Programming WCF Services, 3rd Edition

Addresses

In WCF, every service is associated with a unique address. The address provides two important elements: the location of the service and the transport protocol, or transport scheme, used to communicate with the service. The location portion of the address indicates the name of the target machine, site, or network; a communication port, pipe, or queue; and an optional specific path, or URI (Universal Resource Identifier). A URI can be any unique string, such as the service name or a globally unique identifier (GUID).

WCF supports the following transport schemes:

• HTTP/HTTPS

• TCP

• IPC

• Peer network

• MSMQ

• Service bus

Addresses always have the following format:

[base address]/[optional URI]

The base address is always in this format:

[transport]://[machine or domain][:optional port]

Here are a few sample addresses:

http://localhost:8001
http://localhost:8001/MyService
net.tcp://localhost:8002/MyService
net.pipe://localhost/MyPipe
net.msmq://localhost/private/MyQueue
net.msmq://localhost/MyQueue

The way to read an address such as:

http://localhost:8001

is like this: “Using HTTP, go to the machine called localhost, where on port 8001 someone is waiting for my calls.”

If there is also a URI, as in:

 http://localhost:8001/MyService

the address will read as follows: “Using HTTP, go to the machine called localhost, where on port 8001 someone called MyService is waiting for my calls.”

TCP Addresses

TCP addresses use net.tcp for transport and typically include a port number, as in:

net.tcp://localhost:8002/MyService ...