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Brown Bag Lunch Series: 10/06/2010

An Introduction To ASP.NET MVC

by Mayank Srivastavahttp://www.MayankSrivastava.com

Table of Contents

The Framework

Frequently

Bought Together

The Pattern

The Product

So what is MVC pattern?

Image from Wikipedia.org

Model-View-Controller is an architectural pattern that isolates "domain

logic" (the application logic for the user) from the user interface (input

and presentation), permitting independent development, testing and

maintenance of each (separation of concerns).

Basics

ASP.NET Web Forms

+ MVC Pattern

= ASP.NET MVC

ASP.NET

+ MVC Pattern

= ASP.NET MVC

ASP.NET == ASP.NET Web Forms

ASP.NET - The Song Remains The Same

Web Forms

Request (*.aspx) PageHandlerFactory

Responsible for page processing engine

Create a server form

Execute Page life cycle

Load View state / Control state

Server Form / PageResponse

(Browser understandable content)

Inheriting

System.Web.UI.Page

does the trick.

So what is MVC pattern?

Model

• Domain-specific representation of data

• Business logic

• Storage layer is an implementation detail

So what is MVC pattern?

View

• Presents data to the user

• Read-only views as well as forms

• Minimal display-only logic

So what is MVC pattern?

Controller

• Responds to requests

• Connects models to view

• Invokes model code as appropriate

MVC based ASP.NET framework

Request (URL)Controller

Response

(Browser understandable

content)

Model

View

-> Get the model (if needed)

-> Bind the model to the view (if needed)

->Render the view

Vie

ws

kn

ow

ho

w t

o p

res

en

t m

od

els

Other related frameworks - http://en.wikipedia.org/wiki/Model%E2%80%93View%E2%80%93Controller

So what changed…

No Page life cycle

• No Server page, no server controls, only Views!

• Web is state ‘LESS’ environment.

• An asynchronous call should be an asynchronous call.

No View state

• Again, web is state ‘LESS’ environment.

• In hindsight, for the stateless web - state should be Model’s

responsibility, not View’s overhead.

No Postback

• Only Http verbs – Get, Post, Put, Delete.

Over to Visual Studio

A Quick comparison

• http://demos.telerik.com/aspnet-ajax/grid/examples/overview/defaultcs.aspx

• http://demos.telerik.com/aspnet-mvc/grid

Asynchronous when you need

Synchronous when you don’t

Web Forms

MVC

Try reload / paging on Telerik’s WebForm’s Grid and

compare the performance against Telerik’s MVC grid.

Page 14

Some more Super Hero talk

Page 15

Routing

It’s all about Routes, not file path.

Application/Controller/Action/Parameter

Or whatever you want

Search Engine Optimization

http://ProductsOnline.com/Products/Details/Batmobile

http://ProductsOnline.com/Products/Catalogs/List/SmartPhones

http://BlogSite.com/Blogs@1/30/2009

Imagine possibilities –

Windows Workflow Foundation

RSS feeds

Window communication foundation

The Browse / Ajaxify Pretty much anything!

Over to Visual Studio

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Deeper dive

Oh and by the way –

ASP.NET MVC, aka System.Web.Mvc, is Open Source

Check out the code on :- http://aspnet.codeplex.com/wikipage?title=MVC

Page 18

Frequently bought together

Customers Who Bought This Item Also Bought

• n-Tier application architecture (Separation of concern).

• IoC – Inversion of control (Dependency injection).

• TDD – Test Driven Development.

18

Page 19

Separation of Concern

What concern? Why are you concerned? My application works fine!

Remember Models?

Page 20

Separation of concern

Model Nothing but POCO

Domain-specific representation of

data

Domain Models

Business logic Business Layer

Storage layer is an implementation

detail

Data Access Layer

Page 21

Separation of concern

Most Common (rather default) Design Patterns

• Services Based for extendibility

• Repositories for Data Access Layer

Page 22

DI & IoC

Dependency injection

(Image - http://www.microbotic.org)

• Static kernel based container

• Control over scope (singleton, Request)

• Popular frameworks – Unity (Enterprise Library), StructureMap,

Ninject, Castle Windsor, Spring.NET…

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Inversion of Control

Database

Web Client

Services Repositories

ICacheService ICacheRepository

WP7 App

Facebook Canvas

Use HttpCacheService : ICacheService

& SQLCacheRepository : ICacheRepository

Use WPCacheService : ICacheService &

LocalFileCacheRepository : ICacheRepository

Use WPCacheService : ICacheService &

LocalFileCacheRepository : ICacheRepository

How should I handle your cache needs?

Page 24

Test Driven Development

Why is it the big breakthrough?

http://ASP.NET.WebForms.com/ProductList.aspx

Is it testable? – No… (at least not easily)

http://ASP.NET.MVC.com/Product/List

Is it testable? – Yes!

var product = new ProductController();var result = product.List();

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Why MVC

• App Driven Development

• Industry moving towards Usability

• It’s all about user experience

Usability = (Functionality ^ Look) * Feel;

Page 26

Future?

Is this the end of Web Forms?

Now that MVC is here.

No! That’s ridicules!

(as on Channel9.MSDN.com)

Page 27

Future?

Flashback

Is this the end of VB?

Now that C# is here.

No! That’s ridicules!However VB can’t be used on some cool stuff

like Window Phone, the .NET Micro Framework

err…I mean VB is equally good.

Page 28

Resources

Learning Resources:

http://www.asp.net/mvc

http://nerddinner.codeplex.com/

http://blog.wekeroad.com/2010/05/24/mvc-starter-2

Prominent bloggers:

Scott Guthrie - http://weblogs.asp.net/scottgu/

Scott Hanselman - http://www.hanselman.com/blog/

Phil Haak - http://haacked.com/

Rob Conery - http://blog.wekeroad.com/

Jon Galloway - http://weblogs.asp.net/jgalloway/

Stevens Anderson - http://blog.stevensanderson.com/

Brad Wilson - http://bradwilson.typepad.com/

Also:

Me :) - http://AspNetLive.BlogSpot.com/

Page 29

Questions