Method signature changes after adding WCF service

Question

In my solution I have a create a WCF service which takes message contract class as parameter.

[ServiceContract]
public interface IServiceClass
{
    [OperationContract]
    Employee AddEmployee(Employee employee);

}

 public class ServiceClass : IServiceClass
 {
    public Employee AddEmployee(Employee employee)
    {
       //do something
    }
 }

[MessageContract]
public class Employee
{
    [MessageHeader]
    public string EmployeeNumber { get; set; }

    [MessageBodyMember]
    public string FirstName { get; set; }
    [MessageBodyMember]
    public string LastName { get; set; }
    [MessageBodyMember]
    public DateTime DOB { get; set; }
}

Then I am adding this service to my client application using Add service reference option. The service added successfully. Then in my client program I used this method. But the method signature has been changed. It changed as follows.

 public void AddEmployee(ref string EmployeeNumber, 
    ref System.DateTime DOB, ref string FirstName, ref string LastName)

I am using the service in the client as follows.

TcpServiceReference.ServiceClassClient service =
            new TcpServiceReference.ServiceClassClient();

NOTE:TcpServiceReference is the service name

I cant understand the reason.

Answer 1

Not exactly sure why WCF does this some times, but if you use the service interface, you'll get the "correct" method signatures:

TcpServiceReference.IServiceClass service = 
    new TcpServiceReference.ServiceClassClient();

(this is assuming that IServiceClass is the client-side name of the service interface that svcutil (Add Service Reference) has generated for you.)