I'm looking to expand my application to perform some better logging. One thing I've done is implement a Log Writer in the Save Interceptor and this will work fine.

 

Right now, however, I'm trying to write entity changes to the database  (think "User Name / Change Type / Before / After"). The User Name is easy enough, as is the change type (EntityState). But, I'm trying to capture Before and After now.

 

If I have an entity, say, "Property", that appears in a call to the EntityManager.FindEntities(EntityState.Modified) method, I get a collection of entities back. But, how is the best way to determine if the "Address" field or the "Phone Number" field has been modified? And, if I can determine it, is there a way to get a before and after state?

 

Looking through the documentation didn't give an answer, and I thought that since DevForce has a "Reject Changes" function on the Entity Manager, it MUST be saved somewhere.

 

Any help would be appreciated.

 

-Jason

 

You could check which property was changed in the PropertyChanged event:

 

     var order = _mgr.Orders.GetFirstOrDefault();
     order.PropertyChanged += (o, e) => {
        _propertyChanged = e.PropertyName;
      };

 

Or you can compare compare the Current and Original property values of an entity to determine what has changed.

To get the Current and Original values you can use GetValue():

 

     var original = order.EntityAspect.GetValue("Freight", EntityVersion.Original);
     var current = order.EntityAspect.GetValue("Freight", EntityVersion.Current);

 

 

  Silvio.

 

-J