Question

我得到了例外：

“ObjectContext实例已被释放，不能再用于需要连接的操作。”

仅当我尝试将对象或该对象的某些属性添加到@Html.ActionLink时。

我已经多次审核了我的代码，并且找不到任何有关可能导致此异常的建议的异常情况？

谢谢！

UserManagerResult.cs

public class UserManagerResult {
    public bool Success{get; set;}
    public string ErrorMessage{get; set;}
    public Account User{get; set;}
    public List <Account> UserList{get;}
    public UserManagerResult() {
        Success = false;
        UserList = new List <Account>();
    }

}

UserManager.cs

    public static UserManagerResult GetUserList() {
        UserManagerResult userManagerResult = new UserManagerResult();
        try {
            using (AlenMotorsDbEntities alenMotorsDbEntities = new AlenMotorsDbEntities()) {
                foreach (Account account in alenMotorsDbEntities.Accounts.ToList()) {
                    userManagerResult.UserList.Add(account);
                }
                return userManagerResult;
            }
        }
        catch (Exception ex) {
            userManagerResult.ErrorMessage = ex.Message;
            return userManagerResult;
        }
    }

DeveloperViewModel.cs

public class DeveloperViewModel {
    [Display(Name = "New Role")]
    public string NewRole{get; set;}
    [Display(Name = "Remove Role")]
    public List <SelectListItem> RoleList{get; set;}
    [Display(Name = "User list")]
    public List <Account> UserList{get; set;}
}

UserManagerController.cs

 public ActionResult Developer(DeveloperViewModel model) {
        UserManagerResult getUserList = UserManager.GetUserList();
        model.UserList = getUserList.UserList.ToList();
        return View(model);
    }

我正在使用的视图

                 @{
                foreach (Account account in Model.UserList.ToList()) {
                    <tr>
                        <th scope="row">--</th>
                        <td>@account.Email</td>
                        <td>@account.LastName</td>
                        <td>@account.FirstName</td>
                        <td>
                            @Html.ActionLink("Remove", "Remove", account)
                        </td>
                    </tr>
                }
            }

Answer 1

在你的GetUserList（）中，试试这个：

 foreach (Account account in alenMotorsDbEntities.Accounts.Include(i=>i.YourOtherEntity).Include(i=>i.AnotherEntity).ToList())

并继续添加所有相关的相关实体。

Entityframework ObjectContext实例已放置在特定位置

1 个答案: