Using Enterprise Library logging application block in NHibernate

Question

Hi all:

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?

Thanks

Answer 1

Why not just let nHibernate use log4net? Yes you have to manage two but otherwise you'd have to write an adapter for log4net to log to EntLibrary.

I use EntLibrary as well, and just deal with Log4Net being there for nHibernate. On their dev discussion group they talked about removing log4net as a depedancy but I don't think any work has been done on it.

Answer 2

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....

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

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

Answer 3

This was something I had been wondering about myself. I can confirm for you that NHibernate has a hard dependency on Log4Net, therefore, you will have to write an appender as Josh noted.