asp.net qr code generator Goals of ASP.NET MVC and Motivation for Its Development in VB.NET

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Goals of ASP.NET MVC and Motivation for Its Development
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IList<Customer> CustomerList void AddCustomer(int id, string company) SUPERVISING CONTROLLER PASSIVE VIEW string CustomerID string CompanyName string ContactName string Country
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CustomerID: Contact Name: Country:
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int SelectedCustomer
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FIGuRE 1-6 Abstracting a view to an interface
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You implement the interface in the code-behind class of the page. Each member of the interface is implemented in terms of the actual controls in the user interface. Here s an example:
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public partial class _Default : Page, IDefaultView { private DefaultViewPresenter presenter; protected void Page_Load(object sender, EventArgs e) { presenter = new DefaultViewPresenter(this); if (!IsPostBack) presenter.InitializeView(); } #region IDefaultView public string CustomerID { get { return custID.Text; } set { custID.Text = value; } } public string CustomerName { get { return custName.Text; } set { custName.Text = value; } } ... #endregion
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Part I The Programming Paradigm
protected void Button1_Click(object sender, EventArgs e) { presenter.ExpandCustomer(); } ... }
As you can see, the CustomerName property is a wrapper around the Text property of the server control (that is, a TextBox) that renders the customer name in the user interface. The typical presenter also features one method for each action the user can take from within the displayed user interface. If, say, the user can click a button, the presenter is expected to have a corresponding method to handle the event. No data is passed to the method; the presenter retrieves any necessary data from the view interface. Implementing the MVP pattern is not free of charge and might not be worth the effort in just any ASP.NET page. However, especially in the context of enterprise applications, it can help you deal with the surrounding complexity and make the whole solution much more testable and easy to maintain. We ll return to the topic of viable ASP.NET design patterns in 3.
The Web Client Software Factory Experience
An MVP implementation requires sweat and blood to write if you do so entirely on your own, and that s why a few developers do it. At some point, the Patterns & Practices group at Microsoft released a helper framework for building Web clients that relied on the MVP pattern for the generation of the user interface. This framework is the Web Client Software Factory (WCSF). WCSF is a software factory made of a collection of reusable components and libraries to apply proven practices and patterns to ASP.NET development. WCSF comes with a bunch of Visual Studio templates, automated tests, and wizards with the clear purpose of speeding up development. For more information, see http://msdn.microsoft.com/en-us/ library/cc304793.aspx. The software factory is built on top of the Windows Workflow Foundation and the Enterprise Library. As mentioned, WCSF supports MVP and comes with Visual Studio templates and extensions (shown in Figure 1-7) that help you to get an MVP implementation without needing to write all the code (view interfaces and presenters) yourself.
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Goals of ASP.NET MVC and Motivation for Its Development
FIGuRE 1-7 The Visual Studio extensions from WCSF
Why should you consider using WCSF in your upcoming projects Because WCSF is built on the MVP pattern, it gives you neat separation of concerns between the view and presenter. At the same time, it isn t a radical paradigm shift from the Web Forms model and the Page Controller pattern. In other words, you need to get acquainted with the new API of WCSF, but you ll be able to reuse all of your existing ASP.NET and control skills. Internally, the WCSF framework uses inversion of controls extensively, which gives you a nice way to do unit testing and mock objects in the ASP.NET runtime environment. That said, WCSF is not for just any applications. WCSF is not a productivity tool tout-court. More precisely, it is a productivity tool for complex (mostly enterprise-class) applications. All in all, WCSF hasn t captured the heart of too many developers; this is mostly because it s rather complex to learn and use, and it carries the full weight of the Enterprise Library with it, which in itself is complex and requires dedication to learn and use. Because WCSF is designed for enterprise-scale applications, it cannot be seen as a general way of adding testability and SoC to the ASP.NET Web Forms model for all applications.
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