What is the difference between domain objects, POCOs and entities?

Question

I was under the impression they are all basically the same. Are model objects also the same?

Right now, in my architecture, I have:

class Person 
{

            


        

Answer 1

A domain object is an entity in the domain layer of your application, eg. an Address class. "Model" means the same thing - an entity in the "Domain Model".

A POCO (plain old CLR object) is an object that has no behaviour (methods) defined, and only contains data (properties). POCO's are generally used as DTOs (data transport objects) to carry data between layers, and the data is then commonly used to populate a domain object/entity.