SQL事务完成异常

Question

I have a strange problem. All documentation states that the SaveChanges() method must be first called before committing the transaction but in my case it is throwing an exception if done this way. By calling Commit before SaveChanges() I can avoid the "Sql transaction is complete exception"

    [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解决了此错误，我在调用Commit之前先添加了db.SaveChanges（）方法