sql transaction异常

Question

我有一个奇怪的问题。所有文档指出SaveChanges()方法必须在提交事务之前首先调用，但在我的情况下，如果以这种方式完成，它将抛出异常。 通过调用SaveChanges()前提交我可以避开“SQL事务完成例外”

[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得到这个错误解决我拳头加db.SaveChanges（）方法调用commit

前