon if the question is too trivial. I am completely new to log4j. I have seen that there are two tags and tags, which refer to various appenders.
Say i want to log the information in my code base in a file, send it to my email and print it to console. I want the level set to info. Isnt it enough to have a single tag which has references to the three appenders ?( file, email and the console) why do we need another for the same ?
It is enough.
In log4j a logger is associated with a package or sometimes with a particular class. Package/class of a logger is defined by the attribute "name". A logger logs messages in its package and also in all the child packages and their classes. The only exception is the root logger that logs messages for the all classes in the application.
A logger also has level and may have one or many appenders (logging destinations) attached to it.
In the next example we have two loggers:
the root logger that logs messages with level INFO or above in the all packages to the various destinations: console, e-mail and file,
"com.foo" logger that logs messages with level WARN or above in package "com.foo" and its child packages to the another file.
<log4j:configuration>
<!-- Declaration of appenders FILE, MAIL, CONSOLE and ANOTHERFILE -->
...
<!-- -->
<logger name="com.foo">
<level value="warn"/>
<appender-ref ref="ANOTHERFILE" />
</logger>
<root>
<priority value ="info" />
<appender-ref ref="FILE" />
<appender-ref ref="MAIL" />
<appender-ref ref="CONSOLE" />
</root>
</log4j:configuration>
You should read more about the log4j basics.
I'm writing a simple test project to experiment with log4net and I've hit a wall right off the bat. No matter what I do in my config file, the my logger is initialized with all "IsXXXXEnabled" flags set to false. Here is my very simple app.config:
<log4netgroup>
<log4net xsi:noNamespaceSchemaLocation="http://csharptest.net/downloads/schema/log4net.xsd"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<appender name="EventLogAppender" type="log4net.Appender.EventLogAppender">
<param name="LogName" value="Application" />
<param name="ApplicationName" value="HelloProgram" />
<threshold value="DEBUG"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%logger - %newline%message" />
</layout>
</appender>
<root>
<level value="DEBUG" />
<appender-ref ref="EventLogAppender" />
</root>
<logger name="HelloLogger">
<level value="DEBUG" />
<appender-ref ref="EventLogAppender" />
</logger>
</log4net>
</log4netgroup>
Here is the trivial test in Main:
ILog Log = LogManager.GetLogger("HelloLogger");
if(Log.IsErrorEnabled)
Console.WriteLine("The logger is working!");
else
Console.WriteLine("Nope");
The output is "Nope". I tried switching the threshold and level values to "ALL", but nothing changed. This seems so simple, what am I missing to enable everything?
Thanks
Fixed it! I don't know why this call is not mentioned in the log4net manual or why I specifically need it, but adding this assembly to my project enabled all log levels:
[assembly:XmlConfigurator(Watch = true)]
Found here:
How do I configure log4net so that log.IsDebugEnabled is true?
You should configure the root logger:
<root>
<level value="DEBUG" />
<appender-ref ref="EventLogAppender" />
</root>
Any non-root loggers (the ones you create with <logger name="...">) apply only to classes whose namespace-qualified name has the logger name as a prefix. So the logger you have created will only apply to a classes that is outside of a namespace and whose name is HelloLogger, or to any classes residing in a namespace called HelloLogger (and possibly within namespaces nested inside that one). (When I say that a logger "applies to" a class X, I mean that that that's the logger you will get when you call LogManager.GetLogger(typeof(X)).)
Edit: You also need to call log4net.Config.XmlConfigurator.Configure(); in order to get log4net to read App.config. Also, delete the outermost <log4netgroup> element and rename the config section name: <section name="log4net" .../>.
Configuring the root logger is not strictly necessary, but the argument of Aasmund is certainly valid. I think the problem is that you try to use the EventLogAppender. For simple tests you should use the ConsoleAppender as this is probably the simplest appender that you can make work in a console application.
The EventLogAppender requires some additional steps to setup: You need to create an event source and that requires administrative rights. The Appender attempts to do this on the fly, but it usually fails silently if UAC is turned on. To see if that is a problem you can try to turn on internal debugging.
Usually you would create an event source with an installation program.
If you are using a separate configuration file for log4net, do this: after following all the other setup instructions, make sure that u right click on the file in the visual studio solution explorer, select properties, expand the "Advanced" option group, set the "Copy To Output Directory" value as "Copy always". That will do the magic... :) cheers!!
I am using log4net in my c# application i have different logger which insert text lines in my single log file.
But now i wanted to add a new logger which should not post log entries in the same file rather i should log in a different file so i configured a new fileAppender, After doing whatever i found on the net i am able to create a different file for my new logger but it echoes the same value in first log file too.
so please if anybody knows about the use of LogFilters so that i could add "Logger <> New logger " match in previously configured appender.
Regards
Mubashar
Assuming you have your "special" logger like this:
ILog logger1 = LogManager.GetLogger("namespace.special_class");
then you can configure log4net as follows:
<logger name="namespace.special_class" additivity="false">
<appender-ref ref="RollingFileAppender4SpecialMessages" />
</logger>
<root>
<level value="ALL" />
<appender-ref ref="StandardRollingFileAppender" />
</root>
This way your special class will use its own file appender. If you need the log messages from this class in your normal log file, then you need to remove the "additivity" attribute.