C＃log4net：带空格的DateTimeFormat

Question

I am using the RollingFileAppender(log4net) to log events of 24/7-application in a file. The file name have to be as follows:

"blabla-2012- 3- 6.txt" or "blabla-2012-13- 6" or "blabla-2012- 3-12.txt"

The problem is that I dont know a DateTime format, that would use blanks instead of zero.

RollingFileAppender appender = new RollingFileAppender ();
                 appender.Name = String.Format ("{0} appender_", name);
                 appender.File = string.Format ("{0} {1} {2} {3}", logPath, @ "\", file, name, extension);
                 appender.AppendToFile = true;
                 appender.LockingModel = new FileAppender.MinimalLock();
                 appender.StaticLogFileName = false;
              ->> Appender.DatePattern = string.Format ("yyyy-M-d");
....

Answer 1

You can place literals in the format string:

Appender.DatePattern = "yyyy- M- d"; // don't need string.Format

Does that not work?

Edit: I understand now: You want MM, but instead of "05" you want " 5". DateTime formatting does not have a way to facilitate this. You could create your own derivative RollingFileAppender that tries to handle this special case formatting.

Answer 2

Log4net uses the following to determine the file name in the rolling file appender:

m_scheduledFilename = 
CombinePath(File, m_now.ToString(m_datePattern, System.Globalization.DateTimeFormatInfo.InvariantInfo));

where as you guess m_now is the current datetime. So you can use all DateTime available custom formats , and I think the format you need is not present out of the box. So if you absolutely need such a format you can write a custom appender by deriving it from RollingFileAppender and overriding the RollOverTime method.