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1. ASP.NET MVC 3 Rapid Application Development
Mădălin tefîrcă and Victor Chircu
Abstract. This paper’s aim is to point out the RAD ( Rapid application devel-
opment) elements present in the Microsoft’s MVC 3 and WCF 4.0 using Micro-
soft Visual Studio 2010. It will describe why creating a new web application us-
ing MVC 3 and WCF 4.0 is a easy and fast and also present simple ways to de-
velop such applications.
1 Introduction
The paper will describe to you the simplicity of developing a web application using
Microsoft’s ASP.NET MVC 3 and WCF 4.0. Starting with the creation of a new
project, adding new items, and quickly adding functionality including modeling, data-
bases CRUD operations, UI elements, exposing and consuming REST services etc.
There will be a brief presentation of the Html Helpers provided by Visual Studio, and
the use of Dynamic Templates and how they can help you and a comparison between
MVC 3 and Web Forms, the main web oriented frameworks provided by Microsoft.
2 Creating a new project
Creating a new project is easier than ever. You can create an emtpy project allowing
you to structure it the way you think is best fit, or you can choose to create a new
Internet Application that will create for you a fully functioning project and fully ex-
tensible. It is recommended to choose the second option, because this way you will
not have to worry about the project structure and start developing since the very first
minute. If you watch Fig.1 you can notice that Visual Studio has buit for you separate
folders for Controllers, Views, Models, Scripts, Content.
If you check the packages.config file you can also see that Visula Studio also added
some useful packages for you like jQuery, jQuery-UI, jQuery.Validation meaning
javascript libraries that will greatly improve your development and are very common
to an experienced developer. The Entity Framework nuGet package is installed also
by default and it comes in handy when working with complex databases since most of
the work is done by this ORM (Object Relational Mapping tool ).
In the ViewsShared folder you will find two .cshtml files, _Layout, used as a master
page in the application, and Error, used as an global error page displayed to the user
when the server crashes. These two are also added by default when creating a new
MVC3 project.
2. If you run the application you will notice that you have a fully functional project in-
cluding a minimal authentication system that allows you to register users and authen-
ticate them later on.
Fig. 1.
3 Adding new items
3.1 Models
Visual Studio also has provided for you an easy way for adding new items to your
projects. You can add a new class in the Models folder that will be our new model.
Right click the Models folder and select Add/Class. Name the class Employee and
click Add. Inside the class you type “prop” and click the Tab key. This will instantly
create for you a default property. Pressing the Tab key will switch you through the
property type and property name in order to change them. Make for a start two prop-
3. erties of type string and name them Name and CompanyName and an Id. Still inside
the class, if you type in “ctor” and press Tab key it will automatically generate a con-
structor for you. Inside the constructor assign the CompanyName property a string.
Now you have your first model. Your code should look like this:
public class Employee
{
public Employee()
{
this.CompanyName = "Fictional Company";
}
public int Id { get; set; }
public string Name { get; set; }
public string CompanyName { get; set; }
}
3.2 Context
Now we will have to add a context for Entity Framework database. Int he Models
folder add a new class. This should inherit the DBContext object from Sys-
tem.Data.Entity. Add a property to the class that should look like this:
public class EmployeeContext : DbContext
{
public DbSet<Employee> Employees { get; set; }
}
And now you have your context.
3.3 Controllers
To add a new controller, you simply right click the Controllers folder and select
Add/Controller. You type in the controller name, and then you get to choose between
several scaffolding options like and empty controller, controller with empty actions or
controller with read/write actions and views. The latter is the easiest way to develop.
Choosing this option will require you to set the model class and the data context. Our
model is Employee and context is EmployeeeContext. After selecting those previously
mentioned click Add. This will generate you the whole mechanism required for
CRUD (Create, Read, Update, Delete) operations over the Employee entity, including
database operations, and UI. If you take a look in the Views/Employees folder you
will see that Visual Studio has already generated all the html you need for the actions.
If you run the application in your browser and go to host/Employees you will have the
full functionality done.
4. 4 Html helpers
Html Helpers are provided by visual studio as support for rendering HTML controls
in a view. It has a wide variety of choices like generating a link, forms, or even inputs
or validations for inputs based on a predefined model. Also these helpers are highly
extensible, customizing them being a great benefit for development.
@Html.EditorFor(m => m.Property)
@Html.DropDownListFor(m => m.Property, customSelectList)
5 Dynamic templates
Templates are used to display a predetermined portion of the page layout which also
contains fill-in-the-blanks that can be filled at run time. Template saves a lot of time
because it can be reused in many places. Razor view engine includes a feature called
Inline Template, which allows you to define a portion of dynamic HTML that can be
reused. Also using Razor template you can pass template as a parameter to a method.
You can make this for display or edit mode. All you must do is to set the @model of
the template to the desired type. This can be a struct, a class, or even a collection.
You can call this templates either by setting the name of the templates exactly the
same as the type of the property of the model, or by setting an attribute to the property
[UIHint(“templateName”)].
6 WCF and REST
Consuming and exposing REST services has become easier with the release of Win-
dows Communication Foundation (WCF) 4.0, because of the inclusion of the Web
HTTP programming model.
For exposing RESTful services, all you need is the WCF Rest Service Template 40,
which you can get through the Extension Manager (you can find it in the Tools
menu). In a project created with the template mentioned earlier, you can add a new
class for your service and decorate it with the [ServiceContract] attribute. Now you
can add methods to your service class and decorate them with either the [WebGet]
attribute (for GET requests) or with the [WebInvoke] attribute (for other HTTP me-
thods). Both attributes take a UriTemplate as a parameter, in which you can specify
the URI template to your resource. As a note, every token (string between “{}”) in the
UriTemplate has to be a parameter to the method, as shown in the following example:
5. [WebGet(UriTemplate = "Result?q={keyword}&lat={latitude}&
lng={longitude}&rad={radius}&output={outputType}")]
public string Get(string keyword, double latitude, double
longitude, int radius, string outputType)
After you have defined your RESTfull method, the only think that remains is to regis-
ter it in the Global.asax file, in the RegisterRoutes method:
RouteTable.Routes.Add(new ServiceRoute("WhereToGoService"
, new WebServiceHostFactory(), typeof(WhereToGoService)))
Now by accesing :
<serv-
er>:<port>/WhereToGoService/Result?q=Tuxy&lat=24.4&lng=24.4&rad=10&outp
ut=json, the corresponding Get method from WhereToGoService will be called.
Consuming RESTful services is easy if you use the right tools and .NET classes:
• UriTemplate to specify the template for the URI, and using the UriTem-
plate.BindByPosition or UriTemplate.BindByName methods to replace the
tokens in the template with the actual values.
• WebClient to get the data from the specified URI (for example you can use
the WebClient.DownloadString method which returns the String received by
accessing the URI specified as the method’s parameter).
• LINQ to XML for converting the string into and XML, and manipulating the
XML through LINQ sintax.
• Newtonsoft’s Json.net library for manipulating strings in Json format (for ex-
ample if the service that you are consuming returns information in Json for-
mat), and for converting XML to Json and vice-versa.
These are simple use cases used as proof of concept, but you can develop far more
complex REST services using WCF 4.0, together with other frameworks and libraries
provided by the .NET community.
7 Alternatives
The main advantages of the ASP.NET MVC 3 are that it enables full control over the
rendered HTML, it provides clean separation of concerns, easy integration with java-
script, RESTful urls that enables SEO, no ViewState and PostBacks events. The web
forms provide a wide variety of RAD elements, like drag & drop, automatic event
generation, and it is easier for developers coming from the winform development to
adapt. Another big plus for the web forms framework is the maturity - it has been
around since 2002 and there is a big amount of information regarding solving prob-
lems. Both of them are good choices, neither of the web frameworks are to be re-
placed by the other, nor there are plans to have them merged.
6. There are other vendors that offer 3rd party components and controls, like Telerik or
DevExpress. These controls get rid of most of the boilerplate code that you would be
writing, so they are feasible for small applications. But when it comes to building
complex enterprise applications, you would notice that these 3rd party components do
not cover all of the uses cases that you need, so ASP.MVC would be a safer bet.
8 Conclusion
All mentioned above prove that MVC 3 is very reliable and can easily be used to
develop complex web applications in a very short time, with great elegance. It is easy
to start with at a beginner level, allowing you to build basic functionality without too
much experience, and allowing more advanced developers to build solid, complex
applications in a short time. When working on a project you have to take into consid-
eration its purpose, scale, scalability and maintainability, and choose a framework
accordingly. Even if lately Microsoft has integrated more and more RAD components
into ASP.MVC, this framework is still designed for complex web application.