Can I enroll an NServiceBus Publish in my own TransactionScope?

Question

I have WCF services hosted as http endpoints in IIS. At some points in the handling of command requests to these services, I want to publish an event on NServiceBus to indicate what command was processed. Is it possible for me to do that within a TransactionScope that I create and manage in my code (so that I can include my database interactions in the same transaction)? I would want to be able to publish from the bus within that scope, such that the publication actually goes through if the scope is completed. When I run the following:

  using (var scope = new TransactionScope()) {
    bus.Publish(new SomethingHappened { Description = String.Format("{0} logged in at {1}", user.Name, DateTime.Now.ToLongTimeString()) }).ConfigureAwait(false).GetAwaiter().GetResult();
  }

I find that the message is received by subscribers, even though I did not call scope.Complete() on the transaction scope. What, if anything, can I change so that the publish is enrolled in the scope?

Answer 1

It turns out that in order for the transaction scope to manage the async call, you need to open it with the special option TransactionScopeAsyncFlowOption.Enabled like so:

using (var scope = new TransactionScope(TransactionScopeAsyncFlowOption.Enabled)) {
  bus.Publish(new SomethingHappened { Description = String.Format("{0} logged in at {1}", user.Name, DateTime.Now.ToLongTimeString()) }).ConfigureAwait(false).GetAwaiter().GetResult();
}

Doing that, you get the behavior I was expecting.