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Chapter 11: Deploying Web Services with WCF 307
<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
C#:
[DataContract]
public class CustomerLookup
{
[DataMember]
public int CustomerID { get; set; }
[DataMember]
public string CustomerName { get; set; }
}
VB:
<DataContract()>
Public Class CustomerLookup
<DataMember()>
Public Property CustomerID() As Integer
<DataMember()>
Public Property CustomerName() As String
End Class