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11: Deploying Web Services with WCF
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The GetDataUsingDataContract method illustrates a method that uses a custom type, CompositeType, as a parameter and return type Being a custom type, CompositeType has attributes that help define its contract: DataContract and DataMember The DataContract attribute identifies CompositeType as a type that can be included in a WCF service contact Without the DataContract attribute, a type can t be included as part of the service contract The DataMember attribute decorates type members that are part of the contract for this service Without the DataMember attribute, a type member will not be visible as part of the contract
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Creating Your Own Contract
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We won t explicitly construct our data types for DataContracts, as shown in the CompositeType in Listing 11-1 Instead, we ll use a built-in capability of LINQ to SQL that gives LINQ to SQL entities a DataContract To use LINQ to SQL entities, create a new LINQ to SQL item in the same project the WCF service resides in and add the Customer table to the designer Then click the design surface, not the Customer entity, and view properties Set Serialization Mode to Unidirectional, as shown in Figure 11-2 Now, instead of creating a custom type and copying LINQ to SQL entity data into the custom type and returning the custom type, it will be possible to perform a LINQ to SQL query and return the LINQ to SQL entity
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Figure 11-2 Setting the LINQ to SQL Serialization Mode property
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We started customizing the contract when changing the name of IService1 to ICustomerService, but we need to continue by defining the methods that will become part of the CustomerService contract: GetCustomers, GetCustomer, InsertCustomer, UpdateCustomer, and DeleteCustomer In practice, there will be more methods you ll want, just to customize the contract for the special needs of your application, but these methods depict typical scenarios you ll frequently encounter and are representative of any work you ll perform Listing 11-2 shows the modifications to ICustomerService to support customer operations After making the changes in Listing 2, your application won t compile until you implement the ICustomerService interface in the next section Please make the changes, if you re following along, and keep reading until the next section
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Listing 11-2 WCF service contract implementation
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[ServiceContract] public interface ICustomerService { [OperationContract] Customer GetCustomer(int custID); [OperationContract] List<Customer> GetCustomers(); [OperationContract] int InsertCustomer(Customer cust); [OperationContract] void UpdateCustomer(Customer cust); [OperationContract] void DeleteCustomer(int custID); }
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<ServiceContract()> Public Interface ICustomerService <OperationContract()> Function GetCustomer(ByVal custID As Integer) As Customer <OperationContract()> Function GetCustomers() As List(Of Customer)
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11: Deploying Web Services with WCF
<OperationContract()> Function InsertCustomer(ByVal cust As Customer) As Integer <OperationContract()> Sub UpdateCustomer(ByVal cust As Customer) End Interface
You already know how to specify an interface, and the preceding section explained the purpose of ServiceContract and OperationContract attributes Listing 11-2 shows that all you need to do is specify the methods that you want to be included as part of the contract There are times when you ll need to return a custom type from a WCF service For example, if you need to fill in a drop-down list, all you need is a key for the value and a name for the text So, you can create a custom CustomerLookup class, as shown in Listing 11-3, that specifies DataContract and DataMember attributes Listing 11-3 demonstrates how a custom type could be coded if you ever needed to do this
Listing 11-3 A custom type for a WCF service contract
[DataContract] public class CustomerLookup { [DataMember] public int CustomerID { get; set; } [DataMember] public string CustomerName { get; set; } }
<DataContract()> Public Class CustomerLookup <DataMember()> Public Property CustomerID() As Integer <DataMember()> Public Property CustomerName() As String End Class
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Using a custom type for the purpose of lookup controls at the UI level, such as the CustomerLookup class in Listing 11-3, opens the potential to only communicate information that is necessary, rather than an entire object where all of the data isn t being used Considering the potential slowness of network communication, limiting the amount of information transmitted between the Web service and your application can increase the performance of your application Now that you have a contract in place, the next step is writing a class that implements that contract
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