basics of wcf

8/9/2019 Basics of WCF

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WCFWindows Communication Foundation

-Abhishek Tyagi

1Boot Camp- Abhishek Tyagi


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So what is a service?

Service is a piece of code, we interact with a

message.

They are passive in itself. They wait for clientto initiate them by sending them a message.

Services expose one or more end points

where message can be sent.

An end point is the access point to the

functionality of the service.



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Why WCF?

WCF unifies the capabilities in ASMX, WSE,

Remoting, COM+, and MSMQ.

Therefore the developers has to learn only one

programming model to build very effective and

industry standard services.

Write service once and expose it many end points.

A lot more options like reliable sessions, lot moresecurity options built in.



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ABC of WCF

An end point to a service

consists of three basic

information:

Address: Address of the endpoint. Where the end point can

be found.

Binding: How a client can

communicate with the service.

Contract: What operations are

available.



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Contracts in WCF

There are four types of contracts in WCF:

Service Contract: Describe which operations the client can

perform on the service.

Data Contract: Define which data types are passed to and

from the service.

Fault Contract: Define which errors are raised by the service,

and how the service handles and propagates errors to its

clients. Message Contract: Allow the service to interact directly with

messages.



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Creating a WCF Service

To create a WCF web service. We need the following:

An Interface containing service contracts.[IHello]

A class implementing this interface.[HelloService]

An SVC file containing assembly name and the

service name.[Hello.svc]

And a configuration file to configure this service so

that it can communicate with client. [web.config ]



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Testing a basic locally hosted WCF Service

Right click on SVC file, select view in browser. The

path in the address bar is where is service is hosted.

Copy this path.

Open the VSs command prompt type the following:

testwcfclient

In test window the methods in service will appear,

click on invoke and test them.



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Consume a WCF Service

Host the WCF service either on IIS or locally.

Add Service reference in the client project. In

service URL give the path where service ishosted.

Create an object of this reference and use the

methods the usual way.



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DEM

O

A demo project is added with this

presentation.



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References

Codeproject.com

Msdn.com

Dotnetslackers.com

Stackoverflow.com

SAMSMicrosoft WCF

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