PostSharp.Samples / PostSharp.Samples.Audit.Extended
Project Description

This example demonstrates how to extend the default Audit logging back-end so that the audit records contains pieces of information that are not provided by the default implementation.

In this example, we corrate the audit record not only to the primary business object, but also to all business objects related to this operations, i.e. to all business objects passed as parameters for this operation.

The ExtendedAuditRecord class extends the AuditRecord class with a field exposing related business objects.

The extended audit back-end is implemented by the ExtendedAuditBackend class which derives from AuditBackend and simply overrides the CreateRecordBuilder method. This method returns a instance of the new ExtendedAuditRecordBuilder class, derived from AuditRecordBuilder.

In the ExtendedAuditRecordBuilder class, we override the CreateRecord method that it returns a new instance of our ExtendedAuditRecord class instead of the default AuditRecord. We then override the SetParameter method and add the parameter to the ExtendedAuditRecord if it's value is a business object.

In this example, we've added audit to the PurchaseOrder.AssignTo(Employee) method by adding the [Audit] aspect.

Whenever an audited method is executed, the AuditServices.RecordPublished event is signaled. An application should subscribe to this event and write all relevant pieces of information to the audit database table. The event arguments now exposes an ExtendedAuditRecord instead of the default AuditRecord.

In this sample, the DbAuditRecord class simulates a database entity. In a real-world example, you would write the audit record and its relationships into a database table.


Adding Audit to Your Solution.