Part I The Programming Paradigm in Visual Basic .NET

Creating QR Code in Visual Basic .NET Part I The Programming Paradigm

Part I The Programming Paradigm
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ASP.NET MVC is a completely new framework for building ASP.NET applications, designed from the ground up with SoC and testability in mind. With ASP.NET MVC, you rediscover the good, old taste of the Web stateless behavior, full control over every single bit of HTML, and total script and CSS freedom. Processing the request and generating the HTML for the browser are distinct steps and involve distinct components. Each of these components controllers and views has its own interface and can be replaced if necessary. In ASP.NET MVC, there s no dependency on ASPX physical server files. ASPX files can still be part of your project, but they now serve as plain HTML templates, along with their code-behind classes. The default view engine is based on the Web Forms rendering engine, but you can use other pluggable engines such as NVelocity or XSLT. (I ll cover controllers and the view engine in full detail in 4, Inside Controllers, and 5, Inside Views. ) The runtime environment is largely the same as in ASP.NET Web Forms, but the request cycle is simpler and more direct. An essential part of the Web Forms model, the page life cycle, is now just an optional implementation detail in ASP.NET MVC. Figure 1-10 compares the run-time stack for Web Forms and ASP.NET MVC.
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Page class Page life cycle (preliminaries) Postback event Page life cycle (finalization) Updating Controls
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FIGuRE 1-10 The run-time stack of ASP.NET MVC and Web Forms
1
Goals of ASP.NET MVC and Motivation for Its Development
As you can see, the run-time stack of ASP.NET MVC is simpler and the difference is because of the lack of a page life cycle. However, this makes it problematic to maintain the state of visual elements across page requests. As mentioned, ASP.NET MVC is closer to the metal, and this has its own side effects. If you need to maintain state, how to do that is up to you. For example, you can store it in Session or Cache or you can even create, guess what, your own tailor-made, view state like infrastructure. In the end, the simplicity of ASP.NET MVC is rather the result of different architectural choices than some overhead in the design of the Web Forms model. So ASP.NET MVC brings to the table a clean design with a neat separation of concerns, a leaner run-time stack, full control over HTML, an unparalleled level of extensibility, and a working environment that enables, rather than penalizes, test-driven development (TDD). Is ASP.NET MVC, therefore, a true paradise for Web developers Just like with Web Forms, what some perceive as a clear strength of ASP.NET MVC, others may see as a weakness. To gain full control over HTML, JavaScript, and CSS, ASP.NET MVC requires that you write Web elements manually, one byte after the next. This means that, for the most part, you are responsible for writing every single <li> or <table> tag you need. In ASP.NET MVC, there s no sort of component model to help you with the generation of HTML. As of today, HTML helpers and perhaps user controls are the only tools you can leverage to write HTML more quickly. Overall, some developers may see ASP.NET MVC as taking an entire step backward in terms of usability and productivity. Note Because ASP.NET MVC supports pluggable view engines, you are not forced to express your desired presentation using HTML. You can consider adopting a non-HTML view engine to express the view you want and then have it converted to plain HTML. In both cases, though, you can rely on JavaScript libraries to help you create markup programmatically. Another point to be made, regarding the impact of ASP.NET MVC on everyday development, is that it requires some up-front familiarity with the MVC pattern. You need to know how controllers and views work together in the ASP.NET implementation. In other words, ASP.NET MVC is not something you can easily learn as you go. In my experience, this can be the source of decreased productivity for the average developer, especially for the average developer with some years of experience with Web Forms. Overall, the possible initial decrease of productivity is nothing dramatic and likely nothing to be seriously worried about, because it can be recovered in a matter of days with study and application. Likewise, it is something that shouldn t be ignored in order to prevent more serious worries and concerns. ASP.NET MVC requires full awareness of its features. Although it can sometimes look dangerously similar to Web Forms, it is (architecturally speaking) significantly different. In 5, I ll focus on this point while demonstrating how tricky it can prove to be using server controls in ASP.NET MVC.
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