log4net: different logs on different file appenders at runtime

Question

Good morning guys.

I wrote a single istance C# 2.0 app (call it myapp).
Myapp is called many times, and at every call generates a sort of \"task\" that will

Answer 1

I've done something similar, where I needed a different log for every instance of a class. You can create logs dynamically with a few steps.

It looks like a default Logger (Line 97) is already defined, but it's internal to their assembly, so it will need to be inherited (as far as I know).

public sealed class DynamicLogger : Logger 
{ 
    internal DynamicLogger(string name) : base(name) 
    { 
        base.Hierarchy = (log4net.Repository.Hierarchy.Hierarchy)LogManager.GetRepository();
    } 
}

Sample method to retrieve an ILog:

public static ILog GetSample(string arg)
{
    var logger = new DynamicLogger(arg);
    logger.Level = Level.All;

    var consoleAppender = new ConsoleAppender();
    consoleAppender.Name = arg;
    consoleAppender.Layout = new PatternLayout(arg + ": %m%newline");
    logger.AddAppender(consoleAppender);

    var newLog = new LogImpl(logger);
    if (_logs.Any(log => log.Logger.Name == newLog.Logger.Name) == false)
        _logs.Add(newLog);

    return newLog;
}

Basic usage:

var foo = DynamicLog.GetSample("foo");
var bar = DynamicLog.GetSample("bar");
foo.Error("Test");
bar.Error("Test");

For your scenario, look at creating a RollingFileAppender, and look at the available properties on the object, since this was just an example.

EDIT: Added the below for storing ILog's, and modified the original GetSample method above.

Add an array of ILog's and a GetLogger method:

private static List _logs = new List();

public static ILog GetLogger(string name)
{
    return _logs.SingleOrDefault(a => a.Logger.Name == name);
}

Sample usage:

DynamicLog.GetSample("foo");
var foo = DynamicLog.GetLogger("foo");