无法解析符号ObjectStateManager [英] Cannot resolve Symbol ObjectStateManager

问题描述

我已经得到的错误不能解析符号ObjectStateManager 的试图从实体框架4.把它在我的数据库环境时，我找不到其他任何人有这个问题。我已经尝试使用 System.Data这和 System.Data.Objects

是否有需要为使用ObjectStateManager来进行特定的实体框架？还是我缺少某种安装包？我使用的数据库优先实体框架。

下面是code这是给我的错误：（7号线）

  [HttpPost]
        公众的ActionResult EditProfile（用户用户）
        {
            如果（ModelState.IsValid）
            {
                db.Users.Attach（用户）;
                db.ObjectStateManager.ChangeObjectState（用户，EntityState.Modified）;
                db.SaveChanges（）;
            }
            返回RedirectToAction（档案）;
        }
 

解决方案

我相信你找到了解决办法通过，但现在我遇到了同样的问题，只是现在能够通过改变EntityState线以下，以解决这个问题：

  db.Entry（用户）.STATE = EntityState.Modified;
 

I have getting an Error of "Cannot Resolve Symbol ObjectStateManager" when trying to call it on my Database context from Entity Framework 4. I can't find anyone else having this issue. I have tried using System.Data and System.Data.Objects.

Is there a specific Entity Framework that needs to be made in order to use the ObjectStateManager? Or Am I missing some sort of install package? I am using Database First Entity Framework.

Here is the code it is giving my error: (Line 7)

[HttpPost]
        public ActionResult EditProfile(User user)
        {
            if (ModelState.IsValid)
            {
                db.Users.Attach(user);
                db.ObjectStateManager.ChangeObjectState(user, EntityState.Modified);
                db.SaveChanges();
            }
            return RedirectToAction("Profile");
        }

解决方案

I am sure you found a solution by now but I ran into the same issue just now and was able to resolve it by changing the EntityState line to the following:

db.Entry(user).State = EntityState.Modified;

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