title: Azure Service Fabric : How to find out if an Actor already exists
body: <p>How can I find out if an Actor with a certain ActorId exists?</p>
  
  <p>The ActorProxy is only for creating an Actor. If a non-existing Id is provided, and the Actor does not exist, a new Actor is created. </p>
  
  <p>The standard ActorService can retrieve all Actors, but thats about it as far as I can see.</p>