Presented in C# Corner South India Meet on 31st Jan 16

1. Building Rest Services Using
ASP.NET Web API
Brij Bhushan Mishra
http://codewala.net @code_wala https://www.facebook.com/codewala

2. About Me
• Brij Bhushan Mishra
• 5 times Microsoft MVP - ASP.NET/IIS
• Architect/Consultant/ SME
• Avid Blogger/ Author/ Reviewer
• Speaker at top Conferences including GIDS,
TechEd, C# Corner Conference and many more
• Work closely with various organizations as SME, Content developer, Speaker,
Community Tech Reviewer
• http://codewala.net
• @code_wala
• https://www.facebook.com/codewala
http://codewala.net @code_wala https://www.facebook.com/codewala

3. What is REST ?
http://codewala.net @code_wala https://www.facebook.com/codewala

4. Everybody needs REST?
Representational State TransferRepresentational State Transfer
http://codewala.net @code_wala https://www.facebook.com/codewala

5. Why are we talking about Rest?
• To Understand it, let’s talk about WCF and its working
SOAPSOAPSOAP
http://codewala.net @code_wala https://www.facebook.com/codewala

6. What is Rest?
• Rest is an Architectural Style
Kalinga Architecture
MughalArchitecture
http://codewala.net @code_wala https://www.facebook.com/codewala

7. Rest Constraints
• Client Server
• Stateless server
• Cacheable
• Uniform Interface
• Layered System
• Code on Demand
http://codewala.net @code_wala https://www.facebook.com/codewala

8. Client Server
Request
Response
http://codewala.net @code_wala https://www.facebook.com/codewala

9. Stateless Sever
Request
Response
Request
Response
No State
Preserved
http://codewala.net @code_wala https://www.facebook.com/codewala

10. Cacheable
Request
Response
http://codewala.net @code_wala https://www.facebook.com/codewala
Request
Response
C
a
c
h
e

11. Uniform Interface
• Identification of a resource
• Each resource should be identified by an Id (api/books/{id})
• Manipulation of resources through representations
• Same representations should be sent back as are received via API
• Uses the standard HTTP verbs for the operation
http://codewala.net @code_wala https://www.facebook.com/codewala

12. Layered System
Load BalancerProxy Server
http://codewala.net @code_wala https://www.facebook.com/codewala

13. Why REST?
• Uses HTTP. Less Overhead and lightweight
• Content negotiation
• JSON vs XML
• Any Data from Any Where
http://codewala.net @code_wala https://www.facebook.com/codewala

14. What is ASP.NET Web API?
ASP.NET Web API is framework that enables to write REST based
services.
http://codewala.net @code_wala https://www.facebook.com/codewala

15. HTTP Verbs
• GET (Reading the resource)
• POST (Create a resource)
• PUT (Update a resource)
• DELETE (Delete a resource)
• PATCH (Update a resource)
http://codewala.net @code_wala https://www.facebook.com/codewala

16. Key Characteristics – Defining a Resource
• Collection or single
../api/bookstore/books or /api/bookstore/books/{id}
• Noun (not a verb)
• Navigation (for associated items)
• In Web API, Noun is typically a controller
http://codewala.net @code_wala https://www.facebook.com/codewala

17. Earlier versions of ASP.NET
http://codewala.net @code_wala https://www.facebook.com/codewala

18. ASP.NET Core 1.0
http://codewala.net @code_wala https://www.facebook.com/codewala

19. Postman – Tool for Testing Web API
http://codewala.net @code_wala https://www.facebook.com/codewala

20. Lets Build our First ASP.NET Web API
application
http://codewala.net @code_wala https://www.facebook.com/codewala

21. Content Negotiation
http://codewala.net @code_wala https://www.facebook.com/codewala

22. What we covered today
• What is not REST 
• REST Constraints
• What is ASP.NET Web API
• HTTP Verbs
• ASP.NET Core ( MVC = MVC + Web API)
• POSTMAN
• Demo.. Demo..
http://codewala.net @code_wala https://www.facebook.com/codewala

23. Thank You
http://codewala.net @code_wala https://www.facebook.com/codewala
http://codewala.net
@code_wala
https://www.facebook.com/codewala
brij.mishra@outlook.com
http://bit.ly/1OTSgZ8