By default, all logs are printed to logs without any filters. You can choose to write logs that match words or loggers or level ranges.
This must be configured in Log4Net.config file of your application. Following is the sample config file:
<?xml version="1.0"?>
<configuration>
<configSections>
<section name="log4net" type="log4net.Config.Log4NetConfigurationSectionHandler, log4net"/>
</configSections>
<log4net>
<appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date{ABSOLUTE} [%thread] %level %logger - %message%:Extra Info: %property{testProperty}%:%exception%newline"/>
</layout>
</appender>
<appender name="RollingFileAppender1" type="log4net.Appender.RollingFileAppender">
<file value="C:\Tetherfi\TetherfiHome\Logs\TMACWorkQueue\WQ.log"/>
<appendToFile value="true"/>
<rollingStyle value="Size"/>
<maxSizeRollBackups value="5"/>
<maximumFileSize value="2MB"/>
<staticLogFileName value="true"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %level %logger - %message%:%exception%newline"/>
</layout>
</appender>
<appender name="RollingFileAppender2" type="log4net.Appender.RollingFileAppender">
<file type="log4net.Util.PatternString" value="E:\GIT\WorkQueue\Server\Logs\WQClient.log"/>
<appendToFile value="true"/>
<rollingStyle value="Size"/>
<maxSizeRollBackups value="5"/>
<maximumFileSize value="5MB"/>
<staticLogFileName value="true"/>
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%date [%thread] %level %logger - %message%:%exception%newline"/>
</layout>
<lockingModel type="log4net.Appender.FileAppender+MinimalLock"/>
</appender>
<root>
<level value="ALL"/>
<appender-ref ref="RollingFileAppender1"/>
</root>
<logger name="TetherfiWorkAssignmentClient.WorkItemManager" additivity="false">
<level value="ALL"/>
<appender-ref ref="RollingFileAppender2"/>
</logger>
</log4net>
</configuration>
"<filter>" tag blocks must be added the following xml block under "appender" tag. Following are the examples:
Logger Filter
<filter type="log4net.Filter.LoggerMatchFilter">
<loggerToMatch value="TetherfiWorkAssignment.Processor"/>
<acceptOnMatch value="false"/>
</filter>
Each logger corresponds to a namespace and class of an application. In the sample XML provided, There is one logger "TetherfiWorkAssignmentClient.WorkItemManager" defined which will be written to a separate file. Rest all will be written to another file which is defined under "root" tag. In "root" tag, if you want to match logs of a logger and not write it, you can use the above block. This will reject all logs coming from logger "TetherfiWorkAssignment.Processor".
Search Filter
<filter type="log4net.Filter.StringMatchFilter">
<stringToMatch value="GenericTimerOnElapsed"/>
<acceptOnMatch value="false"/>
</filter>
This filter allows you to filter by search word. This is a 'contains' operation. With this block, all logs having the word "GenericTimerOnElapsed" will not be written.
Level Range Filter
<filter type="log4net.Filter.LevelRangeFilter">
<param name="LevelMin" value="INFO"/>
<param name="LevelMax" value="ERROR"/>
</filter>
This filter specifies to write logs of minimum type "INFO" and maximum type "ERROR". This means types below INFO such as DEBUG and types above ERROR such as FATAL will not written.
Deny All Filter
<filter type="log4net.Filter.DenyAllFilter"/>
This will reject all logs from writing. This is used in a switch-like scenario. If you want to write logs only from two loggers only, you can add two of "Logger Filter" block, and change value of "loggerToMatch"and "acceptOnMatch" to true. In addition to this, you would want to reject rest of the logs from other loggers. You can then include "Deny All Filter". This is the same for Search Filter. Remember, by default all logs are printed, which is why this is required to prevent logs which does not match any filters. For example:
<filter type="log4net.Filter.StringMatchFilter">
<stringToMatch value="MyFirstPhrase"/>
<acceptOnMatch value="true"/>
</filter>
<filter type="log4net.Filter.StringMatchFilter">
<stringToMatch value="MySecondPhrase"/>
<acceptOnMatch value="true"/>
</filter>
<filter type="log4net.Filter.DenyAllFilter"/>
This will write logs which contains words "MyFirstPhrase" and "MySecondPhrase" and reject rest of the logs.
