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POEntity framework Calling 'Read' when the datareader is closed
 

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  1. POEntity framework Calling 'Read' when the datareader is closed
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    <p>I have had a breakdown on my webhost. Now finally it is up again, and I have yet to know what the technicians fixed. The problem is now I receive the error:</p> <pre><code>Calling 'Read' when the data reader is closed is not a valid operation. Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.InvalidOperationException: Calling 'Read' when the data reader is closed is not a valid operation. Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace: [InvalidOperationException: Calling 'Read' when the data reader is closed is not a valid operation.] System.Data.Common.Internal.Materialization.Shaper`1.StoreRead() +93 System.Data.Common.Internal.Materialization.SimpleEnumerator.MoveNext() +30 System.Linq.Enumerable.Single(IEnumerable`1 source) +119 System.Data.Objects.ELinq.ObjectQueryProvider.&lt;GetElementFunction&gt;b__2(IEnumerable`1 sequence) +5 System.Data.Objects.ELinq.ObjectQueryProvider.ExecuteSingle(IEnumerable`1 query, Expression queryRoot) +25 System.Data.Objects.ELinq.ObjectQueryProvider.System.Linq.IQueryProvider.Execute(Expression expression) +43 System.Linq.Queryable.Count(IQueryable`1 source) +240 BusinessLayer.Car.GetCarCount() in xxx UserControls_SiteInfo.Page_Load(Object sender, EventArgs e) +225 System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14 System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35 System.Web.UI.Control.OnLoad(EventArgs e) +99 System.Web.UI.Control.LoadRecursive() +50 System.Web.UI.Control.LoadRecursive() +141 System.Web.UI.Control.LoadRecursive() +141 System.Web.UI.Control.LoadRecursive() +141 System.Web.UI.Control.LoadRecursive() +141 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +627 </code></pre> <p>I have not changed anything, so could it be some permissions? I can still log onto my database with the same credentials so it is not the login info. Anyone have an idea? </p> <p>UPDATE: I have found out that I get the error when I try to convert the IQuery to a list. I never received the error before, does this give any of you a clue what could be wrong?</p>
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    1. This table or related slice is empty.
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    1. COwhat happens when you do a direct SQL query? (not using linq-to-sql)
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      1. USJohn Weldon
    2. COI have found out that it is an error with either my database or with the network at my webhost, so it has nothing to do with the entity framework itself.
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    3. COChanging `IEnumerable` to `IList` resolved the issue for me I'm returning a complex object from a sproc
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      1. USsafhac
 

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