如何解決這個修改控制器？

每一件事情發展順利，我所有讓我得到與價值的新模式進行修改，但東西，在最後步驟出錯，我的模型驗證狀態爲真值這是我的職務控制器如何解決這個修改控制器？

[HttpPost]  
    public ActionResult Edit(Problem problem, HttpPostedFileBase fileUpload) 
    { 
     Problem Edproblem = db.Problems.Find(problem.Id); 
     ViewBag.ATMId = new SelectList(db.ATMs, "Id", "AtmNumber", Edproblem.ATM.AtmNumber); 
     ViewBag.UserId = WebSecurity.GetUserId(User.Identity.Name); 
     ViewBag.ProblemTypeId = new SelectList(db.ProblemTypes, "Id", "Name", Edproblem.ProblemTypeId); 
     var bankId = from e in db.ATMs where e.Id == problem.ATMId select e; 
     ViewBag.BankId = new SelectList(db.Banks, "Id", "Name", bankId); 
     ViewBag.AreaId = new SelectList(db.Areas, "Id", "Name", db.Areas.Where(p => p.Id == Edproblem.ATM.AreaId)); 
     ViewBag.GovId = new SelectList(db.Governates, "Id", "Name", Edproblem.ATM.Area.GovernateId); 

     Problem beforeEdit = db.Problems.AsNoTracking().First(p => p.Id == problem.Id); 

     if (ModelState.IsValid) 
     { 
      DateTime now = DateTime.Now; 

      if (!Directory.Exists(Server.MapPath("~/UploadImages/" + now.ToString("yyyy_MM/")))) 
      { 
       Directory.CreateDirectory(Server.MapPath("~/UploadImages/" + now.ToString("yyyy_MM/"))); 
      } 
      if (!Directory.Exists(Server.MapPath("~/UploadImages/" + now.ToString("yyyy_MM/") + Edproblem.ATMId.ToString()))) 
      { 
       Directory.CreateDirectory(Server.MapPath("~/UploadImages/" + now.ToString("yyyy_MM/") + Edproblem.ATMId.ToString())); 
      } 
      if (!Directory.Exists(Server.MapPath("~/UploadImages/" + now.ToString("yyyy_MM/") + Edproblem.ATMId.ToString() + now.ToString("/dd/")))) 
      { 
       Directory.CreateDirectory(Server.MapPath("~/UploadImages/" + now.ToString("yyyy_MM/") + Edproblem.ATMId.ToString() + now.ToString("/dd/"))); 
      } 

      var image = WebImage.GetImageFromRequest(); 

      if (fileUpload != null) 
      { 
       string fileName = fileUpload.FileName.ToString(); 
       fileName = Guid.NewGuid().ToString() + fileName.Substring(fileName.LastIndexOf(".")); 
       fileName = now.ToString("yyyy_MM/") + problem.ATMId.ToString() + "/" + now.ToString("dd/") + fileName; 
       if (fileUpload != null && fileUpload.ContentLength > 0) 
        fileUpload.SaveAs(Server.MapPath("~/UploadImages/" + image)); 

       image.Save(Server.MapPath("/UploadImages/" + fileName));     

       problem.ImagePath = fileName; 
      } 
      else 
      {      
       if (problem.ImagePath == null) 
       { 
        var getPath = (from e in db.Problems 
            where e.Id == problem.Id 
            select e.ImagePath).ToList(); 
        problem.ImagePath = getPath[0].ToString(); 
       } 
      } 
      problem.UserId = WebSecurity.GetUserId(User.Identity.Name);     
      db.Entry(problem).State = EntityState.Modified;     
      db.SaveChanges(); 
      return RedirectToAction("Index"); 
     } 
     return View(problem); 
    }

這是錯誤，因爲它恰好出現：

An object with the same key already exists in the ObjectStateManager. The ObjectStateManager cannot track multiple objects with the same key.

來源

2014-01-09 Sonic

如果您不打算使用它，爲什麼要將一個Problem對象加載到變量beforeEdit中？ – scheien

我正在嘗試從存儲的數據中獲取舊值但錯誤消息中沒有任何更改您可以說沒用的步驟 – Sonic

難道您不能用新數據填充beforeEdit，然後保存那個嗎？加載它沒有AsNoTracking（），然後填充UserId，圖像路徑等。 – scheien

你加載一個問題對象爲可變beforeEdit，並沒有進一步的利用它。

如果嘗試使用參數中的新數據更新beforeEdit，並保存該數據而不是從視圖返回的對象。

來源

2014-01-09 13:01:30 scheien

如何解決這個修改控制器？

回答

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