Dot Net : A beginner's tutorial for understanding Windows Communication Foundation (WCF)

Introduction

This article is an introduction to the Windows Communication Foundation (WCF). We will try to see the basic concepts behind WCF and will try to implement a small WCF service. We will also work out some small examples of how a WCF service can be consumed.

Background

Like I said in my earlier article on Web Services, communication between applications is very important. Web services provide an efficient way of facilitating communication between applications. But there are limitations with web services too. The major limitation with web services is that the communication can happen over HTTP only. A second limitation with web services is that it provides singlex communication and there is no way to have half duplex or full duplex communication using web services.

Windows Communication Foundation (WCF) comes to the rescue when we find ourselves not able to achieve what we want to achieve using web services, i.e., other protocols support and even duplex communication. With WCF, we can define our service once and then configure it in such a way that it can be used via HTTP, TCP, IPC, and even Message Queues. We can consume Web Services using server side scripts (ASP.NET), JavaScript Object Notations (JSON), and even REST (Representational State Transfer).

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