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class Program { static void Main(string[] args) { using(MathServiceProxy math = new MathServiceProxy("IMathService")) { Console.WriteLine(math.Add(5, 2)); Console.WriteLine(math.Add(3, 3)); } } }
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The concept of a contract is a core foundation to WCF. Address and binding are also important pieces, but they track closer to an administrator s set of responsibilities. Contracts, on the other hand, are firmly rooted in the developer s space. WCF defines three different types of contracts: Service contract: As we mentioned earlier, this defines the service operations and the input and output parameters of each operation. Every service must have one associated service contract and may have more. Data contract: This defines the data structure WCF uses to serialize and deserialize an instance of a complex type. Data contracts must be associated with every complex type exposed by a service operation as parameters or return values. Message contract: This enables you to explicitly define the layout of a message; for example, what goes in the header versus what goes in the body of the message. The following sections provide some more details about each of the contract types.
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WCF provides three attribute types that together allow you to define a service contract: ServiceContract, OperationContract, and BindingRequirements. You ve already seen simple examples of ServiceContract and OperationContract. Understand that each of these provides additional parameters that allow you to further refine the contract. For example, consider this service contract, which shows some ServiceContract and OperationContract settings: [ServiceContract(Namespace="http://indigorocks/", Name="CustomerService")] interface ICustomerService { [OperationContract()] CustomerData GetCustomerByEmail(string email); [OperationContract(IsOneWay=true)] void SaveCustomer(CustomerData cust); }
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In this example, first notice the additional parameters set in the ServiceContract attribute. Namespace and Name together enable you to explicitly specify the namespace and name of the contract. By default, WCF uses the full interface or class name. Also notice the IsOneWay parameter is set in the OperationContract to indicate that the SaveCustomer method is a oneway operation with no return values.
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Data contracts describe the structure of data passed in and out of the service. In the case of simple, known types such as integers and strings, WCF applies a default contract; if your service exposes only simple types, you do not need to define a data contract. The CustomerService contract shown in the previous listing, however, exposes a CustomerData type, which is a complex type and, therefore, requires a data contract. Again, WCF makes it easy to define a data contract by providing several attributes that you can use to decorate the CustomerData type: // Also need a reference to System.Runtime.Serialization.dll using System.Runtime.Serialization; [DataContract] public class CustomerData { [DataMember] public string FirstName; [DataMember] public string LastName; [DataMember] public string Email; } As you can see, the data contract attributes are analogous to the XML serializer attributes such as XmlElement and XmlAttribute. However, unlike today s Web Services, WCF does not by default use the XmlSerializer to serialize complex types. Instead it uses XmlFormatter, which has better support for versioning and understands these new DataContract and DataMember attributes. You can explicitly specify the desired formatter using the FormatMode parameter of the ServiceContract attribute as we show in the following example. [ServiceContract(Namespace="http://indigorocks/", Name="CustomerService", FormatMode = ContractFormatMode.XmlFormatter)] interface ICustomerService { ... }
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Using Message Contracts
Future WCF developers will frequently define service and message contracts, but using message contracts to explicitly define the message structure will likely be less common. This can prove useful if you need to interoperate with another (non-WCF) service, which requires a particular message format. To define a message contract, you use the MessageContract, MessageHeader, and MessageBody attributes as shown here:
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[MessageContract] public class CustomerMessage { [MessageHeader] public int CustomerId; [MessageBody] public CustomerData Customer; } This message contract can now be used as a parameter in a service operation. For example: [ServiceContract()] interface ICustomerService { [OperationContract()] void SaveCustomer(CustomerMessage customerMsg);
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