MSDN Magazine - September 2008 - (Page 14)

*]QTL QV\MZIK\Q^M LQIOZIU[ MI[QMZ \PIV aW] M^MZ QUIOQVML category. Filters can be used to limit what log entries get recorded. Formatters can be used to customize how the details of a log entry get serialized to text when being recorded. application, use the Logging Application Block’s API to create log entries programmatically. For example, to log the details of an exception you could create a new LogEntry object in the catch portion of a try/catch block, set the LogEntry’s properties to capture the exception’s details, and log the entry by calling the Logger class’s Write method, passing in the LogEntry instance. The Logging Application Block would then categories, and formatters to determine whether to store the log entry and, if so, how to format it. Log4net is an open-source logging library maintained by the Apache Software Foundation. It is a .NET port of the log4j, a logging library for applications written in Java. Many of the core concepts present in the Logging Application Block are also found in log4net, although different terminology may be used. For example, log entries in log4net are recorded by objects called appenders (rather than trace listeners). Log4net ships with many more appenders than the Enterprise Library. There are appenders for logging to a number of sources, such as an ADO.NET data source, the ASP.NET trace, a console window, the Windows Event Log, a buffer in memory, an 8W_MZN]T Ð M`QJTM IVL MI[a\W][M ,W_VTWIL ?Q\P .]TT ;]XXWZ\ cVReV Tfde`^ Z_eVcRTeZgV UZRXcR^d _Veh`c\ VUZe`cd h`c\W]`hd W]`hTYRced R_U UVdZX_ e``]d 7`c hVS dVcgVcd `c ]`TR] Raa]ZTReZ`_d :e|d VRdj e`fdV R_U gVcj W]ViZS]V HV|cV eYV WZcde UVgV]`aVc `W UZRXcR^^Z_X T`^a`_V_ed R_U deZ]] eYV SVde 7Z_U `fe W`c j`fcdV]W+ U`h_]`RU `fc 7C66 Wf]]j Wf_TeZ`_R] VgR]fReZ`_ \Ze hZeY Wf]] dfaa`ce Re hhh_h``UdT`^ .:-- the application, call the API’s GetLogger method, passing in the name or type of the logger to access. The loggers offer a variety of methods that, when called, create a log entry of a particular level. The levels, which have values such as DEBUG, INFO, WARN, and FATAL, indicate the priority tion you can indicate that certain loggers should only respond to log entries with certain levels. Logging is an important aspect of any application. At a minimum, you should log error details. But logging can also be helpful during debugging and for maintaining an audit trail. The Logging Application Block and log4net are two mature, open-source logging systems that can be used with new .NET-targeted applications or integrated into existing ones. Price: Free. Open source. Enterprise Library 4.0: go.microsoft.com/fwlink/?LinkId=122895 log4net: logging.apache.org/log4net Logging Application Block’s formatters. SCOTT MITCHELL, author of numerous books and where log4net differs from the Logging Application Block (and many other logging systems) is the ability to create a hierarchy of loggers. To log information from within founder of 4GuysFromRolla.com, is an MVP who has been working with Microsoft Web technologies since 1998. Scott is an independent consultant, trainer, and writer. Reach him at Mitchell@4guysfromrolla.com or via his blog at ScottOnWriting.NET. Toolbox 14 msdn magazine V_WWL[KWU http://go.microsoft.com/fwlink/?LinkId=122895 http://logging.apache.org/log4net http://www.nwoods.com http://www.nwoods.com http://4GuysFromRolla.com http://ScottOnWriting.NET

Table of Contents Feed for the Digital Edition of MSDN Magazine - September 2008

MSDN Magazine - September 2008 Contents Toolbox CLR Inside Out Data Points Advanced Basics Office Space Cutting Edge Hierarchy ID New Features for Microsoft SQL Server 2008 Prism Data Services Advanced WPF Test Run Security Briefs Foundations { End Bracket }

MSDN Magazine - September 2008

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