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Transforming events

Prerequisites:
Transforming extensions allows a particular ILog instance to modify some of incoming log events.

Transform log level

Transform log levels of incoming log events according to provided mapping:
log = log.WithLevelsTransformation(
new Dictionary<LogLevel, LogLevel>
{
[LogLevel.Error] = LogLevel.Warn,
[LogLevel.Fatal] = LogLevel.Warn
});
Transform error log level of incoming log events to warning level:
log = log.WithErrorsTransformedToWarns();