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310 Microsoft Visual Studio 2010: A Beginner’s Guide
The methods of the CustomerService class in Listing 11-4 show skeleton implementations
of the ICustomerService interface. As you know, Listing 11-2 provided new methods to
the ICustomerService interface, so the code in Listing 11-4 will not compile because it
doesn’t implement the ICustomerService methods. To fix this problem, delete the GetData
and GetDataUsingDataContract methods from the CustomerService class. Then select the
ICustomerService identifier in the CustomerService.cs file, which will display an underline
on the left of the ICustomerService identifier. Hover over that underline to open a menu with
an option to implement the ICustomerService interface, which will generate skeleton code
for each member of the ICustomerService interface inside of the CustomerService class. The
default method implementations throw a NotImplementedException exception, meaning
that you need to write the code to implement those methods based on the ICustomerService
interface. Listing 11-5 shows the implementation of the ICustomerService interface in
the CustomerService class. If using C#, add the code to each method. If using VB, which
doesn’t have the same interface refactoring support as C#, add all methods and code to the
CustomerService class as specified in Listing 11-5.
Listing 11-5 A WCF service implementation
C#:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.Serialization;
using System.ServiceModel;
using System.Text;
namespace WcfDemoCS
{
public class CustomerService : ICustomerService
{
public Customer GetCustomer(int custID)
{
var ctx = new MyShopDataContext();
var customer =
(from cust in ctx.Customers
where cust.CustomerID == custID
select cust)
.SingleOrDefault();