The author discusses importance of logging application activity both during development and after shipping and methods of logging. The logging during development is required since
- Log allows you to understand actions that led to a bug
- Log helps clarify the order of events
- Some bugs only reproduce when running without a debugger
- Some bugs occur after thousands of calls of a function
The author suggests to make it easy for end user to turn logging on or off. The author advises to include following in the logs:
- Error messages and information including stack trace
- The state of internal data structures
- User actions
- The timings of significant actions
- Important environment information
The author then discusses about logging tools including:
- The Trace and Debug classes of .Net framework -
- The EventLog class - This is used to log events to Windows Event Log
- Enterprise Instrumentation Framework
- Logging Application Block
- log4net
If there is no logging included in application, the author discusses about diagnostic tools like System Information to collect information from user machine.
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