EF 4.3（代码优先） - 确定当项目被添加到虚拟ICollection的属性(EF 4.3 (C

有任何方法来确定何时实际项目被添加到当正从查询装载它的ICollection的<>虚拟构件？

希望下面的代码将能够证明我的观点！

public class DbAppointment
{
    public DbAppointment()
    {
    }

    public virtual int AppointmentId { get; set; }
    public virtual string Subject { get; set; }
    public virtual string Body { get; set; }
    public virtual DateTime Start { get; set; }
    public virtual DateTime End { get; set; }

   private ICollection<DbExceptionOcurrence> exceptionOcurrences;
   public virtual ICollection<DbExceptionOcurrence> ExceptionOcurrences
   {
        get { return exceptionOcurrences; }
        set
        {
            exceptionOcurrences = value;
        }
    }
}

和

public class DbExceptionOcurrence
{
    public DbExceptionOcurrence()
    {
    }

    public virtual int ExceptionId { get; set; }
    public virtual int AppointmentId { get; set; }
    public virtual DateTime ExceptionDate { get; set; }
    public virtual DbAppointment DbAppointment { get; set; }
}

加载这些代码是

        Database.SetInitializer(new ContextInitializer());
        var db = new Context("EFCodeFirst");

        // when this query executes the DbAppointment ExceptionOcurrenes (ICollection) is set
        // but for some reason I only see this as an empty collection in the virtual setter DbAppointment
        // once the query has completed I can see the ExceptionOcurrences
        var result = db.Appointments.Include(a => a.ExceptionOcurrences).ToList();

在DbAppointment ICollection的ExceptionOcurrences二传手的每个项目我需要执行一些addtional逻辑。我遇到的问题是，我似乎只是这些信息一旦DbAppointment对象已经被创建。

有没有什么办法，以确定该项目已被添加，所以我可以执行我的逻辑。

干杯阿布斯

显然，您所看到的行为意味着实体框架创建和填充类似这样的集合：

// setter called with empty collection
dbAppointment.ExceptionOcurrences = new HashSet<DbExceptionOcurrence>();

// only getter gets called now
dbAppointment.ExceptionOcurrences.Add(dbExceptionOcurrence1);
dbAppointment.ExceptionOcurrences.Add(dbExceptionOcurrence2);
dbAppointment.ExceptionOcurrences.Add(dbExceptionOcurrence3);
//...

我本来希望你可以使用ObjectMaterialized事件（可以用注册DbContext就像这个例子： https://stackoverflow.com/a/4765989/270591 ，EventArgs的含有物化实体）可惜文件说：