ASP MVC

http://www.asp.net/mvc/tutorials/mvc-4/getting-started-with-aspnet-mvc4/intro-to-aspnet-mvc-4

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Introduction (1) MVC (Model View Controller) uses a

common design (architectural) pattern to build web applications We could have an endless talk about

design patterns Refer to the GOF

It’s not a new concept. MVC was introduced in the 1970

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Introduction (2) The model gets requests from the

controller and sends back data The model knows things

The view gets data from the control and is responsible for rendering The view shows the things the model

knows

The model implements application logic

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Introduction (3) The controller plays the largest role

It sends requests to the model and gets back data

That data is passed on to the appropriate view

It gets and interprets requests from clients

It gets commands from the users and tells the view what to show and the model what to do

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MVC and ASP MVC 4 is the version supplied with VS

2012 MVC 5 is supplied with VS 2013

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MVC and ASP You can use Razor to build the user

interface We can also use ASP forms

It’s a very different beast than ASP.NET Web forms There is no view-state for example

MVC and Web Forms can be used in the same application

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Reasons to use MVC Easy to test Component-based Modules are very plug and play

There is no view state or server forms It’s up to you

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Reasons NOT to use MVC It’s complicated You must live in the MVC structure

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MVC The ModelFrom Wikipedia

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MVC (URLs) You are used to URLs pointing to a

physical resources An HTML document An aspx file Or something….

URLs work much differently in MVC We route names to physical URLs By default, the parts of a URL are special

If this sounds restful – it is.

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MVC Routes (1) Routes provide the mechanism to map

URLs into a corresponding call to a controller function

Roughly speaking, the format of a route is

{controller}/{action}/{id}

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MVC Routes (2)

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MVC Views Views provide the display engine in the

MVC model You create them in two ways

As traditional ASP.NET Web forms Using Razor

In a sentence, Razor is really not much more than mutated PHP

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The MVC Model (2) Model properties and method

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MVC Controllers The controller does the work It reads and writes data from the model

(via properties and methods It sends data to the view

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Create an MVC Application (1)

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Create an MVC Application (2)

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MVC Application (Structure) First, the system calls Application.Start This sets up the “routings”

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Application startup Register routes sets up the default

controller We usually need not mess with it