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Asked: 2026-05-24T12:12:40+00:00

I have 5 entities that are loaded using the entity framework. Here they are:

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I have 5 entities that are loaded using the entity framework. Here they are:
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All of the entities are inherited from:
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(Each entity represented by a class with the properties described above. Al entities inherit Transmission entity).
As you can see, there are common properties in some of the entities. But the properties WorkerId, WorkerPersonalId, VehicleId, VehicleNumber, SubcontractorId has special methods for SET so in order to encapsulate the logic of update I created WorkerVehicleTransmission class with those properties setters implementation. Each transmission now uses the WorkerVehicleTransmission.
Now I have a new need. I need to log each property change. For that I have the Log() method. For eaxmple, I need that when the user makes cargoStorage.Weight=8; there will be a call to Log() that will log this change.

Importent issue: I need to find a solution where the creation of an entity (by the entity framework for example) will not log.

How can I integrate the new need?

This question is the real need for the example I ask about here: how to solve this code duplication + add another method

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1 Answer

  1. Editorial Team

    As a start you could attach a handler to the PropertyChanged event in the Transmission base class which will enable you to call the Log method whenever a property changes in any of your sub classes.

    INotifyPropertyChanged.PropertyChanged Event

    This however will fire when any change is made, including when the Entity Framework creates the objects, so is only half way there.

    Edit

    If you create a new property within the Transmission class (a boolean flag) you could use this in your data access object routines to set whether logging should be enabled.

    This flag is only ever set after any Entity Framework activity on each object has been completed therefore the only Property changes logged are those relating to your code.

    Not an elegant solution but I cannot see any other way.

    Edit

    Just had a look at the EntityObject base members and there is an Property (Enumeration) named EntityState.

    EntityObject.EntityState Property

    This property is set to “Detached” when the entity is being created (Unattached to the object context) by the Entity Framework and changes its value to “Added”, “Deleted”, “Modified” or “Unchanged” after it is added (depending on the state of the object).

    By checking if the value is anything other than “Detached” you could then determine whether logging should be enabled.

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