asp.net qr code generator Part II The Core of ASP.NET MVC in Visual Basic .NET

Creating QR 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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Note Implemented through attributes, data annotations are an emerging cross-platform .NET
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solution for building a view-specific object model that might or might not coincide with the domain model you have in the business layer. You can use data annotations with Entity Framework classes or with classes in your own handmade data model, and you can have components that understand annotations in Microsoft Silverlight, ASP.NET Dynamic Data, Windows Presentation Foundation (WPF), and ASP.NET MVC. From a design perspective, this means planning a viewmodel on the presentation layer and possibly having an adapter layer in the business layer to map from view-model objects to domain model objects. The presentation and business data models, though, can coincide if that simplifies your efforts while not compromising the overall design.
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Flavors of a Templated Helper
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In ASP.NET MVC 2, you have two essential templated helpers: Editor and Display. They work together to make the code for labeling, displaying, and editing data objects easy to write and maintain. The optimal scenario for using these helpers is that you are writing your lists or input forms around annotated objects. However, the new family of templated helpers can work with both scalar values and composite objects. Templated helpers actually come with three overloads. Taking the Display helper as an example, you have the following more specific helpers Display, DisplayFor, and DisplayForModel. There s no functional difference between Display, DisplayFor, and DisplayForModel. They differ only by the input parameters they can manage. The Display helper accepts a string indicating the name of the property in the ViewData dictionary or on the model to be processed. Note that you don t have to know the exact type of the model in order to use this helper.
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<%= Html.Display("FirstName") %>
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The DisplayFor helper accepts a model-based expression and subsequently requires that the model type is known within the view. (The ViewPage or ViewUserControl must be strongly typed.)
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<%= Html.DisplayFor(model => model.FirstName) %>
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Finally, DisplayForModel is a shortcut for DisplayFor getting the expression model => model.
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<%= Html.DisplayForModel() %>
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You can use DisplayForModel even if you don t know the exact type of the model inside of the view context. I ll be referring to templated editors using the main name that identifies the functionality such as Display or Editor. All flavors of templated helpers have the special ability to process metadata (if any) and adjust their rendering accordingly for example, showing labels and adding validation. The display and editing capabilities can be customized using templates, as discussed in a moment. The ability of using custom templates applies to all flavors of a templated helper.
5 Inside Views
Editing Helpers in Action
The purpose of the Editor helper is to let you edit the specified value or object. The editor recognizes the type of the value it gets and picks up a made-to-measure template for editing. Predefined templates exist for object, string, Boolean, and multiline text, while numbers, dates, and GUIDs fall back to the string editor. The helper editor works great with complex types. It generically iterates over each public property and builds up a label and an editor for the child value. Nested objects are supported natively. You can customize the editor by creating a few partial views by convention in the EditorTemplates folder of the view. It can be under a controller-specific subfolder or under the Views\Shared folder as well. (See Figure 5-8.)
FIGuRE 5-8 Custom templates for editors and visualizers in Visual Studio 2010.
When you invoke an editor for a given type, you can then point the editor to your template. Here s an example that uses the date.ascx view to edit a DateTime property:
<fieldset> <legend>Personal Information</legend> ... <p> <%= Html.LabelFor(p => person.Birthdate)%> <%= Html.EditorFor(p => person.Birthdate, "Date") %> </p> </fieldset>
Part II The Core of ASP.NET MVC
Let s have a look at the internals of the date.ascx template:
<%@ Control Language="C#" Inherits="System.Web.Mvc.ViewUserControl" %> <%@ Import Namespace="Samples" %> <table> <tr> <td><%= <td><%= </tr> <tr> <td><%= <td><%= </tr> <tr> <td><%= <td><%= </tr> </table>
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