实体框架 – DDD,实体框架,聚合实体行为(Person.AddEmail等)

说我有一个ASP.NET MVC 3网站创建/操纵一个人.控制器访问应用程序服务层(PersonService),后者又使用域实体(EF 4 POCO)和PersonRepository进行更改并持久化.为了简单起见,我在这里省略了所有的界面.在这种情况下,人是根,为了简单起见,只有电子邮件地址(也假定电子邮件不是不可变的,可以更新).

选项1：
尝试坚持使用DDD的基础知识,其中与实体直接相关的行为实现为实体的一部分(Person实现AddEmail,ChangeEmail等).唯一的问题是,除了Add *方法之外,Person将需要知道上下文或实体框架(将删除任何持久性无知)或需要使用“服务”或存储库来标记电子邮件已修改.

// Person Service
public class PersonService {
    // constructor injection to get unit of work and person repository...
    // ...methods to add/update a person
    public EmailAddress AddEmailAddress(int personId,EmailAddress email)
    {   
        Person p = personRepository.Find(p => p.Id == personId).First();
        p.AddEmail(email);   
        uow.SaveChanges();
        return email; 
    }

    public EmailAddress ChangeEmailAddress(EmailAddress email)
    {
        Person p = personRepository.Find(p => p.Id == personId).First();
        p.ChangeEmail(email);   
        // change state of email object here so it's updated in the next line???
        // if not here,wouldn't the Person entity have to know about the context
        // or use a service?
        uow.SaveChanges();
        return email;    
    }
}

// Person Repository
public class PersonRepository
{
   // generic repository implementation
}

// Person Entity
public class Person
{
    public string Name { get;set; }
    public IEnumerable<EmailAddress> EmailAddresses { get;set; }

    public void AddEmail(EmailAddress email)
    {
        this.EmailAddresses.Add(email);
    }

    public void ChangeEmail(EmailAddress email)
    {
        EmailAddress orig = this.EmailAddresses.First(e => e.Id == email.id);

        // update properties on orig

        // NOW WHAT? [this] knows nothing about the context in order to change state,etc,or do anything to mark the email add updated
    }
}

// Email 
public class EmailAddress
{
    public string Email { get;set; }
    public bool IsPrimary { get;set; }
}

选项二：
让个人服务使用存储库来添加/更新电子邮件地址,并且不对该实体执行行为.在许多关系(例如地址,两个表需要更新以完成工作)的情况下,这种情况要简单得多,但是模型就变成了一大堆的getter和setter.

// Person Service
public class PersonService {
    // constructor injection to get unit of work and person repository...
    // ...methods to add/update a person
    public EmailAddress AddEmailAddress(int personId,EmailAddress email)
    {   
        Person p = personRepository.Find(p => p.Id == personId).First();
        personRepository.AddEmail(personId,email);   
        uow.SaveChanges();
        return email; 
    }

    public EmailAddress ChangeEmailAddress(EmailAddress email)
    {
        personRepository.ChangeEmail(email);   
        uow.SaveChanges();
        return email;    
    }
}

// Person Repository
public class PersonRepository
{
   // generic repository implementation
}

// Person Entity
public class Person
{
    public string Name { get;set; }
    public IEnumerable<EmailAddress> EmailAddresses { get;set; }
}

// Email 
public class EmailAddress
{
    public string Email { get;set; }
    public bool IsPrimary { get;set; }
}

无论如何,有什么想法吗？

谢谢Brian