asp.net barcode Part II The Core of ASP.NET MVC in Visual Basic .NET

Encoder Denso QR Bar Code in Visual Basic .NET Part II The Core of ASP.NET MVC

Part II The Core of ASP.NET MVC
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FIGuRE 5-6 An ASP.NET MVC view renders out a book s table of contents.
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Important Without beating around the bush, the code of a typical ASP.NET MVC view may be quite confusing at first. It s really kind of shocking for the average ASP.NET developer to see. Often, the first (sometimes unconfessed) thought of the developer is that ASP.NET MVC is a huge step backwards from classic ASP.NET. However, I have deliberately chosen to use some messed-up code that I definitely do not recommended that you write. That code works just fine, but it is hard to read and subsequently hard to maintain.
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In an ASP.NET MVC view, you should try to keep the logic in code blocks to a minimum and avoid intertwined sequences of code and markup. Some developers say you should never have even an if in the view; some others, including myself, say that, well, some simple rendering logic (loops and ifs) are acceptable. By keeping the view as passive as possible one of the goals of the MVC pattern, indeed you reduce the view to a plain HTML template with some data placeholders and avoid creating code paths in the template. That said, however, more control over HTML means just this writing plain HTML literals with the necessary amount of logic and data for the purpose you have in mind. Finally, if you have trouble with the HTML syntax and the way in which ASP.NET intertwines it with code, you can unplug the default view engine and roll your own or use any other publicly available view engine. Spark and NVelocity are two view engines that many developers love. NVelocity,in particular, is the .NET porting of a popular Java template-based tool for view generation. (See http://www.CodePlex.com/MvcContrib.)
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Code Blocks
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Code blocks are fragments of executable code delimited by <% . . . %> tags. Within those tags, you can put virtually everything that the ASP runtime engine can understand and parse,
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5 Inside Views
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including variable assignments, loop statements, function declarations and, of course, function calls. For compatibility reasons with old ASP, the internal architecture of classic ASP.NET pages always supported this programming model, which appears unstructured, loose, not very rigorous, and inelegant to software purists and to, well, not just them. This overlooked approach to page construction, however, has been revamped to have new significance in ASP.NET MVC because of its inherent flexibility and because it allows full control over HTML. Code blocks come in two flavors: inline code and inline expressions. Inline expressions are merely shortcuts for Response.Write and preface the expression with an = (equal) symbol:
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<!-- Sample inline expression --> <% = ViewData["ID"] %>
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Inline code is plain code in code block brackets and requires a trailing semi-colon. An inline expression outputs the value of the expression in the output stream; an inline code block simply executes the specified code to create or modify some local state. Code blocks are compiled into methods added to the page that ASP.NET creates dynamically when processing the view for the first time. Any code block is associated with a server-side parent element that inherits from Control. It s associated with the page if no element can be found with the runat attribute. (The Page class does have the Control class in its list of ancestors.) Why Control Because the Control class defines a little-used method named SetRenderMethodDelegate. This method takes a delegate method and uses it to render some markup. Here s an excerpt from the render delegate that ASP.NET uses to render the mix of markup and code blocks shown earlier:
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void __Render__control1(HtmlTextWriter __w, Control parameterContainer) { int currentPart = 0; foreach ( ch in this.ViewData.Model.s) { if (ch.PartNo > currentPart) { if (currentPart > 0) { __w.Write("\r\n </ul>\r\n"); } currentPart = ch.PartNo; __w.Write(" \r\n \r\n <h3>Part "); __w.Write(ch.PartNo ); __w.Write("</h3>\r\n <hr />\r\n <ul>\r\n"); } ... } }
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