Log4Net configuration – LevelMatchFilter

filterlog4netsequence

As there are following levels in log4net

ALL
DEBUG
INFO
WARN
ERROR
FATAL
OFF

Can anyone please tell me in log4net how can I log only INFO & ERROR or DEBUG & ERROR? What I mean here is be able to log two different levels which are not in sequence?

I can't do if I use following because warning messages will be logged as well which I don't want:

<filter type="log4net.Filter.LevelRangeFilter">
    <acceptOnMatch value="true" />
    <levelMin value="INFO" />
    <levelMax value="ERROR" />
</filter>

Best Answer

Use LevelMatchFilter in conjunction with DenyAllFilter:

<filter type="log4net.Filter.LevelMatchFilter">
  <acceptOnMatch value="true" />
  <levelToMatch  value="INFO" />
</filter>
<filter type="log4net.Filter.LevelMatchFilter">
  <acceptOnMatch value="true" />
  <levelToMatch  value="ERROR" />
</filter>
<filter type="log4net.Filter.DenyAllFilter" />

Related Solutions

C# – log4net/c# – Different layout based on the level

This post has a good explanation of a log4net config file:

log4net Configuration

Pay attention to the layout elements in the appenders. They define the pattern for how the error and any information you choose are output.

C# – How to eliminate duplicate logging in log4net

You are getting duplicated because you are telling it to log messages twice. I wouldn't recommend using additivity here since you might experience some side effects, simply remove unnecessary configuration:

<root>
    <level value="WARN" />
    <appender-ref ref="Console" />
    <appender-ref ref="LogFile" />
</root>
<logger name="myprogram">
    <level value="INFO" />
</logger>

You don't need to indicate the appender-ref in the logger myprogram since it will inherit them from the root logger; if you specify them again it will log twice.

Best Answer

Related Solutions

C# – log4net/c# – Different layout based on the level

C# – How to eliminate duplicate logging in log4net

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