Error after upgrading to Wcf Data Service 5.0

I recently upgraded a WCF Data Service project to WCF Data Services 5.0  for OData v3. This upgrade has support for accessing your EF Code First entities via a Wcf data service.

There’s a good blog post on MSDN by Glenn Gailey with details on how to upgrade.

However, I started my upgraded service and got this rather unhelpful error message:

The server encountered an error processing the request. Please see the service help page for constructing valid requests to the service. The exception message is ‘On data context type ‘<type>’, there is a top IQueryable property ‘<propertyName>’ whose element type is not an entity type. Make sure that the IQueryable property is of entity type or specify the IgnoreProperties attribute on the data context type to ignore this property.’. See server logs for more details.

The cause of the problem was failing to remove all references to  System.Data.Services and System.Data.Services.Client from all my projects.

Following the guidance I’d removed all references to System.Data.Services.* from the main WCF data service project; but I had missed the indirect reference in my “Entity Model” Project.  Some entities  were marked with the [DataContractKey()] attribute; thus leading to the stray reference.

Removing all reference to System.Data.Service.* and replacing with Microsoft.Data.Services.Client.dll fixed the error.

(assemblies can be found in %programfiles(x86)%\Microsoft WCF Data Services\5.0\bin)

48 Replies to “Error after upgrading to Wcf Data Service 5.0”

  1. Aargh!!! I got the same thing after upgrading to WCF 5.0 … with one exception: Error does not occur when I run my service locally, but I get the exact one you get when I deploy it on the production server. Makes no sense at all. Have any ideas?

  2. Hi John, The issue I had was caused because of a mismatch with a previous version of System.Data.Services.* in my application. Have you checked that the production application is resolving the Microsoft.Data.Services.Client correctly. Its is only a guess …but If the assemblies are not being found in your application or bin directory …is .net looking in the GAC on the production server and finding the previous version of System.Data.Services.*?

  3. What that's what I'm thinking. I've placed all assemblies in the /bin folder. I've gone as far as adding this code to the web.config: <assemblies> <remove assembly="System.Data.Services"/> <remove assembly="System.Data.Services.Client"/> <add assembly="System.Spatial, Version=, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> <add assembly="Microsoft.Data.Services, Version=, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> <add assembly="Microsoft.Data.Services.Client, Version=, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> <add assembly="Microsoft.Data.OData, Version=, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> <add assembly="Microsoft.Data.Edm, Version=, Culture=neutral, PublicKeyToken=31BF3856AD364E35"/> </assemblies> Not sure if there's a definitive way of making sure that it's using the proper assemblies vs. the ones in the GAC. Still get the same error 🙁

  4. One thing I don't understand. You said that "The issue I had was caused because of a mismatch with a previous version of System.Data.Services.*". If that were the case, wouldn't the compiler kicked it out? I thought that .NET would have done a version check and would have kicked out a " assembly version not found, etc. etc." Strange thing for me is that in my code, even though I eliminated System.Data.Services.* in my references, I still had to Import System.Data.Services and System.Data.Services.Common in my SVC file. When, instead I do Import Microsoft.Data.*, it tells me that no namespaces exist. Did you get that as well?

  5. The assembly name has changed; but the namespaces is identical. The namespace is still System.Data.Services regardless of which assembly you reference You're correct, If both assemblies (System.Data.Services.* and Microsoft.Data.Services.*) are added to the same project then they will conflict. In my case I had multiple related projects – A Model Project and a DB Provider Project. I correctly upgraded the DB Provider project with the new assembly; but left a stray reference in my Model project to the old assembly ….The solution compiled without complaint – but at runtime I got that nasty general error message. And updating my Model project to the latest assemblies fixed the issue. However your issues may be caused by something different – my solution did not work locally

  6. It ended up being some conflict between the June 2011 CTP and WCF 5.0. I have no idea as I went ahead and upgraded everything to .NET 4.5, and EF 5.0. and everything worked fine after that.

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