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c ocr library

c ocr library

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As many aspects of ASP NET have stabilized and matured over the years, some interesting new features have appeared Of the new features, ASP NET application of the classic Model-View-Controller (MVC) software development pattern has probably received the most attention of all The ASP NET MVC framework represents an alternative to the ASP NET Web Forms environment Web Forms offers a structured, controls-based framework for generating Web pages Using Web Forms can make it feel like you re developing a desktop or rich client application even though the application UI is built upon HTML transmitted over a disconnected protocol The basis of a Web Forms page is a collection of server-side controls each one dedicated to emitting some HTML toward the output stream that eventually ends up at the client Web Forms offers developers great leverage through its ability to handle view state and its event model .

The Microsoft Visual Studio Designer has extensive support for Web Forms You can develop entire pages and not have to deal with much, if any, raw HTML By contrast, the MVC framework works closer to the metal That is, as a developer, you re on the hook to work with some raw HTML However, rather than leaving you in the wild to concoct a framework to manage the main application concerns (data and the UI), the MVC framework incorporates an industry-recognized software pattern for coordinating the two concerns The MVC model draws strict distinctions between an application s data, its rendering, and its request processing Each of these concerns is handled by a separate software component, and together they operate in concert with each other to handle HTTP requests This chapter covers how to use the ASP NET MVC framework to create Web pages ..

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The class named AnnotatedProduct contains data annotation attributes to implement the same rules as those applied by Validation block attributes in the Attributed Product class (which you saw in the previous example) However, due to the limitations with data annotations, the self-validation method within the class has to do more work to achieve the same validation rules For example, it has to check the minimum value of some properties as the data annotation attributes in version 35 of the NET Framework only support validation of the maximum value (in version 40, they do support minimum value validation) It also has to check the value of the DateDue property to ensure it is not more than six months in the future, and that the value of the ProductType property is a member of the ProductType enumeration.

Modern software is complex . As you ve seen so far, even developing Web applications using a framework that hides as much detail as ASP .NET does can become fairly involved . Many times, the complexity comes down to a problem of managing multiple concerns . For example, a typical ASP .NET application involves dealing with a data source (often a database),

This helps with cross-module communication because service consumers do not need a static reference to modules providing the service. This service can be used to send or receive data between modules.

making sure the HTML rendered by the application is in sync with the application state, and managing the incoming and outgoing message traffic By itself, ASP NET has separate components for managing these concerns ADO, LINQ, and the entity framework work well for talking to a database ASP NET data binding and the data-bound controls help to keep the client view of the data current Together with the ASP NET pipeline, the ASP NET control architecture hides the details of managing incoming and outgoing message traffic Although these features of ASP NET make Web development very approachable, there are other approaches to Web development MVC offers an alternative means for handling HTTP requests The MVC pattern is tailor-made for Web applications .

To perform the enumeration check, the self-validation method creates an instance of the Validation block Enum Conversion validator programmatically, and then calls its DoValidate method (which allows you to pass in all of the values required to perform the validation) The code passes to this method the value of the ProductType property,.

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