How do I use a GlobalContext property in a log4net appender name?

I ran into the same behavior and solved it by setting the global variable before calling the XmlConfigurator... Here is what I am successfully using:

log4net.config details:

<appender name="RollingLogFileAppender" type="log4net.Appender.RollingFileAppender,log4net">
  <File type="log4net.Util.PatternString" value="App_Data/%property{LogName}" />
  ...
</appender>

Global.asax details:

private static readonly log4net.ILog log = log4net.LogManager.GetLogger("Global.asax");
void Application_Start(object sender, EventArgs e) 
{
    // Set logfile name and application name variables
    log4net.GlobalContext.Properties["LogName"] = GetType().Assembly.GetName().Name + ".log";
    log4net.GlobalContext.Properties["ApplicationName"] = GetType().Assembly.GetName().Name;

    // Load log4net configuration
    System.IO.FileInfo logfile = new System.IO.FileInfo(Server.MapPath("log4net.config"));
    log4net.Config.XmlConfigurator.ConfigureAndWatch(logfile);

    // Record application startup
    log.Debug("Application startup");
}

Hope this helps...

Add type=log4net.Util.PatternString into File element

The problem( I think) is that you GET(GetLogger) the logger before you set the name and load the config...

Try to do declare the logger like: private static log4net.ILog _pLog and then in the Application_Start do:

void Application_Start(object sender, EventArgs e) 
{
    // Set logfile name and application name variables
    log4net.GlobalContext.Properties["LogName"] = GetType().Assembly.GetName().Name + ".log";
    log4net.GlobalContext.Properties["ApplicationName"] = GetType().Assembly.GetName().Name;

    // Load log4net configuration
    System.IO.FileInfo logfile = new System.IO.FileInfo(Server.MapPath("log4net.config"));
    log4net.Config.XmlConfigurator.ConfigureAndWatch(logfile);

    //Get the loger
    _pLog = log4net.LogManager.GetLogger("Global.asax");

    // Record application startup
    pLog .Debug("Application startup");
}

So the sequence is:

// Set logfile name and application name variables
// Load log4net configuration
// get the logger
// Record application startup

Has the logger been initialized through the global or main method in the application? It could be that the GlobalContext has not been initialize yet.