TransactionFlowAttribute attribute set to Mandatory but the channel's binding is not configured with a TransactionFlowBindingElement - wcf

Question

I have a big problem. I am trying to create a web service that will work with a distributed transaction.
All the code below is on the server side of the web service(the web service that is called from a client).
I wrote this in my interface:
[ServiceContract]
public interface IClientOperations
{
[OperationContract]
[ServiceKnownType(typeof(TriggerExecInput))]
[ServiceKnownType(typeof(TriggerExecOutput))]
[TransactionFlow(TransactionFlowOption.Mandatory)]
TriggerExecOutput TriggeredProfileDataUpdate(TriggerExecInput triggerInputData, bool isST3StatusActive);
And this in the web.config file:
<services>
<service name="ClientOperationsService" behaviorConfiguration="ServiceBehavior">
<endpoint address="" binding="wsHttpBinding"
bindingConfiguration="wsHttpBinding_Common" contract="SL.STAdmin.Applications.WebAPI.IClientOperations"/>
<endpoint contract="IMetadataExchange" binding="mexHttpBinding" address="mex"/>
</service>
</services>
<bindings>
<wsHttpBinding>
<binding name="wsHttpBinding_Common" transactionFlow="true">
</binding>
</wsHttpBinding>
</bindings>
<behaviors>
<serviceBehaviors>
<behavior name="ServiceBehavior">
<!-- To avoid disclosing metadata information, set the value below to false and remove the metadata endpoint above before deployment -->
<serviceMetadata httpGetEnabled="true"/>
<!-- To receive exception details in faults for debugging purposes, set the value below to true. Set to false before deployment to avoid disclosing exception information -->
<serviceDebug includeExceptionDetailInFaults="false"/>
</behavior>
</serviceBehaviors>
</behaviors>
If I right click the .svc file and click on "View in browser" I get the following error
Exception Details: System.InvalidOperationException: At least one operation on the 'ClientOperations' contract is configured with the TransactionFlowAttribute attribute set to Mandatory but the channel's binding 'BasicHttpBinding' is not configured with a TransactionFlowBindingElement. The TransactionFlowAttribute attribute set to Mandatory cannot be used without a TransactionFlowBindingElement.
I have other .svc files that don't use transactions.
They all work well.
I don't understand why it still tries to use the BasicHttpTransaction when I instruct it to use the other binding type.
DOes anyone have any idea what I am doing wrong?
Thank you in advance.

Answer 1

Add this inside your <system.serviceModel> element of your web.config:
<protocolMapping>
<add scheme="http" binding="wsHttpBinding" bindingConfiguration="wsHttpBinding_Common"/>
</protocolMapping>

Answer 2

You need to do a few things to get the transaction working.
Add the transactionflow to your operation
[OperationContract]
[TransactionFlow(TransactionFlowOption.Mandatory)]
void TransactionSupported(int id, string name);
After that you add an operationbehavior to your implementation
[OperationBehavior(TransactionScopeRequired = true)]
public void TransactionSupported(int id, string name)
{
...
}
In your config file you need to add the transaction flow to your host binding
<system.serviceModel>
...
<bindings>
<netNamedPipeBinding> --> Your binding (don't use basicHttpBinding)
<binding transactionFlow="true"/>
</netNamedPipeBinding>
</bindings>
</system.serviceModel>
And last but not least you need to set the transactionflow of your client to get it working. In my example I do this in my code in my unit test, I think you can also do this in your configuration of your client, in your config file.
var factory = new ChannelFactory<IService>(callback,
new NetNamedPipeBinding() { TransactionFlow = true },
new EndpointAddress("net.pipe://localhost/ping"));