[LOG4NET-559] Custom Appender throws exception to user when I use %type in ConversionPattern

• Type: Bug
• Status: Resolved
• Priority: Blocker
• Resolution: Fixed
• Affects Version/s: 2.0.7
• Fix Version/s: 2.1.0
• Assignee: Dominik Psenner
• Reporter: Denis Abramov
• Created: 13/Mar/17 22:13
• Updated: 10/Jan/18 23:45
• Resolved: 10/Jan/18 23:45

Description

When I setup my custom appender, I use the following ConversionPattern:

<layout type="log4net.Layout.PatternLayout">
<param name="ConversionPattern" value="%m%n %type" />
</layout>

In my custom appender's "Append()" method, the "RenderLoggingEvent" is throwing the exception below
Here's how I am calling the RenderLoggingEvent method:

protected override void Append(LoggingEvent loggingEvent)

{ ... var text = RenderLoggingEvent(loggingEvent); ... }

Here is the exception I am getting:

System.NullReferenceException was unhandled by user code
HResult=-2147467261
Message=Object reference not set to an instance of an object.
Source=log4net
StackTrace:
at log4net.Layout.Pattern.TypeNamePatternConverter.GetFullyQualifiedName(LoggingEvent loggingEvent) in c:\log4net\tags\2.0.7RC1\src\Layout\Pattern\TypeNamePatternConverter.cs:line 51
at log4net.Layout.Pattern.NamedPatternConverter.Convert(TextWriter writer, LoggingEvent loggingEvent) in c:\log4net\tags\2.0.7RC1\src\Layout\Pattern\NamedPatternConverter.cs:line 125
at log4net.Util.PatternConverter.Format(TextWriter writer, Object state) in c:\log4net\tags\2.0.7RC1\src\Util\PatternConverter.cs:line 173
at log4net.Layout.PatternLayout.Format(TextWriter writer, LoggingEvent loggingEvent) in c:\log4net\tags\2.0.7RC1\src\Layout\PatternLayout.cs:line 1117
at log4net.Appender.AppenderSkeleton.RenderLoggingEvent(LoggingEvent loggingEvent) in c:\log4net\tags\2.0.7RC1\src\Appender\AppenderSkeleton.cs:line 705
at MyAppender.MyAppender.Append(LoggingEvent loggingEvent) in E:\svn\trunk\MyAppender\MyAppender.cs:line 67
at log4net.Appender.AppenderSkeleton.DoAppend(LoggingEvent loggingEvent) in c:\log4net\tags\2.0.7RC1\src\Appender\AppenderSkeleton.cs:line 317
InnerException: