Using Logger Filter with Not Equal condition Log4net

Using Logger Filter with Not Equal condition Log4net

By : Sam Zobel
Date : November 22 2020, 07:01 PM
I wish did fix the issue. I am using log4net in my c# application i have different logger which insert text lines in my single log file. , Assuming you have your "special" logger like this:
code :

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Can you filter on Logger level in log4net

Can you filter on Logger level in log4net

By : Abhay
Date : March 29 2020, 07:55 AM
hope this fix your issue Filters are for use with appenders only. If you need to filter out events for several appenders you can pre-filter using a forwardingappender. This way you avoid having to copy and paste the same filter on several appenders.
Your example would look like this:
code :
<appender name="screeningAppender" type="log4net.Appenders.ForwardingAppender">
    <filter type="log4net.Filter.StringMatchFilter">
            <stringToMatch value="do not log me" />
            <acceptOnMatch value="false" />

    <appender-ref ref="file" />
    <appender-ref ref="debug" />

<logger name="MyLogger.WebServices">
    <level value="Debug" />
    <appender-ref ref="screeningAppender" />
C# Static Readonly log4net logger, any way to change logger in Unit Test?

C# Static Readonly log4net logger, any way to change logger in Unit Test?

By : Justin Reich
Date : March 29 2020, 07:55 AM
With these it helps While log4net recommends this pattern, nothing prevents you from instantiating the logger outside the class, and inject it. Most of the IoCs can be configured to inject one and the same instance. That way, for your unit tests you can inject a mock.
I would recommend a wrapper around LogManager.GetLogger, which returns always one and the same logger instance per type:
code :
namespace StackOverflowExample.Moq
    public interface ILogCreator
        ILog GetTypeLogger<T>() where T : class;

    public class LogCreator : ILogCreator
        private static readonly IDictionary<Type, ILog> loggers = new Dictionary<Type, ILog>();
        private static readonly object lockObject;

        public ILog GetTypeLogger<T>() where T : class
            var loggerType = typeof (T);
            if (loggers.ContainsKey(loggerType))
                return loggers[typeof (T)];

            lock (lockObject)
                if (loggers.ContainsKey(loggerType))
                    return loggers[typeof(T)];
                var logger = LogManager.GetLogger(loggerType);
                loggers[loggerType] = logger;
                return logger;

    public class ClassWithLogger
        private readonly ILog logger;
        public ClassWithLogger(ILogCreator logCreator)
            logger = logCreator.GetTypeLogger<ClassWithLogger>();

        public void DoSomething()

    public class Log4Net
        public void DoSomething_should_write_in_debug_logger()
            var logger = new Mock<ILog>();
            var loggerCreator = Mock.Of<ILogCreator>(
                c =>
                c.GetTypeLogger<ClassWithLogger>() == logger.Object);

            var sut = new ClassWithLogger(loggerCreator);


            logger.Verify(l=>l.Debug("called"), Times.Once());
Registering Log4Net Named Logger with Autofac next to Log4Net Module

Registering Log4Net Named Logger with Autofac next to Log4Net Module

By : infinitehz
Date : March 29 2020, 07:55 AM
like below fixes the issue Currently I am using the Log4Net module to register my logger instances using AutoFac: , By doing
code :
public class StatisticsLogger : IStatisticsLogger 
    public StatisticsLogger(ILog logger)
            this._logger =  logger; 
    private readonly ILog _logger; 

    // implements ILog 
    public virtual void Info(Object message)

    // etc. 
                .WithParameter("logger", LogManager.GetLogger("Statistics"))
public class StatisticsLogger : LogImpl, IStatisticsLogger
    public StatisticsLogger(ILogger logger) : base(logger)
    { }
                .WithParameter("logger", LogManager.GetLogger("Statistics").Logger)
Yet another log4net configuration issue. Root logger (or single, named logger) with different thresholds

Yet another log4net configuration issue. Root logger (or single, named logger) with different thresholds

By : Saty
Date : March 29 2020, 07:55 AM
I hope this helps . I have a C# Framework 4.5.2 project, using log4net v2.0.8 (installed via NuGet), and I've read at least ten different but similar questions, and none of them have solved my issue. Sure, I can write successfully to my log appenders, but the filtering/threshold isn't working. I have a single logger (either using ROOT, or a named instance) and have set different thresholds/filters that should direct the actual logging to use a specific appender (i.e. file, db, smtp, etc). This way, a certain level of filter value might only get handled by a single appender. For testing, I'm simply trying to get the Warning and above thresholds to use the ADO appender, while the file appender logs the Info (and above) threshold. So, when I test an Info log method, it shouldn't end up in the db, but it always does. So, somehow I have the configuration wrong. Here are just a couple that I've looked through, and they have given me insight, but not a solution: , I see two things. First, It's WARN, not Warning.
code :
<filter type="log4net.Filter.LevelMatchFilter">
    <levelMin value="WARN" />
    <levelMax value="Fatal" />
  <level value="ALL" />
  <appender-ref ref="LogFileAppender" />
  <appender-ref ref="AdoNetAppender" />
Dependency on Log4Net Logger and Retrieve Logger by Caller Type using Castle Windsor

Dependency on Log4Net Logger and Retrieve Logger by Caller Type using Castle Windsor

By : JamesB
Date : March 29 2020, 07:55 AM
around this issue You do not need to register CommonLog. Your sub dependency resolver can new one up for you.
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