Entity Framewok：このコマンドに関連付けられている開いているDataReaderが既にあります。最初に閉じる必要があります。

私はEntity Framework ORMでAsp.Net Mvcアプリケーションを持っています。Entity Framewok：このコマンドに関連付けられている開いているDataReaderが既にあります。最初に閉じる必要があります。

私はSelectListを生成するクラスを持っています。

There is already an open DataReader associated with this Command which must be closed first.

は私のクラスに従ってください：

public class SpecialtySelectListPopulatorAttribute : ActionFilterAttribute 
{ 
    public ContextDB Context { get; set; } 

    private SelectListItem[] AvailableSpecialties() 
    { 
     // Error is here... 
     // There is already an open DataReader associated with this Command which must be closed first. 
     return Context.Specialties.ToList() 
      .OrderBy(t => t.Title) 
      .Select(t => new SelectListItem 
      { 
       Text = t.Title, 
       Value = t.ID.ToString() 
      }).ToArray(); 
    } 
    public override void OnActionExecuted(ActionExecutedContext filterContext) 
    { 
     var viewResult = filterContext.Result as ViewResult; 

     if (viewResult?.Model is IHaveSpecialtySelectList) 
     { 
      ((IHaveSpecialtySelectList)viewResult.Model).Specialties = 
       AvailableSpecialties(); 
     } 
    } 
} 

public interface IHaveSpecialtySelectList 
{ 
    SelectListItem[] Specialties { get; set; } 
}

そして、私のスタックトレースが、それは次のとおりです。

[InvalidOperationException: There is already an open DataReader associated with this Command which must be closed first.] 
System.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command) +1543253 
System.Data.SqlClient.SqlConnection.ValidateConnectionForExecute(String method, SqlCommand command) +101 
System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async) +268 
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite) +91 
System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +53 
System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) +161 
System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior) +41 
System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior) +12 
System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.<Reader>b__c(DbCommand t, DbCommandInterceptionContext`1 c) +9 
System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch(TTarget target, Func`3 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed) +576 
System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.Reader(DbCommand command, DbCommandInterceptionContext interceptionContext) +356 
System.Data.Entity.Internal.InterceptableDbCommand.ExecuteDbDataReader(CommandBehavior behavior) +166 
System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior) +12 
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) +112 
    System.Data.Entity.Core.Objects.Internal.ObjectQueryExecutionPlan.Execute(ObjectContext context, ObjectParameterCollection parameterValues) +744 
    System.Data.Entity.Core.Objects.<>c__DisplayClass7.<GetResults>b__6() +97 
    System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction(Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess) +288 
    System.Data.Entity.Core.Objects.<>c__DisplayClass7.<GetResults>b__5() +154 
    System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Func`1 operation) +189 
    System.Data.Entity.Core.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption) +279 
    System.Data.Entity.Core.Objects.ObjectQuery`1.<System.Collections.Generic.IEnumerable<T>.GetEnumerator>b__0() +11 
    System.Data.Entity.Internal.LazyEnumerator`1.MoveNext() +45 
    System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +381 
    System.Linq.Enumerable.ToList(IEnumerable`1 source) +58 
    Project.WebUI.Infrastructure.SelectList.SpecialtySelectListPopulatorAttribute.AvailableSpecialties() in D:\Project\Projects\Project.WebUI\Infrastructure\SelectList\SpecialtySelectListPopulatorAttribute.cs:19 
    Project.WebUI.Infrastructure.SelectList.SpecialtySelectListPopulatorAttribute.OnActionExecuted(ActionExecutedContext filterContext) in D:\Project\Projects\Project.WebUI\Infrastructure\SelectList\SpecialtySelectListPopulatorAttribute.cs:39 
    System.Web.Mvc.Async.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() +253 
    System.Web.Mvc.Async.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() +225 
    System.Web.Mvc.Async.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() +225 
    System.Web.Mvc.Async.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() +225 
    System.Web.Mvc.Async.<>c__DisplayClass33.<BeginInvokeActionMethodWithFilters>b__32(IAsyncResult asyncResult) +10 
    System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +10 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +34 
    System.Web.Mvc.Async.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() +26 
    System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +100 
    System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +10 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +27 
    System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +13 
    System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +29 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +36 
    Project.WebUI.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) in D:\Project\Projects\Project.WebUI\Web\Mvc\Controller.cs:22 
    System.Web.Mvc.Controller.<BeginExecute>b__15(IAsyncResult asyncResult, Controller controller) +12 
    System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +22 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +26 
    System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +10 
    System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +21 
    System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +29 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +28 
    System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9 
    System.Web.Mvc.<>c__DisplayClassa.<EndProcessRequest>b__9() +22 
    System.Web.Mvc.<>c__DisplayClass4.<Wrap>b__3() +10 
    System.Web.Mvc.ServerExecuteHttpHandlerWrapper.Wrap(Func`1 func) +27 
    System.Web.Mvc.ServerExecuteHttpHandlerWrapper.Wrap(Action action) +64 
    System.Web.Mvc.ServerExecuteHttpHandlerAsyncWrapper.EndProcessRequest(IAsyncResult result) +71 
    System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride) +1438

より多くの。私は、リストを取得しています、私はエラーを取得し

[HttpException (0x80004005): Error executing child request for handler 'System.Web.Mvc.HttpHandlerUtil+ServerExecuteHttpHandlerAsyncWrapper'.] 
    System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride) +3452905 
    System.Web.HttpServerUtility.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage) +77 
    System.Web.HttpServerUtility.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm) +29 
    System.Web.HttpServerUtilityWrapper.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm) +24 
    System.Web.Mvc.Html.ChildActionExtensions.ActionHelper(HtmlHelper htmlHelper, String actionName, String controllerName, RouteValueDictionary routeValues, TextWriter textWriter) +464 
    System.Web.Mvc.Html.ChildActionExtensions.RenderAction(HtmlHelper htmlHelper, String actionName) +34 
    ASP._Page_Views_Home_SliderShow_cshtml.Execute() in D:\Project\Projects\Projects.WebUI\Views\Home\SliderShow.cshtml:21 
    System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +197 
    System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +105 
    System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +90 
    System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) +235 
    System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) +107 
    System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +291 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) +13 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +56 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +52 
    System.Web.Mvc.Async.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() +173 
    System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +100 
    System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +10 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +27 
    System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +13 
    System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +29 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +36 
    Project.WebUI.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) in D:\Project\Projects\Project.WebUI\Web\Mvc\Controller.cs:22 
    System.Web.Mvc.Controller.<BeginExecute>b__15(IAsyncResult asyncResult, Controller controller) +12 
    System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +22 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +26 
    System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +10 
    System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +21 
    System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +29 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +28 
    System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9 
    System.Web.Mvc.<>c__DisplayClassa.<EndProcessRequest>b__9() +22 
    System.Web.Mvc.<>c__DisplayClass4.<Wrap>b__3() +10 
    System.Web.Mvc.ServerExecuteHttpHandlerWrapper.Wrap(Func`1 func) +53 
    System.Web.Mvc.ServerExecuteHttpHandlerWrapper.Wrap(Action action) +64 
    System.Web.Mvc.ServerExecuteHttpHandlerAsyncWrapper.EndProcessRequest(IAsyncResult result) +71 
    System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride) +1438 

[HttpException (0x80004005): Error executing child request for handler 'System.Web.Mvc.HttpHandlerUtil+ServerExecuteHttpHandlerAsyncWrapper'.] 
    System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride) +3452905 
    System.Web.HttpServerUtility.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage) +77 
    System.Web.HttpServerUtility.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm) +29 
    System.Web.HttpServerUtilityWrapper.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm) +24 
    System.Web.Mvc.Html.ChildActionExtensions.ActionHelper(HtmlHelper htmlHelper, String actionName, String controllerName, RouteValueDictionary routeValues, TextWriter textWriter) +464 
    System.Web.Mvc.Html.ChildActionExtensions.RenderAction(HtmlHelper htmlHelper, String actionName) +34 
    ASP._Page_Views_Home_Index_cshtml.Execute() in D:\Project\Projects\Project.WebUI\Views\Home\Index.cshtml:6 
    System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +197 
    System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +105 
    System.Web.WebPages.StartPage.RunPage() +17 
    System.Web.WebPages.StartPage.ExecutePageHierarchy() +64 
    System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +78 
    System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) +235 
    System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) +107 
    System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +291 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) +13 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +56 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +52 
    System.Web.Mvc.Async.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() +173 
    System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +100 
    System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +10 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +27 
    System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +13 
    System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +29 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +36 
    Project.WebUI.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) in D:\Project\Project\Project.WebUI\Web\Mvc\Controller.cs:22 
    System.Web.Mvc.Controller.<BeginExecute>b__15(IAsyncResult asyncResult, Controller controller) +12 
    System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +22 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +26 
    System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +10 
    System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +21 
    System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +29 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +28 
    System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9 
    System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9744373 
    System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

どうすればよいですか？何が問題ですか？

出典

2017-01-24 Saeid Mirzaei

「SpecialtySelectListPopulatorAttribute.Context」はどのように割り当てられますか？ – haim770

新しいdatareaderをここで開こうとしているときに、別の場所でコンテキストを使用しているようです。あなたはどこで文脈を使っていますか？ – SirBirne

エラー自体は、SQlCommandsとSQDataReaderを使用して既にSQL Serverから何かを読み込んでおり、接続を開くと、abd did notはそれを閉じます。だから私はあなたがこのメソッドが –

AvailableSpecialtiesメソッドを呼び出すたびに、新しいContextを作成してください。キーワードを使用して、使用コンテキストインスタンスlevel.soアクションにActionFilterAttributeのbcoz、複数の時間を作成しているコード・コンテキスト・インスタンスから

//public ContextDB Context { get; set; } 
private SelectListItem[] AvailableSpecialties() 
{ 
    using(var Context = new MyContext()) 
    { 
     return Context.Specialties.ToList() 
      .OrderBy(t => t.Title) 
      .Select(t => new SelectListItem 
      { 
       Text = t.Title, 
       Value = t.ID.ToString() 
      }).ToArray(); 
    } 
}

出典

2017-01-24 08:10:56

私はStructuremapを使用していて、AttributeSetterで設定しています。リクエストごとにContextの単一インスタンスがある –

しかし、属性は別のライフサイクルを持つことができます。チェックは、**複数の**リクエストごとに1つの属性が使用されます。 –

、そのコンテキストは：だからあなたが考慮属性のコンテキストのライフサイクルと同時要求の問題になりますスコープを使用した後にリリースリソースです。

出典

2017-01-24 10:15:20

Entity Framewok：このコマンドに関連付けられている開いているDataReaderが既にあります。最初に閉じる必要があります。

答えて

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