Have Geek Brain

Configuring log4net applications via XML file * and * code

I started playing with log4net today and still, I really like it. To preserve our current logging functionality, each time the application starts, the application must create a new log file. The log file name has a date / time stamp encoded in it. I currently have log4net configured with XmlConfigurator

, which works great, except that the filename for mine is RollingFileAppender

hardcoded in the config config file.

I would keep using XmlConfigurator

, but after the call, Configure()

I want to get RollingFileAppender

and, in code, change its file value as a dynamically generated string. The sample documentation online doesn't seem to be working right now, but I poked through the SDK link and it looks like I could use Heirarchy

and GetAppenders()

do what I need. Am I on the right track?

Ok I took a hit on this and tried the following code which didn't work:

private static readonly ILog _log = LogManager.GetLogger(typeof(GUI));
// in the config file, I've set the filename to example.log, and it works
XmlConfigurator.Configure(new FileInfo("log_config.xml"));
Hierarchy hierarchy = LogManager.GetRepository() as Hierarchy;
if(hierarchy != null) {
    // get the appenders
    IAppender[] appenders = hierarchy.GetAppenders();
    // change the filename for the RollingFileAppender
    foreach( IAppender a in appenders) {
        RollingFileAppender rfa = a as RollingFileAppender;
        if(rfa == null)
            continue;
        rfa.File = "newfile.log"; // no runtime error, but doesn't work.
    }
}
_log.Info("Application started");
+2


a source to share


2 answers


Do you need a copied appender file in this case? If I didn't expect your code to produce the desired output if you were using a regular appender.



Edit: It might be working with RollingFile app if you call ActivateOptions()

in app.

+2


a source


Try this snippet:

XmlConfigurator.Configure();

log4net.Repository.ILoggerRepository repo = LogManager.GetRepository();
foreach (log4net.Appender.IAppender appender in repo.GetAppenders())
{
if (appender.Name.CompareTo("RollingFileAppender") == 0 && appender is log4net.Appender.RollingFileAppender)
{
   var appndr = appender as log4net.Appender.RollingFileAppender;
   string logPath = "MyApplication.log";
   appndr.File = logPath;
   appndr.ActivateOptions();
}


I posted a similar article here

+8


a source






More articles:


All Articles