Unable to cast object of type ‘System.Data.Entity.Infrastructure.DbQuery`1[ConsoleApplication1.Product]’ to type ‘System.Data.Objects.ObjectQuery’.

Let me post problem this time instead of solution.

Look at the code I have and examples in the Internet. This code should not get an error:

 

    static void Main(string[] args)

    {

      //northwindEntities context = new northwindEntities();

      using (var context = new northwindEntities())

      {

        context.Database.Log = Console.Write;

        var result = (from r in context.Products select r);

        string str = (((System.Data.Objects.ObjectQuery)result).ToTraceString());

      }

 

but I got the following error:

System.InvalidCastException was unhandled

  HResult=-2147467262

  Message=Unable to cast object of type ‘System.Data.Entity.Infrastructure.DbQuery`1[ConsoleApplication1.Product]’ to type ‘System.Data.Objects.ObjectQuery’.

  Source=ConsoleApplication1

  StackTrace:

       at ConsoleApplication1.Program.Main(String[] args) in c:\VCSharpTemp\VS2013\ConsoleApplication1\ConsoleApplication1\Program.cs:line 20

       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)

       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)

       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()

       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)

       at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)

       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)

       at System.Threading.ThreadHelper.ThreadStart()

  InnerException:

 

ObjectQuery is inherited from IQueryable so it should not be a problem.

 

I have created a bug here https://connect.microsoft.com/VisualStudio/feedback/details/813361/unable-to-cast-object-of-type-system-data-entity-infrastructure-dbquery1-consoleapplication1-product-to-type-system-data-objects-objectquery.

 

Any suggestion is welcome.

 

Reference:

https://chanmingman.wordpress.com/2014/01/10/unable-to-cast-object-of-type-system-data-entity-infrastructure-dbquery1consoleapplication1-product-to-type-system-data-objects-objectquery-2/

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About chanmingman

Since March 2011 Microsoft Live Spaces migrated to Wordpress (http://www.pcworld.com/article/206455/Microsoft_Live_Spaces_Moves_to_WordPress_An_FAQ.html) till now, I have is over 1 million viewers. This blog is about more than 50% telling you how to resolve error messages, especial for Microsoft products. The blog also has a lot of guidance teaching you how to get stated certain Microsoft technologies. The blog also uses as a help to keep my memory. The blog is never meant to give people consulting services or silver bullet solutions. It is a contribution to the community. Thanks for your support over the years. Ming Man is Microsoft MVP since year 2006. He is a software development manager for a multinational company. With 25 years of experience in the IT field, he has developed system using Clipper, COBOL, VB5, VB6, VB.NET, Java and C #. He has been using Visual Studio (.NET) since the Beta back in year 2000. He and the team have developed many projects using .NET platform such as SCM, and HR based applications. He is familiar with the N-Tier design of business application and is also an expert with database experience in MS SQL, Oracle and AS 400.
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One Response to Unable to cast object of type ‘System.Data.Entity.Infrastructure.DbQuery`1[ConsoleApplication1.Product]’ to type ‘System.Data.Objects.ObjectQuery’.

  1. Pingback: Unable to cast object of type ‘System.Data.Entity.Infrastructure.DbQuery`1[ConsoleApplication1.Product]‘ to type ‘System.Data.Objects.ObjectQuery’. | Chanmingman's Blog

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