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POWCF using, closing and extensions
 

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    <p>I am stumped. Perhaps someone can shed some light on WCF client behavior I am observing. </p> <p>Using the WCF samples, I've started playing with different approaches to WCF client/server communication. While executing 1M of test requests in parallel, I was using SysInternals TcpView to monitor open ports. Now, there are at least 4 different ways to call the client:</p> <ol> <li>Create the client, do your thing, and let GC collect it</li> <li>Create the client in a using block, than do your thing</li> <li>Create the client channel from factory in a using block, than do your thing</li> <li>Create the client or channel, but use <a href="http://omaralzabir.com/do-not-use-using-in-wcf-client/">WCF Extensions</a> to do your thing</li> </ol> <p>Now, to my knowledge, only options 2-4, explicitly call client.Close(). During their execution I see a lot of ports left in the TIME_WAIT state. I'd expect option 1 to be the worst case scenario, due to reliance on the GC. However, to my surprise, it seems to be the cleanest of them all, meaning, it leaves no lingering ports behind.</p> <p>What am I missing?</p> <p>UPDATE: Source code</p> <pre><code> private static void RunClientWorse(ConcurrentBag&lt;double&gt; cb) { var client = new CalculatorClient(); client.Endpoint.Address = new EndpointAddress("net.tcp://localhost:8000/ServiceModelSamples/service"); RunClientCommon(cb, client); } private static void RunClientBetter(ConcurrentBag&lt;double&gt; cb) { using (var client = new CalculatorClient()) { client.Endpoint.Address = new EndpointAddress("net.tcp://localhost:8000/ServiceModelSamples/service"); RunClientCommon(cb, client); } } private static void RunClientBest(ConcurrentBag&lt;double&gt; cb) { const string Uri = "net.tcp://localhost:8000/ServiceModelSamples/service"; var address = new EndpointAddress(Uri); //var binding = new NetTcpBinding("netTcpBinding_ICalculator"); using (var factory = new ChannelFactory&lt;ICalculator&gt;("netTcpBinding_ICalculator",address)) { ICalculator client = factory.CreateChannel(); ((IContextChannel)client).OperationTimeout = TimeSpan.FromSeconds(60); RunClientCommon(cb, client); } } private static void RunClientBestExt(ConcurrentBag&lt;double&gt; cb) { const string Uri = "net.tcp://localhost:8000/ServiceModelSamples/service"; var address = new EndpointAddress(Uri); //var binding = new NetTcpBinding("netTcpBinding_ICalculator"); new ChannelFactory&lt;ICalculator&gt;("netTcpBinding_ICalculator", address).Using( factory =&gt; { ICalculator client = factory.CreateChannel(); ((IContextChannel)client).OperationTimeout = TimeSpan.FromSeconds(60); RunClientCommon(cb, client); }); } </code></pre>
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    1. COYou're missing some source code... Could we see your unit tests?
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    2. COSee http://stackoverflow.com/questions/573872/what-is-the-best-workaround-for-the-wcf-client-using-block-issue - the using block can cause issues with WCF.
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    3. COThanks for the link, quite interesting read, but it still does not explain why GC leaves no TIME_WAITs behind, but client.Close() does.
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