Tweaking log4net Settings Programmatically
A few months ago, I had to dynamically add a log4net appender at runtime. Now I find myself in another log4net situation. I need to modify the configuration of my appenders at runtime.
My client requires all files generated by our applications to be saved to a specific location. This location is determined at runtime. Therefore, I want my FileAppenders to log their data to this specific location – but I won't know the location until runtime so I can't add it to the XML configuration file I'm using.
No problem. Bing is my new friend and returned a couple of hits. I made a few tweaks to their LINQ queries and created a generic extension method for ILoggerRepository (just a hunch that I might want this functionality somewhere else in the future – sorry YAGNI fans):
public static void ModifyAppenders<T>(this ILoggerRepository repository, Action<T> modify) where T:log4net.Appender.AppenderSkeleton
{
var appenders = from appender in log4net.LogManager.GetRepository().GetAppenders()
where appender is T
select appender as T;
foreach (var appender in appenders)
{
modify(appender);
appender.ActivateOptions();
}
}
Now I can easily add the proper directory prefix to all of my FileAppenders at runtime:
log4net.LogManager.GetRepository().ModifyAppenders<FileAppender>(a =>
{
a.File = Path.Combine(settings.ConfigDirectory,
Path.GetFileName(a.File));
});
Thanks
beefycode and
Wil Peck.
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