Transcript ASP.NET MVC Blogging Engine

Introduction to ASP.NET MVC
Adnan Masood
Volkan Uzun
www.CodePlex.com/YABE
About Adnan
aka. Shameless Self Promotion
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Sr. Software Engineer / Tech Lead for Green Dot Corp. (Financial Institution)
Design and Develop Connected Systems.
Involved with SoCal Dev community, co-founded San Gabriel Valley .NET
Developers Group. Published author and speaker. Winner of 2008-2009
Developer Community Champion Award.
MS. Computer Science, MCPD (Enterprise Developer), MCT, MCSD.NET
Doctoral Student - Areas of Interest: Machine learning, Bayesian Inference,
Data Mining, Collaborative Filtering, Recommender Systems.
Contact at [email protected]
Read my Blog at www.AdnanMasood.com
REST and WCF 3.5 – Geek Speak Webcast
Doing a session in IASA 2008 in San Francisco on Aspect Oriented
Programming; for details visit http://www.iasaconnections.com
About Me
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Web Developer at California State University, San Bernardino
Developing campus web sites, online courses, databases, securing the
systems, making the sites accessible according 508 Guidelines
Active member of Inland Empire .NET user group
User group freak, attending average 5/6 users groups a month, driving 1000
miles average extra.
MS Computer Science, MCTS SQL Server 2005, MCP ASP.NET 2.0
2007-2008 Most Valuable member of Inland Empire .NET user group
Not so active blog: http://msnetprogrammer.net/blog
Trying to write better code by applying TDD (newbie!), reading other
developers’ code (Scott Hanselman’s idea)
Lifetime learner
Email: [email protected]
Agenda
1. Introduction to MVC
2. Building your first MVC application (demo)
3. Understanding Controllers, Controller Actions,
and Action Results
4. Understanding Models, Views, and Controllers
5. How to do Routing (demo)
6. How to do unit testing (demo)
7. How does YABE work (code walkthrough and
demo)
8. Brief discussion of dependency injection et al
Top 5 MVC Resources
1. ASP.NET MVC Home: www.asp.net/mvc
2. Scott Guthrie’s Weblog
http://www.weblogs.asp.net/Scottgu
3. Scott Hanselman’s Blog
http://www.hanselman.com/blog/
4. Phil Haack
http://haacked.com/Tags/aspnetmvc/default.aspx
5. ASP.NET Quick Start
http://quickstarts.asp.net/3-5-extensions/mvc/default.aspx
ASP.NET MVC in a nutshell
• ASP.NET MVC enables you to build Model View
Controller (MVC) applications by using the
ASP.NET framework. ASP.NET MVC is an
alternative, not a replacement, for ASP.NET Web
Forms.
Benefits
• Clear separation of concerns
• Testability - support for Test-Driven Development
• Fine-grained control over HTML and JavaScript
• Intuitive URLs
Highlights & Latest Developments in the
MVC world
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MVC Beta has been released
JQuery is coming with MVC Beta
More TDD support
Some functions are carried over between dll’s
MVC vs. “Classic” ASP.NET
Model View Controller Pattern
Why MVC?
• Very Clean separation of Concerns
• Inherent Unit Testing Support
• Model that leads you down a maintainable
path (helps writing better code but doesn’t
stop you writing crappy code)
• Clean URLs and HTML
MVC Features
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Routing
Controller
View
Dependency Injection
Pluggable
Interfaces for all core contracts
DEMO
• Build your first ASP.NET MVC APP
MVC Components
• Model: Your data source; database, text file, web
services etc
• View: HTML page, what client sees
• Controller: CPU of the mechanism, gets request
from web server, communicates with Model to
get data, returns a view to the requestor.
A URL request is a function inside the
controller class
URLs in MVC
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URL no longer points to the view/aspx page
A URL maps to a controller class
Allows more flexibility to map Urls
URL routing engine, Route table
Routes are tokenized strings
Can use RegEx
Controllers & Actions
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Responds to requests
Interacts with Model, and renders Views
All controllers should have suffix “Controller”
Derives from System.Web.MVC.Controller
class 
• At the end, it is just a class, that has functions
 Controller Actions that can’t be static,
returns ActionResult
ActionResult & Actions
Controller Actions return ActionResult
ActionResult can be:
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ViewResult: Represents HTML and markup.
EmptyResult : Represents no result.
RedirectResult: Represents a redirection to a new URL.
RedirectToRouteResult: Represents a redirection to a new
controller action.
• JsonResult: Represents a JavaScript Object Notation result
that can be used in an AJAX application.
• ContentResult: Represents a text result.
• Custom ActionResult
Model, View, Controller
• Controller gets the request from the requestor,
(route mapping happens here), fires the action
depending on the request
• ActionMethod communicates with Model to get the
data, returns ActionResult
• ActionMethod can use ViewData, ViewData.Model
or TempData to send data to View
• View generates the markup language for the
requestor.
• View can use strongly typed Model
Views/1
• Similar to existing page
• No postback or view state
• Not all page events will fire
• Editing forms requires more work
• Separate pages for viewing, editing, and updating
• Ajax will use UserControls as update panels but
request still goes through the control
Views/2
• Views probably shouldn’t directly access data
sources or services.
• You shouldn’t put the business logic inside the
views; try to stay away from <%if …
• Use the ViewData which stores the model the
view is rendering
• ViewPage<T>, ViewPage
• No postback
DEMO
• Add a new controller Test, with model
interaction
How much backward compatibility is there?
• The MVC framework supports using the existing ASP.NET .ASPX,
.ASCX, and .Master markup files as "view templates" (meaning you
can easily use existing ASP.NET features like nested master pages,
<%= %> snippets, declarative server controls, templates, databinding, localization, etc). It does not, however, use the existing
post-back model for interactions back to the server. Instead, you'll
route all end-user interactions to a Controller class instead - which
helps ensure clean separation of concerns and testability (it also
means no viewstate or page lifecycle with MVC based views).
• The ASP.NET MVC framework fully supports existing ASP.NET
features like forms/windows authentication, URL authorization,
membership/roles, output and data caching, session/profile state
management, health monitoring, configuration system, the
provider architecture, etc.
URL Routing
• URL Routing is mapping the incoming requests to
controller’s action methods.
• There are handler’s settings in web.config
• Routing table exists in Global.asax.cs
• Application_Start() registers the routing table
• You can use regex to define route mappings
• Route mapping works top to bottom, first match
is called
• Download Phil Hack’s RouteDebug tool
Route Examples
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<Controller>/<Action>/<Param>
http://domain/Home/CustomerDetail/45
Html.Link for creating outbound urls
Html.Link(<Friendly Name>, <Action>,
<Controller>)
DEMO
• Add a new controller action , set the route
Unit Testing
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Mock Objects to simulate responses.
Don’t have to go through a page or view
Red/Green Testing
Create instance of controller
Uses Mock Objects
You will need depedency injection down the
road
YABE DEMO
• YABE  YET ANOTHER BLOG ENGINE
• Uses MVC Preview 5
Check it out: http://www.codeplex.com/yabe
Future of ASP.NET MVC
• MVC for the Enterprise
• Classic ASP.NET for quicker implementations
References
• Download latest MVC Beta from Codeplex
• Quick Start Guides
http://quickstarts.asp.net/3-5-extensions/mvc/default.aspx
Questions?
• ASP.NET MVC is a new paradigm for .NET Developers; a new way
to think about programming web application.
• Any Questions / Comments … feel free to contact
[email protected]
[email protected]
• Visit www.CodePlex.com/YABE