Entity Framework in Layered Architectures

Question

Recently I\'ve read article \"The Entity Framework In Layered Architecture\" and there is written we can send EF-entities to client through WCF. But in many threads on Stackover

Answer 1

You can have POCO entities handwritten and completely separated from the persistence layer. SDReys is right, using generated EF entities as your model is smelly.

Here is the rough layout for a simple POCO model and the context to support it.

public class MyApplicationContext : ObjectContext, IMyApplicationContext {   
    public MyApplicationContext() : base("name=myApplicationEntities", "myApplicationEntities")  
    {
  base.ContextOptions.LazyLoadingEnabled = true;
        m_Customers = CreateObjectSet();
        m_Accounts = CreateObjectSet();
    }

 private ObjectSet m_Customers;
 public IQueryable Customers {
        get { return m_Customers; }
    }
 private ObjectSet m_Accounts;
 public IQueryable Accounts {
        get { return m_Accounts; }
    }

 public Account CreateAccount(Customer customer) {
  var account m_Accounts.CreateObject();
  account.Customer = customer;
  return account;
 }
 public Customer CreateCustomer() {
  return m_Customers.CreateCustomer();
 }

 public void AddAccount(Account account) {
  m_Accounts.AddObject(account);
 }
 public void AddCustomer(Customer customer) {
  m_Customers.AddCustomer(customer);
 }
}

public class Account {
    public int Balance {get;set;}
    virtual public Customer{get;set;}
}

public class Customer {
    public string Name {get;set;}
    virtual public List Accounts{get;set;}
}