Hello World Application in MVC 4 VB

There are a lot of resources on the internet about MVC 4 with C#,  but a dearth of those about MVC 4 VB.

 

We could not find even a simple Hello World demonstration using MVC 4 and Visual Studio 2012 VS 2012

 

You can download the source files here

 

This demo is a translation into VB of Roger Harford great video "Introduction to ASP.NET MVC Part 2/3: Creating a Hello World Site"

 

http://www.youtube.com/watch?v=rejv7S8SYjw&list=WL46D062071AA44E03

 

In Step 1 of his video he places the Route in the Global.asax file,  whearas in my version the route is added to the \App_Start\RouteConfig.vb

 

This file has the following code:

 

Imports System

Imports System.Collections.Generic

Imports System.Linq

Imports System.Web

Imports System.Web.Mvc

Imports System.Web.Routing

 

Public Class RouteConfig

    Public Shared Sub RegisterRoutes(ByVal routes As RouteCollection)

        routes.IgnoreRoute("{resource}.axd/{*pathInfo}")

 

        routes.MapRoute( _

            name:="Default", _

            url:="{lang}", _

            defaults:=New With {.controller = "HelloWorld", .action = "Index", .lang = UrlParameter.Optional} _

        )

 

      

    End Sub

End Class

 

 

Model:

 

The model is called HomeModel.vb in the \Models folder with the following code:

 

Public Class HomeModel

 

    Public Property message As String

 

End Class

 

The "Model" is a great place to add Class functions that handle data access, and business logic.  The constructor can load in the data from a database, and then various methods can manipulate it.

 

View:

 

There needs to be a folder called \Views\HelloWorld

 

and in there the file:  Index.vbhtml

 

@modeltype HelloWorld.HomeModel 

@Model.message

 

The "View" is ideally only for presentation.  You can add logic, but this should be restricted to logic that effect the presentation.

 

Controller:

 

In there \controllers folder there needs to be a file called HelloWorldController.vb with the code:

 

Imports HelloWorld.HomeModel

 

Namespace HelloWorld

    Public Class HelloWorldController

        Inherits System.Web.Mvc.Controller

 

 

 

        ' GET: /HelloWorld

 

        Function Index(lang As String) As ActionResult

            Dim model As New HomeModel

 

            If lang = "spanish" Then

                model.message = "Hola, Mundo"

            Else

                model.message = "Hello World!!"

            End If

 

            Return View(model)

        End Function

 

    End Class

End Namespace

 

The "Controller" is a good place to call methods and access properties of classes defined in the "Model", in particular those that effect presentation which is sent down to the "View" HTML pages.

 

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