Windows Communication Foundation
(WCF) - Part 1
Jaliya UdagedaraMCPD
http://www.jaliyaudagedara.blogspot.com/
What are we going to discuss today?• Software Development Evolution
• Web Services
• Web Service Architecture
• Invoke a Web Service
• XML
• SOAP
• WSDL
• UDDI
• Demo
Software Development Evolution
Object Oriented
Component Based
Service Oriented
1980s
1990s
2000s
• OOP Concepts
• Components• Interfaces• Substitutable• Serialization
• Web Services• HTTP Requests• XML Messages
Web Services
• What is a Web Service?
A software component designed to support interoperable machine-to-machine interaction over a network.
Web Services contd.
• Runs on a Web server.• HTTP over RPC.• SOAP (Simple Object Access Protocol) or
REST (REpresentational State Transfer).• Exposes functions.• Listens for HTTP requests and executes Web
methods.• Software as a service without concern for
the type of consumer.
Web Service Architecture
Discovery
Description
Invocation
Transport
Discover & Locate
WSDL
SOAP
HTTP
Invoke a Web Service
Client Service
WSDL
SOAP Response
SOAP Request
• Provides an endpoint description using WSDL. Processes XML messages framed using SOAP.
• Describes its messages using XML Schema.• Communicates via open protocols (HTTP
etc).• Can be discovered using UDDI.
XML
• eXtensible Markup Language.
• XML : much like HTML.
• For describing data.
• XML tags are not predefined. We define our
own tags.
• Prefect for Web Services.
XML contd. : XML vs. HTML
<html><body>
<h1>Hello HTML</h1>
<p>Paragraph</p></body>
</html>
XML contd. : XML vs. HTML
<?xml version=1.0?><myxml>
<mytitle>Hello XML</mytitle>
<mypara>Paragraph</mypara>
</myxml></xml>
XML contd. : XML vs. HTML
• HTML
• What Information?
• Hard for machine. Relatively easy for
human.
• XML
• Not displaying.
• Readable to both human and machines.
SOAP (Simple Object Access Protocol)
• SOAP is a format for sending messages.
• SOAP is platform independent.
• SOAP is language independent.
• Different applications running on different
operating systems.
• SOAP is based on XML.
SOAP (Simple Object Access Protocol)
• SOAP is a format for sending messages.
• SOAP is platform independent.
• SOAP is language independent.
• Different applications running on different
on operating systems.
• SOAP is based on XML.
WSDL (Web Service Definition Language)
• Describes the functions & location of the
service.
• Again XML Based.
UDDI (Universal Description Discovery and Integration)
• Directory of web service interfaces.
• Uses WSDL to describe interfaces.
• Communicates via SOAP.
DEMO
Thank You!
