多个DataReader错误,在本地工作但不在已发布的版本上工作

时间:2017-03-10 21:38:32

标签: asp.net-mvc-5 datareader

在本地运行时,这可以正常工作,但在发布和运行之后我得到了#34;已经有一个与此命令关联的打开DataReader,必须先关闭它。"

是否有使用相同集合数据在不同表上生成多个对象的正确方法?

这可能是处理这种情况的错误方法。

我基本上使用来自一个对象表单的信息来创建另一个对象。

Localhost和发布的版本使用相同的连接字符串。我已尝试将MARS设置为真

    [HttpPost]
    [ValidateAntiForgeryToken]
    [ActionFilters.AuditInventory]
    public ActionResult Create([Bind(Include = "CheckoutID,Date,Provider,Injection,Patient,Chart,Location,Lot,Restocked,Authorized,Accountable,Quantity")] CheckOutInjectionViewModel checkOutInjectionViewModel)
    { 
        foreach (var i in db.Inventories)
        {
            if (i.Location_Injection.Bottle == null)
            {
                if (i.Location_Injection.Location.Location == checkOutInjectionViewModel.Location && i.Location_Injection.Injection.Injection == checkOutInjectionViewModel.Injection)
                {
                    i.Quantity -= checkOutInjectionViewModel.Quantity;
                }
            }
        }



        if (ModelState.IsValid)
        {
            db.CheckedOutInjections.Add(checkOutInjectionViewModel);
            db.SaveChanges();
            var injection = new Injections
            {
                Accountable = checkOutInjectionViewModel.Accountable,
                Date = checkOutInjectionViewModel.Date,
                Injection = checkOutInjectionViewModel.Injection,
                Location = checkOutInjectionViewModel.Location,
                MySignature = checkOutInjectionViewModel.MySignature,
                Provider = checkOutInjectionViewModel.Provider,
                Quantity = checkOutInjectionViewModel.Quantity,
            };
            db.InjectionsAggregate.Add(injection);
            db.SaveChanges();
            return RedirectToAction("Index");
        }

        return View(checkOutInjectionViewModel);
    }

堆栈跟踪

[InvalidOperationException: There is already an open DataReader associated with this Command which must be closed first.]
   System.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command) +2076159
   System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async) +328
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean& usedCache, Boolean asyncWrite, Boolean inRetry) +161
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +121
   System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) +202
   System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch(TTarget target, Func`3 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed) +104
   System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.Reader(DbCommand command, DbCommandInterceptionContext interceptionContext) +505
   System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior) +37

[EntityCommandExecutionException: An error occurred while executing the command definition. See the inner exception for details.]
   System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior) +126
   System.Data.Entity.Core.Objects.Internal.ObjectQueryExecutionPlan.Execute(ObjectContext context, ObjectParameterCollection parameterValues) +1047
   System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction(Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess) +469
   System.Data.Entity.Core.Objects.<>c__DisplayClass7.<GetResults>b__5() +205
   System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Func`1 operation) +238
   System.Data.Entity.Core.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption) +349
   System.Data.Entity.Core.Objects.DataClasses.EntityReference`1.Load(MergeOption mergeOption) +188
   System.Data.Entity.Core.Objects.DataClasses.RelatedEnd.DeferredLoad() +449
   System.Data.Entity.Core.Objects.Internal.LazyLoadBehavior.LoadProperty(TItem propertyValue, String relationshipName, String targetRoleName, Boolean mustBeNull, Object wrapperObject) +131
   System.Data.Entity.Core.Objects.Internal.<>c__DisplayClass7`2.<GetInterceptorDelegate>b__2(TProxy proxy, TItem item) +151
   System.Data.Entity.DynamicProxies.Inventory_AAF69D7ACE3EC0D7440AC81F5B4FEF9AA1625FB9547A97AF87B7EEE3DB9F6C07.get_Location_Injection() +39
   Hughston_Injections.Controllers.CheckOutInjectionViewModelsController.Create(CheckOutInjectionViewModel checkOutInjectionViewModel) +123
   lambda_method(Closure , ControllerBase , Object[] ) +139
   System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +209
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +35
   System.Web.Mvc.Async.AsyncControllerActionInvoker.<BeginInvokeSynchronousActionMethod>b__39(IAsyncResult asyncResult, ActionInvocation innerInvokeState) +39
   System.Web.Mvc.Async.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult) +67
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +42
   System.Web.Mvc.Async.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3d() +72
   System.Web.Mvc.Async.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() +386
   System.Web.Mvc.Async.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() +386
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +42
   System.Web.Mvc.Async.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() +30
   System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +186
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +38
   System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +29
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +65
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +53
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +36
   System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +38
   System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +44
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +65
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +38
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +399
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +157

1 个答案:

答案 0 :(得分:0)

这是我提出的解决方案,只有在我发布的服务器上运行时,我才继续收到打开的DataReader错误,一切运行正常。>

将所有内容转换为sql命令之后,最后我要做的就是移动引用db上下文的foreach循环(在控制器中声明),并且必须在我将更改保存到新的上下文实例之后,例如,尝试仍然会导致失败。

    [HttpPost]
    [ValidateAntiForgeryToken]
    [ActionFilters.AuditInventory]
    public ActionResult Create([Bind(Include = "CheckoutID,Date,Provider,Injection,Patient,Chart,Location,Lot,Restocked,Authorized,Accountable,Quantity")] CheckOutInjectionViewModel checkOutInjectionViewModel)
    {
        if (ModelState.IsValid)
        {
            StringBuilder sb = null;
            using (SqlConnection conn = new SqlConnection("CONNECTION_STRING"))
            {
                try
                {
                    sb = new StringBuilder("INSERT INTO Injections VALUES (");
                    sb.Append("'" + (checkOutInjectionViewModel.Date.HasValue ? checkOutInjectionViewModel.Date.Value.ToString("yyyy-MM-dd") : "1999-01-01") + "',");
                    sb.Append("'" + checkOutInjectionViewModel.Provider + "', ");
                    sb.Append("'" + checkOutInjectionViewModel.Quantity.ToString() + "', ");
                    sb.Append("'" + checkOutInjectionViewModel.Accountable + "', ");
                    sb.Append("'" + checkOutInjectionViewModel.Location + "', ");
                    sb.Append("NULL,");
                    sb.Append("'" + checkOutInjectionViewModel.Injection + "');");

                    sb.Append("INSERT INTO CheckOutInjectionViewModels VALUES (");
                    sb.Append("'" + (checkOutInjectionViewModel.Date.HasValue ? checkOutInjectionViewModel.Date.Value.ToString("yyyy-MM-dd") : "1999-01-01") + "',");
                    sb.Append("'" + checkOutInjectionViewModel.Patient + "', ");
                    sb.Append("'" + checkOutInjectionViewModel.Chart + "', ");
                    sb.Append("'" + checkOutInjectionViewModel.Lot + "', ");
                    sb.Append("'FALSE',");
                    sb.Append("NULL,");
                    sb.Append("'FALSE',");
                    sb.Append("'" + checkOutInjectionViewModel.Provider + "', ");
                    sb.Append("'" + checkOutInjectionViewModel.Injection + "', ");
                    sb.Append("'" + checkOutInjectionViewModel.Location + "', ");
                    sb.Append("'" + checkOutInjectionViewModel.Accountable + "', ");
                    sb.Append("'" + checkOutInjectionViewModel.Quantity.ToString() + "', ");
                    sb.Append("NULL);");

                    conn.Open();


                    var context = new ApplicationDbContext();
                    context.Database.ExecuteSqlCommand(sb.ToString());
                    context.SaveChanges();

                    foreach (var i in db.Inventories)
                    {
                        if (i.Location_Injection.Bottle == null)
                        {
                            if (i.Location_Injection.Location.Location == checkOutInjectionViewModel.Location && i.Location_Injection.Injection.Injection == checkOutInjectionViewModel.Injection)
                            {
                                i.Quantity -= checkOutInjectionViewModel.Quantity;
                            }
                        }
                    }

                }
                catch (Exception ex)
                {
                    ViewBag.Error = ex.Message + Environment.NewLine + sb.ToString();
                    ViewBag.Locations = new SelectList(db.Locations, "Location", "Location");
                    ViewBag.Providers = new SelectList(db.Providers, "Provider", "Provider");
                    ViewBag.Injections = new SelectList(db.Injections, "Injection", "Injection");
                    ViewBag.Accountables = new SelectList(db.Accountables, "Accountable", "Accountable");
                }
                finally
                {
                    conn.Close();
                }
                return RedirectToAction("Index");
            }
        }
        return View(checkOutInjectionViewModel);
    }