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POIs it necessary to call EndInvoke in the callback from an EventHandler.BeginInvoke (C# .Net 3.5)
 

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    <p>I'm setting up a WCF client and server scenario that needs to be reliable and scalable and as part of that I'm trying to make it multithreaded. Admittedly I don't have extensive multithreading experience.</p> <p>On the client, the callback from the server (in this case "OnMessage") fires a client-side event that should be passed off in the background. I have the client's CallbackBehavior ConcurrencyMode set to Single (at least, for now). So in order to do a reply to the callback, rather than calling the handler as normal (either handler(sender, eventargs, or handler.Invoke...) I'm calling handler.BeginInvoke.</p> <p>Everything works fine, but in the callback I'm wondering if I need to explicitly call EndInvoke or if I can basically do nothing (here's my lack of multithreading experience showing).</p> <pre><code>public void OnMessage(Message message) { EventHandler&lt;MessageEventArgs&gt; handler = OnServerMessage; if (handler != null) handler.BeginInvoke(this, new MessageEventArgs(message), CompleteHandler, handler); } public void CompleteHandler(IAsyncResult result) { ((EventHandler&lt;MessageEventArgs&gt;)result.AsyncState).EndInvoke(result); } </code></pre> <p>Can I replace CompleteHandler with a direct reference to handler.EndInvoke, or an empty method, or perhaps is there something more I should be doing?</p> <p>Also, at the moment, the event subscriber blocks waiting on user input from the console. When the application is complete, it would either block waiting on the database, or be asynchronous bottom-to-top (so this may not be necessary, but I'd still like to know).</p>
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