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
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);
}