How to debug Log4Net

If you use Log4Net as log engine for your applications (in my opinion is the best choice), this simple row in application configuration file can save you by a waste of time and probably by a headache too.

When Log4Net doesn’t log anything due to a configuration error it never throw an exception, and this is the expected (and correct) behavior of a log system which should never block an application due to its internal error. Unfortunately when something went wrong it is quite difficult discover the reason if you don’t have a break in your code.

With that configuration instruction Log4Net “logs” its initialization process in output windows and in Trace system.

If you add a trace listener you can also save this output in a file.

Here’s an example:

This is very useful in production environment where Visual Studio is not installed and then an output window is not available.

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