使用DbUpdateConcurrencyException使用Entity Framework 5错误更新记录

我似乎发疯了，没有在MVC 3实体框架项目中获得更新的简单记录。我想念什么？

我可以很好地创建记录，但是似乎无法弄清楚执行更新的逻辑。我尝试了各种方法（附加，不附加），并认为当涉及到外键或其他东西时，我错过了一种模式。

视图返回的对象已完全填充，并且模型有效。填充外键ID字段。

有什么想法请。

POCO是

public class EFormApplication
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int ApplicationId { get; set; }
    [ForeignKey("ApplicationTemplateId")]
    public virtual ApplicationTemplate ApplicationTemplate { get; set; }
    public int ApplicationTemplateId { get; set; }
    [Required(ErrorMessage = "Each application must have a Title")]
    public string Title { get; set; }
    [Required(ErrorMessage = "Each application must have a Description. This is visible to the clients")]
    public string Description { get; set; }
    [ForeignKey("SecurityId")]
    public virtual Security Security { get; set; }
    public int SecurityId { get; set; }
    public bool Published { get; set; }
    [Display(Name = "EIDV Required")]
    public bool EIDVRequired { get; set; }
    [Display(Name = "Investor confirmation required")]
    public bool InvestorConfirmationRequired { get; set; }
    [Display(Name = "Advisor confirmation required")]
    public bool AdvisorConfirmationRequired { get; set; }
    [Display(Name = "Payment required")]
    public bool PaymentRequired { get; set; }
    [Display(Name = "Login Required")]
    public bool UserLoginRequired { get; set; }
    [Display(Name = "ISA Trans allowed")]
    public bool IsaTransfersAllowed { get; set; }
    public DateTime? Deadline { get; set; }
    [Display(Name = "Fully Subscribed")]
    public bool FullySubscribed { get; set; }
    [Display(Name = "Image Url")]
    [RegularExpression(@"^(ht)tp(s?):\/\/[0-9a-zA-Z].+$", ErrorMessage = "You must enter a valid URI including the http:// or https://")]
    public string ImageUrl { get; set; }
    [Display(Name = "Information Url")]
    [RegularExpression(@"^(ht)tp(s?):\/\/[0-9a-zA-Z].+$", ErrorMessage = "You must enter a valid URI including the http:// or https://")]
    public string InformationUrl { get; set; }
    public bool Discontinued { get; set; }
    public DateTime Created { get; set; }
    public string CreatedBy { get; set; }
    public DateTime LastUpdated { get; set; }
    public string LastUpdatedBy { get; set; }

    //navigation
    public virtual ICollection<ApplicationSubmission> ApplicationSubmissions { get; set; }
}

编辑控制器方法是

    [Authorize(Roles = "Admins")]
    public ActionResult Edit(int applicationId)
    {
        EFormApplication eformapplication = _formRepository.GetEFormApplication(applicationId);
        return View(eformapplication);
    }


    [Authorize(Roles = "Admins")]
    [HttpPost]
    public ActionResult Edit(EFormApplication eformapplication)
    {
        if (ModelState.IsValid)
        {
            eformapplication.LastUpdated = DateTime.UtcNow;
            eformapplication.LastUpdatedBy = User.Identity.Name;

            var opstatus = _formRepository.UpdateEFormApplication(eformapplication);

            if (opstatus.Status)
            {
                return RedirectToAction("Design", "eForm");
            }
            else
            {
                return RedirectToAction("OpStatusError", "Error", opstatus);
            }
        }

        return View(eformapplication);
    }

保存记录的位的存储库方法UpdateEFormApplication如下：

    public OperationStatus UpdateEFormApplication(EFormApplication eFormApplication)
    {
        DataContext.Entry(eFormApplication).State = EntityState.Modified;
        DataContext.SaveChanges();

        return Save(eFormApplication);
    }