How to disable creation of empty log file on app start?

Question

I have configured log4net in my app successfully but one thing is a little bit annoying for me.

The log file is created (empty) after my app start even if no error o

Answer 1

The following worked for me.The first call to OpenFile() occurs when the logger is configured. Subsequent calls are when actual log message is generated.

class CustomFileAppender : RollingFileAppender
{
    private bool isFirstTime = true;
    protected override void OpenFile(string fileName, bool append)
    {
        if (isFirstTime)
        {
            isFirstTime = false;
            return;
        }

        base.OpenFile(fileName, append);
    }
}

And in the config file, change the appender

...

The sequence from log4Net source is as below:

---

• The first call to OpenFile() is because of ActivateOptions() called from FileAppender's constructor.
• When log message is generated, AppenderSkeleton's DoAppend() calls PreAppendCheck()
• PreAppendCheck() is overridden in TextWriterAppender, the base of FileAppender.
• The overridden PreAppendCheck() calls virtual PrepareWriter if the file is not yet open.
• PrepareWriter() of FileAppender calls SafeOpenFile() which inturn calls OpenFile()