sql transaction異常

Question

我有一個奇怪的問題。所有文檔指出SaveChanges()方法必須在提交事務之前首先調用，但在我的情況下，如果以這種方式完成，它將拋出異常。 通過調用SaveChanges()前提交我可以避開「SQL事務完成例外」

[HttpPost] 
    public ActionResult ajax_SaveScreentest(string ScreenTestResult = "") 
    { 

     var shops = from m in db_emp.WorkLocations 
        where m.LocationType == "Shop" 
        select m;  

     db.Database.Connection.Open(); 
     using (var dbtran = db.Database.Connection.BeginTransaction()) 
     { 
      try 
      { 
       if (ScreenTestResult != "") 
       { 

        var sc = js.Deserialize<ScreenTest>(ScreenTestResult); 
        AppFieldValidator.Validate(sc); 
        db.Entry(sc).State = System.Data.EntityState.Added; 
        dbtran.Commit(); //needs to commit first before savechanges otherwise The sql    transaction is completed exception will occur 
        db.SaveChanges(); 


        foreach (var obj in shops) 
        { 
         ScreenShop ss = new ScreenShop(); 
         ss.ScreenID = sc.ID; 
         ss.ShopID = obj.WorkLocationID; 
         ss.ScreenStatus = "Outstanding"; 
         ss.ScreenDateSubmitted = null; 
         db.Entry(ss).State = System.Data.EntityState.Added; 
        } 

        db.SaveChanges(); 

        return Json(new { success = true, message = "" }); 
       } 
       return Json(new { success = false, message = "Screen Test is not supplied" }); 
      } 

      catch (Exception e) 
      { 
       dbtran.Rollback(); 
       if (e.Message.IndexOf("Validation failed for one or more entities.") != -1) 
        return Json(new { success = false, message = "One of the entries you made is  ether too long or unacceptable!" }); 
       return Json(new { success = false, message = e.InnerException != null ? e.InnerException.Message : e.Message }); 
      } 
      finally 
      { 
       db.Dispose(); 
      } 
     } 

Answer 1

NVM得到這個錯誤解決我拳頭加db.SaveChanges（）方法調用commit

前