Question

I have created EF Data Services before but I’m receiving this message everytime I try and create a EF5 – WCF Service Application.

The operation ‘ProcessRequestForMessage’ could not be loaded because
it has a parameter or return type of type
System.ServiceModel.Channels.Message or a type that has
MessageContractAttribute and other parameters of different types. When
using System.ServiceModel.Channels.Message or types with
MessageContractAttribute, the method must not use any other types of
parameters.

1. I create the WCF Service Application,
2. add references System.Data.Services
3. Generate the EF Model
4. Changed the Code Generation Strategy to “Default” and deleted the “.tt”
5. Inherit the DataService< DBEntities> to my service class (Service1)
6. Add the required “InitilizeService” routine
7. No changes to web.config

When i try and debug I get the message. I am using VS2012

It was a while ago since i’ve used Data Services but looking at my old VS2010 project that works I have modified web.config to include a service with an endpoint with “System.Data.Services.IRequestHandler” as the contract.

I also tried it again aswell as changing the binding to a “webHttpBinding” That didn’t seem to work either. Any ideas?

If all else fails i guess i can use Open Access ORM with its built in service generation tools because I can atleast get that working.

Best Regards

Chris Leach

Answer 1

Add:
Factory=”System.Data.Services.DataServiceHostFactory, Microsoft.Data.Services, Version=5.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35″