Using Enterprise Library logging application block in NHibernate

Question

We are trying to integrate NHibernate as our OR/M, however, we are currently using Enterprise Library's logging application block. I know that NHibernate uses log4net to log. Does anyone have any example on how to use Enterprise Library to log NHibernate related logs?

Answer 1

Write your own log4net appender that writes to a EL logger. It's an adapter pattern.

inherit a new/custom appender class from log4net.Appender.AppenderSkeleton

override the Append event handler from the skeleton class, and in it show the RenderedMessage, something like this:

using System;
using log4net;
using System.Windows.Forms;

namespace MyAppender
{
    public class CustomAppender : log4net.Appender.AppenderSkeleton
    {
        protected override void Append(log4net.spi.LoggingEvent log)
        {
            // log to EL logger based on log properties.
        }
    }
}

you then need to configure log4net config file....

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
    <log4net>
        <appender name="MyAppender" type="MyAppender.CustomAppender,CustomAppender">
            <threshold value="DEBUG"/>
        </appender>

        <root>
            <level value="DEBUG" />
                <appender-ref ref="MyAppender" />
        </root>
    </log4net>
</configuration>

I have not tested this, but it should get you going.