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    <p>Best practice is to implement IErrorHandler. This is because:</p> <ol> <li><strong>Your code isn’t the only potential source of exceptions.</strong> The methods you call (or a bug) might result in a .NET Exception. If you don’t handle that exception somewhere and aren’t using <a href="http://msdn.microsoft.com/en-us/library/system.servicemodel.servicebehaviorattribute.includeexceptiondetailinfaults.aspx" rel="nofollow">IncludeExceptionDetailInFaults</a> (which you shouldn't in production) this will look like a service crash. </li> <li><strong>Separation of Concerns</strong>: Any business layer called by the service code should not reference WCF (<code>System.ServiceModel</code>) and therefore should be throwing standard .NET exceptions. Keeping the business layer unaware of how its hosted makes it more portable and more testable.</li> <li>[<code>FaultContract</code>] types need to be specified on the [<code>OperationContract</code>]. In larger applications you want the Fault generation to be centralized… In other words know that a particular IErrorHandler returns a particular set of Faults so that you can validate the Contracts Faults types are right. Throwing a Fault type that the contract’s method does not explicitly support is a nasty runtime error.</li> </ol> <p>You could copy and paste a try/catch block in all your service methods to throw a FaultException, but it’s a horrible code smell and is the exact functionality that IErrorHandler is giving you as a behavior. So use IErrorHandler instead.</p> <p>Combining the two models is possible. For example have IErrorHandler process FaultExceptions as needed, but this is not a common practice. </p>
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    1. POHandling WCF exceptions/faults along with FaultException AND IErrorHandler
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    1. USErnieL
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    1. COI fully understand the power and necessity of IErrorHandler in a WCF service. And wrapping every single method into a try-catch is not was I was heading to. But I need a way to tell the client when he's doing something wrong, preferably by using enumerations as fault-code. The client requests 3 apples, but there are only 2 left, then a OperationFault would be raised along with "NotEnoughApples" in detail. But when I implement IErrorHandler, this fault is being caughted as plain Exception, - what seems silly to me. Or do I understand something wrong here?
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    2. CO"The client requests 3 apples, but there are only 2 left" - This doesn't sound like an exceptional circumstance. Perhaps the result of the method should return a meaningful result, but not an exception/fault
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      1. USMark Powell
 

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