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public class ZipCodeInspector : IParameterInspector
{int zipCodeParamIndex;string zipCodeFormat = @"\d{5}-\d{4}";public ZipCodeInspector() : this(0) { }public ZipCodeInspector(int zipCodeParamIndex){this.zipCodeParamIndex = zipCodeParamIndex;}... // AfterCall is emptypublic object BeforeCall(string operationName, object[] inputs){string zipCodeParam = inputs[this.zipCodeParamIndex] as string;if (!Regex.IsMatch(zipCodeParam, this.zipCodeFormat, RegexOptions.None))throw new FaultException("Invalid zip code format. Required format: #####-####");return null;}
}

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public class ConsoleMessageTracer : IDispatchMessageInspector, IClientMessageInspector
{private Message TraceMessage(MessageBuffer buffer){Message msg = buffer.CreateMessage();Console.WriteLine("\n{0}\n", msg);return buffer.CreateMessage();}public object AfterReceiveRequest(ref Message request, IClientChannel channel, InstanceContext instanceContext){request = TraceMessage(request.CreateBufferedCopy(int.MaxValue));return null;}public void BeforeSendReply(ref Message reply, objectcorrelationState){reply = TraceMessage(reply.CreateBufferedCopy(int.MaxValue));}public void AfterReceiveReply(ref Message reply, objectcorrelationState){reply = TraceMessage(reply.CreateBufferedCopy(int.MaxValue));}public object BeforeSendRequest(ref Message request, IClientChannel channel){request = TraceMessage(request.CreateBufferedCopy(int.MaxValue));return null;}
}

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public class ZipCodeCacher : IOperationInvoker
{IOperationInvoker innerOperationInvoker;Dictionary<string, string> zipCodeCache = new Dictionary<string, string>();public ZipCodeCacher(IOperationInvoker innerOperationInvoker){this.innerOperationInvoker = innerOperationInvoker;}public object Invoke(object instance, object[] inputs, out object[] outputs){string zipcode = inputs[0] as string;string value;if (this.zipCodeCache.TryGetValue(zipcode, out value)){outputs = new object[0];return value;}else{value = (string)this.innerOperationInvoker.Invoke(instance, inputs, out outputs);zipCodeCache[zipcode] = value;return value;}}... // remaining methods elided// they simply delegate to innerOperationInvoker
}

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public class ZipCodeValidation : Attribute, IOperationBehavior
{public void ApplyClientBehavior(OperationDescription operationDescription, ClientOperation clientOperation){ZipCodeInspector zipCodeInspector = new ZipCodeInspector();clientOperation.ParameterInspectors.Add(zipCodeInspector);}public void ApplyDispatchBehavior(OperationDescription operationDescription, DispatchOperation dispatchOperation){ZipCodeInspector zipCodeInspector = new ZipCodeInspector();dispatchOperation.ParameterInspectors.Add(zipCodeInspector);}... // remaining methods empty
}public class ZipCodeCaching : Attribute, IOperationBehavior
{public void ApplyDispatchBehavior(OperationDescription operationDescription, DispatchOperation dispatchOperation){dispatchOperation.Invoker = new ZipCodeCacher(dispatchOperation.Invoker);}... // remaining methods empty
}

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public class ConsoleMessageTracing : Attribute, IEndpointBehavior, IServiceBehavior
{void IEndpointBehavior.ApplyClientBehavior(ServiceEndpoint endpoint, ClientRuntime clientRuntime){clientRuntime.MessageInspectors.Add(new ConsoleMessageTracer());}void IEndpointBehavior.ApplyDispatchBehavior(ServiceEndpoint endpoint, EndpointDispatcher endpointDispatcher){endpointDispatcher.DispatchRuntime.MessageInspectors.Add(new ConsoleMessageTracer());}... // remaining methods emptyvoid IServiceBehavior.ApplyDispatchBehavior(ServiceDescription desc, ServiceHostBase host){foreach (ChannelDispatcher cDispatcher in host.ChannelDispatchers)foreach (EndpointDispatcher eDispatcher in cDispatcher.Endpoints)eDispatcher.DispatchRuntime.MessageInspectors.Add(new ConsoleMessageTracer());}... // remaining methods empty
}

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<configuration><system.serviceModel><services><service name="ZipCodeServiceLibrary.ZipCodeService"   behaviorConfiguration="Default"><endpoint binding="basicHttpBinding" contract="ZipCodeServiceLibrary.IZipCodeService"/></service></services><behaviors><serviceBehaviors><behavior name="Default"><serviceMetadata httpGetEnabled="true"/><consoleMessageTracing/></behavior></serviceBehaviors></behaviors><extensions><behaviorExtensions><add name="consoleMessageTracing" type="Extensions.ConsoleMessageTracingElement, Extensions, Version=1.0.0.0,Culture=neutral, PublicKeyToken=null"/></behaviorExtensions></extensions></system.serviceModel>
</configuration>