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Representing UI concepts in code Defining the presentation model Representing user input Scaling to complex scenarios
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A model is a representation of something meaningful. It s not necessarily something physical but something real: a business concept or an API that s difficult to work with. When we write object-oriented software, we create classes that make up this representation. We can create our representation so that when we use it we re working in a natural human language, like English or Spanish or business jargon, instead of in programming language constructs like Booleans, meaningless strings, and integers. When working with a user interface (UI) framework like ASP.NET MVC, the UI is the complex problem that we manage. It s the data in a window, a form submission from a user, the options in a select list. Whereas model is an overloaded term in software, this chapter focuses on the presentation model the model that represents the screen and user input of an application.
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Consider a screen that shows a table to the user, as shown in figure 2.1. This table is the product of our software development. It deserves to exist as a firstclass object in our system. This will allow us to intentionally create it and to maintain it after its initial development. A first-class object representing this table, or rather representing each row, will also allow our view code to easily display the table itself. In listing 2.1 we have a simple model class for the table in figure 2.1.
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Listing 2.1 The CustomerSummary class
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public class CustomerSummary { public string Name { get; set; } public bool Active { get; set; } public string ServiceLevel { get; set; } public string OrderCount { get; set;} public string MostRecentOrderDate { get; set; } }
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Each property represents a column
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This model is intentionally simple; it consists mostly of strings. That s what we re representing, after all: text on a page. The logic that displays the data in this object will be straightforward; the view will only output it. The presentation model is designed to minimize decision making in the view.
A table in our user interface
Presentation model
The model for the entire table is of type IEnumerable<CustomerSummary>. With a simple model like that, the view only has to iterate through it, writing a row for each CustomerSummary. In the next section, we ll discuss the programmatic creation of the model.
Delivering the presentation model
Somewhere in our application, we ll build this presentation model. It may be hydrated with the results of a simple database query, like a flat report. Or it may be calculated and projected from another set of interesting data. It s common to have a class whose sole responsibility is to formulate the presentation model. Doing the work of building a presentation model in application code is better than doing that work in the view. The view is convoluted enough as it is, and it s focused on HTML and style. A separate class that creates the presentation model can be easily tested, programmed, and maintained. It s also best not to create the presentation model in the controller. The controller is busy deciding which view to render and coordinating these other efforts. Listing 2.2 offers a simplistic look at how a controller might send the presentation model to the view.
Listing 2.2 A controller action preparing the presentation model
public ViewResult Index() { IEnumerable<CustomerSummary> summaries = _customerSummaries.GetAll(); return View(summaries); }
Transfers presentation model to view
Once the CustomerSummary objects have been created, the controller passes them into the View() method, which transferring the objects to the view B. There s a special mechanism for sharing the model in ASP.NET MVC 2, and we ll cover it next.
ViewData.Model
The controller and view share an object of type ViewDataDictionary named ViewData. ViewData is a regular dictionary, with string keys and object values, but it also features a Model property. Conveniently, ViewData.Model is where we put our model. The Model property is also strongly typed, so our view knows exactly what to expect, and developers can take advantage of IDE features like IntelliSense and support for renaming variables. Listing 2.3 shows how a view can describe its model type in the Page directive.
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