Microsoft Unity XML configuration for Interception

I've been trying to configure interception for Unity (I want to log to log4net before and after object method calls).

I've used this example:

http://www.codeproject.com/KB/architecture/UnityAOPNHibernate.aspx

and its similar to this answer:

Microsoft Unity - code to xml

but I get "Unrecognized element 'extensionConf开发者_运维技巧ig'." - on the line where it does GetSection("unity") below.

        IUnityContainer unityContainer = new UnityContainer();
        var configurationSection = 
          (UnityConfigurationSection)ConfigurationManager.GetSection("unity")

Please help

---

You need to add a section extention for this to work

<unity xmlns="http://schemas.microsoft.com/practices/2010/unity">
<sectionExtension type="Microsoft.Practices.Unity.InterceptionExtension.Configuration.InterceptionConfigurationExtension, Microsoft.Practices.Unity.Interception.Configuration"/>
...

Refer page 60 of Unity20.PDF for the documentation