我想我遇到了一个错误,看起来EF在删除并重新插入实体后没有很好地处理引用。我已经成功与下面的代码重现它(假设所有的断言通过,除了一个我在评论中讨论):
引用保留为空
var database = new TestEntities();
// select and delete the info record
var info = database.Info.First(i => i.ID == 1);
Assert.AreEqual(1, info.MemberID);
// when i uncomment the line below the last Assert fails
// Assert.IsNotNull(info.Member);
database.Info.Remove(info);
// add it again and persist it to the database
database.Info.Add(new Info {
ID = 1,
MemberID = 1
});
database.SaveChanges();
// should not be null ? EDIT: i guess i understand this becoming null
Assert.IsNull(info.Member);
// and even here its still null
info = database.Info.First(i => i.ID == 1);
Assert.IsNull(info.Member);
谁能告诉我什么是怎么回事?
编辑: 我的实体首先使用数据库生成,然后使用DbContext/POCO生成器来生成。
public partial class Member
{
public Member()
{
this.Info = new HashSet<Info>();
}
public int ID { get; set; }
public string Name { get; set; }
public virtual ICollection<Info> Info { get; set; }
}
public partial class Info
{
public int ID { get; set; }
public int MemberID { get; set; }
public virtual Member Member { get; set; }
}
尝试关闭延迟加载。 – cadrell0 2012-01-12 21:32:11
您的实体如何定义?先编码?从数据库生成? – 2012-01-12 21:34:08
@ cadrell0 - 我怕这不是一个选项,因为我需要延迟加载。 – Fabian 2012-01-12 21:52:59