entity-framework - Graphdiff 正在删除实体

Question

我有以下实体：

public class Profile
{
    [Required]
    public string Name { get; set; }

    [Required]
    public string Description { get; set; }

    [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int ID { get; set; }

    public IList<Functionality> Functionalities { get; set; }
}  

和

public class Functionality
{
    [Required]
    public string Name { get; set; }

    [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int ID { get; set; }
}  

在我的服务方法中，当我尝试以下操作时，它会从数据库中删除不在配置文件功能列表中的功能对象：

(...)
var databaseFunctionalities = this
                             .Repository
                             .GetByIds<Functionality>(profile
                                                     .Functionalities
                                                     .ToIdList());
profile.Functionalities.Clear();
profile.Functionalities.AddRange(databaseFunctionalities);

((BaseRepository)this.Repository)
.UpdateGraph(profile,map => map.OwnedCollection(p => p.Functionalities));
this.Repository.SaveChanges();  
(...)  

有什么想法吗？
谢谢！

Answer 1

在阅读了andypelzer在这篇文章中关于Associated和Owned之间差异的解释后找到了解决方案：

https://github.com/refactorthis/GraphDiff/issues/43

所以我改变了

((BaseRepository)this.Repository)
    .UpdateGraph(profile,map => map.OwnedCollection(p => p.Functionalities));
this.Repository.SaveChanges();  

至

((BaseRepository)this.Repository)
    .UpdateGraph(profile,map => map.AssociatedCollection(p => p.Functionalities));
this.Repository.SaveChanges();  

并且像魅力一样工作！