entity-framework - Entity Framework + POCO

Question

我正在使用 MVVM 模式构建 WPF 应用程序。我们的堆栈如下所示:

SQL Server 2008 -> Entity Framework

我们使用 StructureMap 进行依赖注入(inject)来注入(inject)我们的 DataFactory，它本质上为我们的 POCO 业务对象执行 CRUD。

ViewModel 将 DataFactory 用于 CRUD，而 xaml 是绑定(bind)到 POCO 中的属性的数据。

整个事情都很好，但我发现唯一有点烦人的是数据工厂。我们在选择时将 EF 对象中的每个属性复制到 POCO 中，而在更新/插入时则相反。

有没有办法像 Fluent 对 NHibernate 但使用 Entity Framework 一样自动化这个过程？

这是数据工厂中的示例插入方法:

public void InsertCustomer(ref Manager.Model.Customer businessObject)
{
    var mgr = new Manager.Data.PersonData.PersonContext();

    var person = new Manager.Data.PersonData.Person();
    var customer = new Manager.Data.PersonData.Customer();

    customer.Comments = businessObject.Comments;
    customer.Company = businessObject.Company;
    customer.IsBusiness = businessObject.IsBusiness;
    customer.IsCompleted = businessObject.IsCompleted;
    customer.ModifiedBy = "someone";
    customer.ModifiedOn = DateTime.Now;
    customer.CreatedBy = "someone";
    customer.CreatedOn = DateTime.Now;

    person.Customer.Add(customer);
    person.FirstName = businessObject.FirstName;
    person.LastName = businessObject.LastName;
    person.Birthday = businessObject.Birthday;
    person.CreatedBy = "someone";
    person.CreatedOn = DateTime.Now;
    person.Gender = businessObject.Gender;
    person.MiddleInitial = businessObject.MiddleInitial;
    person.ModifiedBy = "someone";
    person.ModifiedOn = DateTime.Now;
    person.Nickname = businessObject.Nickname;
    person.Picture = "";
    person.Suffix = businessObject.Suffix;
    person.Title = businessObject.Title;

    mgr.AddToPeople(person);
    mgr.SaveChanges();
}

声明一些类会很好，就像 Fluent 那样:

public class CatMap : ClassMap<Cat>  
{  
  public CatMap()  
  {  
    Id(x => x.Id);  
    Map(x => x.Name)  
      .WithLengthOf(16)  
      .Not.Nullable();  
    Map(x => x.Sex);  
    References(x => x.Mate);  
    HasMany(x => x.Kittens);  
  }  
}

最后我的插入方法看起来像这样:

public void InsertCustomer(ref Manager.Model.Customer businessObject)
{
    var mgr = new Manager.Data.PersonData.PersonContext();

    var person = new Manager.Data.PersonData.Person();
    var customer = new Manager.Data.PersonData.Customer();

    Something.Map(person, businessObject);
    Something.Map(customer, businessObject);  

    person.Customer.Add(customer);

    mgr.AddToPeople(newCustomer);
    mgr.SaveChanges();
}

本质上，我将消除将数据从业务对象移动到 Entity Framework 工作对象的代码，这将在映射类中完成一次，并且不必为每个方法重复。

谢谢!

Answer 1

你可以试试 Automapper，对我有用。

http://www.codeplex.com/AutoMapper