当我有一个例外,我不知道究竟是什么错误或什么是我应该做的正确删除对象无一例外所以这是我有问题的功能:删除实体框架对象
protected void RemoveAddDrugSurg()
{
Surgery sur;
DrugsList drug;
Surgery surObject;
DrugsList drugObject;
try
{
if (Session["OldSurgs"] != null)
{
var SurgList = Session["OldSurgs"] as List<Surgery>;
if (SurgList.Count > 0)
{
foreach (ListItem li in chlSurg.Items)
{
surObject = null;
Int64 index = Convert.ToInt64(li.Value);
surObject = SurgList.Find(s => s.SurgeryID == index);
if (surObject == null && li.Selected)
{
sur = new Surgery();
sur.VisitID = Convert.ToInt64(Session["VID"]);
sur.SurgeryID = Convert.ToInt32(li.Value);
Diabetes.AddToSurgeries(sur);
}
else if (surObject != null && !li.Selected)
{
Diabetes.CreateObjectSet<Surgery>().Attach(surObject);
Diabetes.ObjectStateManager.ChangeObjectState(surObject, EntityState.Deleted);
}
}
Diabetes.SaveChanges();
}
}
if (Session["OldDrugs"] != null)
{
var DrugList = Session["OldDrugs"] as List<DrugsList>;
if (DrugList.Count > 0)
{
foreach (ListItem li in chlDrugs.Items)
{
drugObject = null;
Int64 index = Convert.ToInt64(li.Value);
drugObject = DrugList.Find(d => d.DrugID == index);
if (drugObject == null && li.Selected)
{
drug = new DrugsList();
drug.VisitID = Convert.ToInt64(Session["VID"]);
drug.DrugID = Convert.ToInt32(li.Value);
Diabetes.AddToDrugsLists(drug);
}
else if (drugObject != null && !li.Selected)
{
Diabetes.CreateObjectSet<DrugsList>().Attach(drugObject);
Diabetes.ObjectStateManager.ChangeObjectState(drugObject, EntityState.Deleted);
}
}
Diabetes.SaveChanges();
}
}
}
catch (Exception ex)
{
throw;
}
}
和出现的例外是:
IEntityChangeTracker的多个实例不能引用实体对象。
在此先感谢。
你检查了你的app.config吗? – test 2012-04-14 08:27:25
什么?我用同样的方式删除其他对象,它运作良好,但现在我不知道该怎么办! – 2012-04-14 08:31:02
并且抛出异常的哪一行?如果它在.Attach()行上,那么你缓存SurObject仍然/已经跟踪 – 2012-04-14 08:32:56