Formatting in non-log lines in log4net

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I would like to make some adjustments to the the name of the file and the header/footer sections of the log file in my FileAppender logger.

Given the following config section:

XML

<appender name="FileAppender" type="log4net.Appender.FileAppender">
  <file value=".\ImportLog.log"/>
  <appendToFile value="true"/>
  <layout type="log4net.Layout.PatternLayout">
    <param name="Header" value="== Begin Processing ===================="/>
    <param name="Footer" value="== Completed Processing ================"/>
    <conversionPattern value="%date{HH:mm:ss},%message,%-5level,%logger%newline"/>
  </layout>
</appender>

I tried to do this:

<file value=".\%date{HHmmss}ImportLog.log"/>

...but my filename was literally "%date{HHmmss}ImportLog.log".

I want my header and footer to have a line space above and below them, so I tried this:

XML

<param name="Header" value="== Begin Processing ====================%newline"/>
<param name="Footer" value="== Completed Processing ================%newline"/>

...but I just get the text "%newline" after those lines. In this instance, \r\n also appear as literals.

Is there a way to template or (modify at runtime) these non-log lines?

Posted 22-Sep-10 8:47am

TheyCallMeMrJames

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TheyCallMeMrJames 22-Sep-10 14:48pm

btw...I tried to use the tags 'logging' or 'log4net', which don't exist, so if someone has the power, might those be good tags?

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TheyCallMeMrJames · Answer 1 · 2010-09-22T09:07:00

Found a solution[^]: derive from PatternLayout.

I ended up doing this:

C#

public class TimestampedPatternLayout : PatternLayout
{
    public override string Header
    {
        get
        {
            string result = "== Processing Started ({0}) ==============\r\n";
            result = string.Format(result, DateTime.Now.ToString("HH:mm:ss"));
            return result;
        }
        set { }
    }
    public override string Footer
    {
        get
        {
            string result = "== Processing Ended ({0}) ================\r\n";
            result = string.Format(result, DateTime.Now.ToString("HH:mm:ss"));
            return result;
        }
        set { }
    }
}

Which also simplified my config:

XML

<appender name="FileAppender" type="log4net.Appender.FileAppender">
  <file value=".\ImportLog.log"/>
  <appendToFile value="true"/>
  <layout type="Engage.ImportLegacy.TimestampedPatternLayout">
    <conversionPattern value="%date{HH:mm:ss},%message,%-5level,%logger%newline"/>
  </layout>
</appender>

Cheers.