WCF-EF5 - Error due to the service endpoint binding not using the HTTP protocol or HTTP request context being aborted by the server

I am using Entity Framework 5 and WCF data service.

I have the following method in the service1.cs

 public IList<Employee> GetEmployee()
            using (ChinookEntities DBEntities = new ChinookEntities()) { 

            IList<Employee> ListOfEmployees = (IList<Employee>)(DBEntities.Employees.ToList());
            return ListOfEmployees.ToList();

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When I debug through WCF test client I am able to get the list of employees in the above IList<> ListOfEmployees, however after the method executes in the WCF Test client it gives the following error:

An error occurred while receiving the HTTP response to http://localhost:8733/Design_Time_Addresses/ChinookWCF/Service1/. This could be due to the service endpoint binding not using the HTTP protocol. This could also be due to an HTTP request context being aborted by the server (possibly due to the service shutting down).

Just for information I have another method GetData and that works fine from WCF test client and able to invoke the method.

public string GetData(int value)
            return string.Format("You entered: {0}", value);

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Am I missing something.

Thanks in advance.
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With only a partial view of service1.cs (and any other dependencies), we can only *guess* as to the problem and it's solution.

In order for WCF to work, you have to specify the following three things (Address, Binding and Contract).  It looks like you have the address (where to connect) and the binding (what to connect with).  Perhaps you are missing the contract for the GetEmployee method.

Perhaps some more clarification as to the make-up of your project is in order.

ExplorerJKAuthor Commented:
Hi Saige,

Thanks Saige for the reply and Sorry for the delay, Operation contract is present, the issue seems to be in serialization as I said when I debug the data is returned in the ListOfEmployees, it give error when it returns the response of collection to the wire, If I create a new POCO class other than the one created by EF and pass that new POCO class with the ListOfEmployee, will  that pass through WCF test client.

Let me know how we can pass collection (IList<T>)  through WCF as in the above scenario, I will try a different approach in meantime.

Well since a generic List is already a serializable object, you will want to start by ensuring that the Employee object is serializable as well.


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