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POHow to handle WCF exceptions (consolidated list with code)
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  1. POHow to handle WCF exceptions (consolidated list with code)
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    copied!<p>I'm attempting to extend <a href="https://stackoverflow.com/questions/573872/what-is-the-best-workaround-for-the-wcf-client-using-block-issue/573925#573925">this answer on SO</a> to make a WCF client retry on transient network failures and handle <a href="https://stackoverflow.com/questions/479618/renewing-a-wcf-client-when-sct-has-expired">other situations that require a retry such as authentication expiration.</a></p> <p><strong>Question:</strong></p> <p>What are the WCF exceptions that need to be handled, and what is the correct way to handle them? </p> <p>Here are a few sample techniques that I'm hoping to see instead of or in addition to <code>proxy.abort()</code>:</p> <ul> <li>Delay X seconds prior to retry</li> <li>Close and recreate a New() WCF client. Dispose the old one.</li> <li>Don't retry and rethrow this error</li> <li>Retry N times, then throw</li> </ul> <p>Since it's unlikely one person knows all the exceptions or ways to resolve them, do share what you know. I'll aggregate the answers and approaches in the code sample below.</p> <pre><code> // USAGE SAMPLE //int newOrderId = 0; // need a value for definite assignment //Service&lt;IOrderService&gt;.Use(orderService=&gt; //{ // newOrderId = orderService.PlaceOrder(request); //} /// &lt;summary&gt; /// A safe WCF Proxy suitable when sessionmode=false /// &lt;/summary&gt; /// &lt;param name="codeBlock"&gt;&lt;/param&gt; public static void Use(UseServiceDelegateVoid&lt;T&gt; codeBlock) { IClientChannel proxy = (IClientChannel)_channelFactory.CreateChannel(); bool success = false; try { codeBlock((T)proxy); proxy.Close(); success = true; } catch (CommunicationObjectAbortedException e) { // Object should be discarded if this is reached. // Debugging discovered the following exception here: // "Connection can not be established because it has been aborted" throw e; } catch (CommunicationObjectFaultedException e) { throw e; } catch (MessageSecurityException e) { throw e; } catch (ChannelTerminatedException) { proxy.Abort(); // Possibly retry? } catch (ServerTooBusyException) { proxy.Abort(); // Possibly retry? } catch (EndpointNotFoundException) { proxy.Abort(); // Possibly retry? } catch (FaultException) { proxy.Abort(); } catch (CommunicationException) { proxy.Abort(); } catch (TimeoutException) { // Sample error found during debug: // The message could not be transferred within the allotted timeout of // 00:01:00. There was no space available in the reliable channel's // transfer window. The time allotted to this operation may have been a // portion of a longer timeout. proxy.Abort(); } catch (ObjectDisposedException ) { //todo: handle this duplex callback exception. Occurs when client disappears. // Source: https://stackoverflow.com/questions/1427926/detecting-client-death-in-wcf-duplex-contracts/1428238#1428238 } finally { if (!success) { proxy.Abort(); } } } </code></pre>
 

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