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Calling the Service
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WCF supports several ways to create and configure a client to call a service. First, as was the case with hosting a service, the calling code can exist within any type of application web application, Windows application, even another WCF service. Regardless of the client application type you choose, the client requires several bits of information to successfully call the service. The service contract: This can be any local type (class or interface) that adheres to the contract published by the service endpoint. The service address: This should be the same address configured in the service endpoint. The service binding: The client must use the same protocols, transport, and encoding as the service endpoint.
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CHAPTER 9 WINDOWS COMMUNICATION FOUNDATION
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Notice that these three pieces of information match the information exposed by the service endpoint exactly. In fact, the client must use this information to establish a client-side endpoint. Similar to the service endpoint, the client-side endpoint establishes the communication plumbing going up to the service and also manages the message exchange. WCF does not care exactly how all this information gets to the client. You could, for example, manually code the contract type into the client and set the proper address and binding in the configuration file. Here s what this might look like: // In the client code // This must adhere to the service contract, but does NOT need // to be named the same. [ServiceContract] interface INotTheSameNameAsService { [OperationContract] int Add(int n1, int n2); [OperationContract] int Subtract(int n1, int n2); } <!-- In the client s configuration file --> <system.serviceModel> <client> <endpoint bindingSectionName="wsProfileBinding" address="http://localhost:13101/MathService" contractType="INotTheSameNameAsService"> </client> </system.serviceModel> In this example, notice that the client-side contract (INotTheSameNameAsService) is, as its name suggests, not named the same as the service-side contract (IMathService). WCF will validate that the service contract at each endpoint (client and service) is structurally equivalent, but unlike some distributed technologies, such as .NET Remoting, WCF does not require full type fidelity down to the type name and assembly name. This is an important difference between a distributed object approach and a service-oriented approach because the latter leads to easier versioning and, therefore, more resilient systems. That said, you shouldn t radically change the name of the contract for no good reason. Although the technique shown in the previous listing is a valid way to represent the address, binding, and contract, most developers would rather avoid all the manual coding and tedious configuring in favor of a more automated approach. Thankfully, WCF ships with the Service Metadata Utility tool (Svcutil.exe) that can query a service, retrieve its metadata, and create the appropriate client-side address, binding, and contract. It also creates a service proxy that, similar to a Web Service proxy, enables the client code to call the service by calling the proxy s methods.
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The Svcutil.exe tool has many options, but the following example demonstrates a simple, common usage: svcutil.exe http://localhost:13101/MathService /config:app.config In this case, the Svcutil.exe tool generates a configuration file with all the appropriate address and binding settings. It also generates a client-side service contract type and a proxy class, as we show here: [ServiceContract()] public interface IMathService { [OperationContract( ... )] int Add([MessageBody(...)] int n1, [([MessageBody(...)]int n2); [OperationContract( ... )] int Subtract([MessageBody(...)] int n1, [([MessageBody(...)]int n2); } public partial class MathServiceProxy : ProxyBase<IMathService>, IMathService { public MathServiceProxy() {} public MathServiceProxy(string configurationName) : base(configurationName) {} public MathServiceProxy(System.ServiceModel.Binding binding) : base(binding){} public MathServiceProxy(EndpointAddress address, Binding binding) : base(address, binding) {} public int Add(int n1, int n2) { return base.InnerProxy.Add(n1, n2); } public int Subtract(int n1, int n2) { return base.InnerProxy.Subtract(n1, n2); } } Now that the proxy, contract, and configuration are complete, the client code can simply use the proxy to call operations on the service. We demonstrate this here:
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