In one of my C# Windows Forms Applications I had a problem whereby a third-party component was throwing an exception in another thread. The exception wasn’t causing any problems but it wasn’t being handled by anything.
I started by adding event handlers to the exception events:
Application . ThreadException += Application_ThreadException ;
Application . SetUnhandledExceptionMode ( UnhandledExceptionMode . CatchException ) ;
AppDomain . CurrentDomain . UnhandledException += CurrentDomain_UnhandledException ;
And then I added log4net to simply log the error and move on (added via NuGet Package Manager)
So my app.config had the following added:
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<configSections>
<section name ="log4net" type ="log4net.Config.Log4NetConfigurationSectionHandler,Log4net" />
</configSections>
<log4net>
<root>
<level value ="DEBUG" />
<appender-ref ref ="LogFileAppender" />
</root>
<appender name ="LogFileAppender" type ="log4net.Appender.RollingFileAppender" >
<param name ="File" value ="C:\WebRotator\log.txt" />
<param name ="AppendToFile" value ="true" />
<rollingStyle value ="Size" />
<maxSizeRollBackups value ="10" />
<maximumFileSize value ="1MB" />
<staticLogFileName value ="true" />
<layout type ="log4net.Layout.PatternLayout" >
<param name ="ConversionPattern" value ="%d{yyyy-MM-dd hh:mm:ss} - %-5p - %m%n" />
</layout>
</appender>
</log4net>
And my main Program.cs ended up looking like this:
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static class Program
{
public static readonly ILog Logger = LogManager . GetLogger ( typeof ( Program ) ) ;
[ STAThread ]
static void Main ( )
{
XmlConfigurator . Configure ( ) ;
Application . ThreadException += Application_ThreadException ;
Application . SetUnhandledExceptionMode ( UnhandledExceptionMode . CatchException ) ;
AppDomain . CurrentDomain . UnhandledException += CurrentDomain_UnhandledException ;
Application . EnableVisualStyles ( ) ;
Application . SetCompatibleTextRenderingDefault ( false ) ;
Application . Run ( new frmRotator ( ) ) ;
}
static void CurrentDomain_UnhandledException ( object sender , UnhandledExceptionEventArgs e )
{
LogException ( "CurrentDomain_UnhandledException" , ( Exception ) e . ExceptionObject ) ;
}
static void Application_ThreadException ( object sender , ThreadExceptionEventArgs e )
{
LogException ( "Application_ThreadException" , e . Exception ) ;
}
private static void LogException ( string exceptionArea , Exception e )
{
Logger . ErrorFormat ( "{0}: {1}" , exceptionArea , e ) ;
}
}
Job done!
