Calling multiple WCF services return error - Disposed Object can't be used

Question

Hi,

My WCF service provides multiple services from different end points. Currently my client app calls these methods independently as shown below:

object result1 = null;
object result2 = null;

using (OperationContextScope contextScope = new OperationContextScope((IContextChannel)ServiceInstance))
{
   MyService.AddHeaders();
   result1 =  ServiceInstance.Method1()
}

//some other processing depending on the value of result1

using (OperationContextScope contextScope = new OperationContextScope((IContextChannel)ServiceInstance))
{
   MyService.AddHeaders();
   result2 =  ServiceInstance.Method2()
}

Now, to improve performance, I tried doing the following:

using (OperationContextScope contextScope = new OperationContextScope((IContextChannel)ServiceInstance))
{
   MyService.AddHeaders();
   result1 =  ServiceInstance.Method1()
   result2 =  ServiceInstance.Method2()
}

//some other processing depending on the value of result1 && result2

But this is failing with the error: "disposed object can't be used" and in the inner exception the disposed object is ChannelService.

Can someone help me how can I combine multiple WCF service calls under one OperationContextScope?

Thanks Aravind

Answer 1

I am not certain but this may be because your service might be single call (and/or does not support sessions). You may want to tweak with service behaviors to get this working.

Answer 2

Babai,

If the intention is only to make more than 1 call within the single OperationContextScope, you may use Innerchannel of the service.

using (OperationContextScope contextScope = new OperationContextScope((IContextChannel)abc.InnerChannel))

---

using (OperationContextScope contextScope = new OperationContextScope((IContextChannel)abc.InnerChannel)) {

            /* Add Headers */
                    MessageHeader header
            = MessageHeader.CreateHeader(
            "Service-Bound-CustomHeader",
            "http://Microsoft.WCF.Documentation",
            "Custom Happy Value."
            );

                    header = MessageHeader.CreateHeader(
                "Service-Bound-OneWayHeader",
                "http://Microsoft.WCF.Documentation",
                "Different Happy Value."
              );

            OperationContext.Current.OutgoingMessageHeaders.Add(header);




            Console.WriteLine(abc.GetData(100));
            Console.WriteLine(abc.GetDataUsingDataContract(new ServiceReference1.CompositeType()).ToString());
        }

---