“/”应用程序中的服务器错误。

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[InvalidOperationException: 已有打开的与此 Command 相关联的 DataReader，必须首先将它关闭。]
   System.Data.SqlClient.SqlInternalConnectionTds.ValidateConnectionForExecute(SqlCommand command) +6548689
   System.Data.SqlClient.SqlCommand.ValidateCommand(String method, Boolean async) +301
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite) +151
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +104
   System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) +288
   System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior) +237
   HX.Database.DataContext.ExecuteSingleThread(String sql, Object[] params) +254
   HX.Web.SiteRouteHandler.GetHttpHandler(RequestContext requestContext) +2611
   System.Web.Routing.UrlRoutingModule.PostResolveRequestCache(HttpContextBase context) +12394787
   System.Web.SyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +80
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +165