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Part II The Core of ASP.NET MVC
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The view as invoked by the controller is, then, a template that is merged with data to produce HTML for the browser. ASP.NET MVC supplies a default view engine that recognizes a syntax that is largely based on the ASPX markup of Web Forms. This allows you to employ server controls in ASP.NET MVC views even though this certainly is not the ideal approach. The development of the view can be made faster by using HTML helper components static methods that emit HTML based on parameters. Unlike server controls, HTML helpers are simple and don t implement any life cycle. In this chapter, we first examined in detail what it takes to process a view and then focused on development aspects, including using HTML helpers, templated helpers, localization, server controls and, last but not least, testing a view. In the next chapter, we ll complete our look at the core of ASP.NET MVC by tackling the third actor of the base MVC pattern the model.
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It does not matter how slowly you go, so long as you do not stop. Confucius By default, the Microsoft Visual Studio standard project template for ASP.NET MVC applications includes a Models folder. If you look around for some guidance on how to use it and information about its intended role, you quickly reach the conclusion that the Models folder exists to store model classes. Fine, but which model is it Or, more precisely, what s the intended definition of a model I don t much like the Models folder. It s not that I don t want to have it around; more simply, I find Models to be a misnomer for an otherwise useful folder. As I see things, ViewModels would have been a much better name for the folder and this is how I often rename the folder in my own projects. What is the point here The change of a folder name doesn t make an application run faster or make it easier to maintain. However, I ve found out in a bunch of real-world projects that less experienced developers or, regardless of the experience, developers with a not-so-clear understanding of layered systems tend to confuse view-specific, screen-bound models with business-oriented domain models. The folder named Models seems to transmit the message that it is just the place where you need have your application s domain model the model with business entities such as Customer, Order, Invoice, and so forth. I agree with anyone who says that not every application needs a neat separation between the object models used in the presentation and business layers. Nonetheless, two distinct models exist, and coexist, in a typical layered Web solution. You might decide that for your own purposes the two models nearly coincide, but you should always recognize the existence of two distinct models that operate in two distinct layers. In this chapter, I ll first go through the differences between view-models and domain models, and then I ll drill down into how you can effectively design a model for the presentation layer and a model for the business layer. Finally, I ll look into binding posted data into complex and rich data types for the controller to use. In doing so, I ll discuss validation and data member annotations.
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Part II The Core of ASP.NET MVC
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What s the Model, Anyway
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As discussed in 3, The MVC Pattern and Beyond, the ASP.NET MVC framework is clearly inspired by the Model2 pattern, regardless of the MVC signature in the name. The Model2 pattern had been largely inspired by the original MVC pattern, and it was, in fact, the result of adapting the MVC pattern to the Web scenario. In the Model2 pattern, most of the work is taken care of by only two actors: the view and the controller. The model is merely a way to represent the data being worked on in the view. The controller orchestrates all operations: it receives posted data, performs any required action, selects the next view, and orders the selected view to render. Where s the model, then What s its intended meaning As I see things, the model in ASP.NET MVC is simply an abstraction for any data the controller passes down to the view. This definition is perfectly in line with the definition of the model actor that you might read about in the original MVC paper. The paper describes the model as the data being worked on in the view. With that said, let s forget about the Models folder for now and start thinking logically about the various faces of the MVC model you might meet in an ASP.NET MVC application. And, if needed, add new folders to group any new classes and abstractions. Note The default Visual Studio template for ASP.NET MVC 2 features a non-empty
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Models folder that just contains a file named AccountModels.cs. This file relates to the login functionalities of the default template and defines a bunch of helper classes. Unless you find out that the default support for login works for you it may or may not you can remove that file from the folder and even rename or remove the folder itself. In a way, however, the content of the Models folder in the default ASP.NET MVC 2 project brings up the idea that the folder is expected to contain view-specific data models that span over controllers and views.
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