C# 4 and .NET 4

Clients ❘ 1305
set the value below to false and remove the metadata endpoint above
before deployment — >
Similar to the Add service reference from Visual Studio, the Svcutil utility needs metadata to create the
proxy class. The Svcutil utility can create a proxy from the MEX metadata endpoint, the metadata of
the assembly, or WSDL and XSD documentation:
svcutil http://localhost:8080/RoomReservationwsdl /language:C# /out:proxy.cs
svcutil CourseRegistration.dll
svcutil CourseRegistration.wsdl CourseRegistration.xsd
After the proxy class is generated, it just needs to be instantiated from the client code, the methods need to
be called, and finally the Close() method must be invoked:
var client = new RoomServiceClient();
client.RegisterForCourse(roomReservation);
client.Close();
The generated proxy class derives from the base class ClientBase that wraps the Channel
Factory class. Instead of using a generated proxy class, you can use the ChannelFactory
class directly. The constructor requires the binding and endpoint address; next, you can create the channel and
invoke methods as defined by the service contract. Finally, the factory must be closed:
var binding = new WsHttpBinding();
var address = new EndpointAddress("http://localhost:8080/RoomService");
var factory = new ChannelFactory(binding, address);
IRoomService channel = factory.CreateChannel();
channel.ReserveRoom(roomReservation);
//.
factory.Close();
The ChannelFactory class has several properties and methods, as shown in the
following table.
ChannelfaCTory members
Credentials
Endpoint
State
Open()
Close()
Opening Opened Closing
Closed Faulted
desCriPTion
Credentials is a read-only property to access the ClientCredentials
object that is assigned to the channel for authentication with the service. The
credentials can be set with the endpoint.
Endpoint is a read-only property to access the ServiceEndpoint that is
associated with the channel. The endpoint can be assigned in the constructor.
The State property is of type CommunicationState and returns the current
state of the channel. CommunicationState is an enumeration with the values
Created, Opening, Opened, Closing, Closed, and Faulted.
The Open() method is used to open the channel.
The Close() method closes the channel.
You can assign event handlers to get informed about state changes of the
channel. Events are fired before and after the channel is opened, before and
after the channel is closed, and in case of a fault.
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