我有以下情况:为什么这个奇怪的行为与EF6?
我有一个Parent
实体在我EF6数据库第一数据模型
public partial class Parents
{
public Parents()
{
this.Childs = new HashSet<Childs>();
}
public int IdParent { get; set; }
public string Description { get; set; }
public virtual ICollection<Childs> Childs { get; set; }
}
和Child
实体
public partial class Childs
{
public int IdChild { get; set; }
public int IdParent { get; set; }
public string Description { get; set; }
public virtual Parents Parents { get; set; }
}
然后我填充的对象:
Parents parent = new Parents();
parent.Description = "Test parent";
List<Childs> childList = new List<Childs>();
childList.Add(new Childs { Description = "Test child 1" });
childList.Add(new Childs { Description = "Test child 2" });
现在我做这个操作:
using (CUSTOMER_Entities context = new CUSTOMER_Entities())
{
//adding parent and childs to the context (WITHOUT ANY LINK OR FOREING KEY SET)
context.Parents.Add(parent);
context.Childs.AddRange(childList);
context.SaveChanges();
}
我的问题是:为什么的SaveChanges后,我已孩子的保存在数据库与正确的“IdParent”?
通常我做:
using (CUSTOMER_Entities context = new CUSTOMER_Entities())
{
context.Parents.Add(parent);
foreach (var child in childList)
{
parent.Childs.Add(child);
}
context.SaveChanges();
}
或
using (CUSTOMER_Entities context = new CUSTOMER_Entities())
{
context.Parents.Add(parent);
foreach (var child in childList)
{
child.IdParent = parent.IdParent;
context.Childs.Add(child);
}
}
什么是正确的方法是什么?