c# - Add event to cascade update -

i'm using fluent nhinernate in application cascade option.

i have complex model bunch of entities , relations in it. held 1 entity (contract) has collections of other entities. these entities have references other entities / lists of entities.

when want save whole thing this:

mysession.save(mycontract); mytransaction.commit() 

works fine, saves entities cascade.

the problem need set properties modifiedby, modifiedtime, etc on update. how can this?

the easiest way create interface properties need update:

public interface iaudit {     string modifiedby { get; set; }     datetime modifiedtime { get; set; } } 

and add nhibernateinterceptor update properties:

public class auditinterceptor : emptyinterceptor {     public override bool onsave(object entity, object id, object[] state, string[] propertynames, itype[] types)     {         var auditableentity = entity iaudit;         if (auditableentity != null)         {             auditableentity.modifiedtime = datetime.now;             // ...         }          return base.onsave(entity, id, state, propertynames, types);     } // ... } 

you need tell nhibernate use interceptor if remember correctly done follows:

var session = sessionfactory.opensession(new auditinterceptor()); 

depending on how manage sessions etc depend goes, , since auditinterceptor has no state exist singleton without worry of multi threading issues.