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POStopping a TcpListener after calling BeginAcceptTcpClient
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  1. POStopping a TcpListener after calling BeginAcceptTcpClient
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    copied!<p>I have this code...</p> <pre><code>internal static void Start() { TcpListener listenerSocket = new TcpListener(IPAddress.Any, 32599); listenerSocket.Start(); listenerSocket.BeginAcceptTcpClient(new AsyncCallback(AcceptClient), null); } </code></pre> <p>Then my call back function looks like this...</p> <pre><code>private static void AcceptClient(IAsyncResult asyncResult) { MessageHandler handler = new MessageHandler(listenerSocket.EndAcceptTcpClient(asyncResult)); ThreadPool.QueueUserWorkItem((object state) =&gt; handler.Process()); listenerSocket.BeginAcceptTcpClient(new AsyncCallback(AcceptClient), null); } </code></pre> <p>Now, I call BeginAcceptTcpClient, then some time later I want to stop the server. To do this I have been calling TcpListener.Stop(), or TcpListener.Server.Close(). Both of these however execute my AcceptClient function. This then throws an exception when I call EndAcceptTcpClient. What is the best practice way around this? I could just put a flag in to stop the execution of AcceptClient once I have called stop, but I wonder if I am missing something.</p> <p><strong>Update 1</strong></p> <p>Currently I have patched it by changing the code to look like this.</p> <pre><code>private static void AcceptClient(IAsyncResult asyncResult) { if (!shutdown) { MessageHandler handler = new MessageHandler(listenerSocket.EndAcceptTcpClient(asyncResult)); ThreadPool.QueueUserWorkItem((object state) =&gt; handler.Process()); listenerSocket.BeginAcceptTcpClient(new AsyncCallback(AcceptClient), null); } } private static bool shutdown = false; internal static void Stop() { shutdown = true; listenerSocket.Stop(); } </code></pre> <p>Update 2</p> <p>I changed it to impliment the answer from Spencer Ruport.</p> <pre><code>private static void AcceptClient(IAsyncResult asyncResult) { if (listenerSocket.Server.IsBound) { MessageHandler handler = new MessageHandler(listenerSocket.EndAcceptTcpClient(asyncResult)); ThreadPool.QueueUserWorkItem((object state) =&gt; handler.Process()); listenerSocket.BeginAcceptTcpClient(new AsyncCallback(AcceptClient), null); } } </code></pre>
 

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