Detecting field changes to entity

Hello,

I'm using AutoMapper to map data contracts to entities. For some entities, only users and applications with specific roles are allowed to modify certain fields. Suppose I have the following code:

class MyResource {
    public string Name { get; set; }
    public string Secret { get; set; }
}

class MyEntity : Entity<long> {
    public string Name { get; set; }
    public string Secret { get; set; }
}

class MyService {

    IUnitOfWork UnitOfWork { get; set; }

    public MyResource Update(string id, MyResource resource) 
    {
        // find the entity
        Query query = new Query(typeof(MyEntity), Entity.Attribute("Id") == id);
        var entity = UnitOfWork.FindOne<MyEntity>(query);

        // map changes
        Mapper.Map(resource, entity);

        // TODO: How do I determine whether secret was modified or not?

        // Save Changes
        UnitOfWork.SaveChanges();

        // Return result
        var result = Mapper.Map<MyResource>(entity);
        return result;
    }

}

How do I know whether the "Secret" property of Entity was modified (See the TODO comment)?

Thanks, Werner

This maybe? http://www.mindscapehq.com/documentation/lightspeed/Implementing-Storage-Policies-with-LightSpeed/Change-Tracking

As Chadw mentioned, have a look at the Change Tracking infrastructure - this is our mechanism for exposing field level changes within a UnitOfWork scope.

Jeremy