Part III Programming Features in VB.NET

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Part III Programming Features
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As you can see, a bunch of validators can be registered with ASP.NET MVC, and they will be called in sequence to validate the model. A validator is a class that inherits from ModelValidator.
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public abstract class ModelValidator { public virtual IEnumerable<ModelClientValidationRule> GetClientValidationRules(); public abstract IEnumerable<ModelValidationResult> Validate(object container); protected internal ControllerContext ControllerContext { get; private protected internal ModelMetadata Metadata { get; private set; } } set; }
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A validator has two methods one for validating the state of a server-side object and one for validating input available within the browser. A validator works by checking real values stored in the object against provided metadata. In ASP.NET MVC 2, model metadata is a set of information defined in the public class ModelMetadata. Only one metadata provider is registered by default, and it is the DataAnnotationsModelMetadataProvider class. Metadata information based on data annotations are then processed by up to three default validators: DataAnnotationsModelValidatorProvider, ClientDataTypeModelValidatorProvider, and DataErrorInfoModelValidatorProvider. As far as model binding is concerned, the default behavior in ASP.NET MVC 2 is that data annotation attributes are used to express display and validation metadata for a type. These annotations are validated by the default validators (on both the browser and the server side) and any errors are reported to the model state.
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Validating Annotated Objects
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Let s experience the combined power of data annotation metadata, templated helpers, and model binders in ASP.NET MVC 2. The following class is a typical view model class used to gather data being posted by an input form. The class is expected to add a new memo into a system. The memo includes an automatically generated ID, a title, the owner s name, the priority level, the due date, an e-mail address to use to follow up, and a flag indicating whether or not the memo has to show up in the calendar.
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public class MemoViewModel { [HiddenInput(DisplayValue = false)] public int Id { get; set; } [Required] [DisplayName("Title")] [StringLength(20, ErrorMessage = "Too long, cut your text.")] public String Title { get; set; } [Required] [DisplayName("Owner")]
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7 Data Entry in ASP.NET MVC
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[RegularExpression(@"^[a-zA-Z''-'\s]{1,10}$")] public String OwnerName { get; set; } [Required] [Range(1,5)] [DisplayName("Priority")] public int Priority { get; set; } [Required] [DisplayName("Due by")] [DataType(DataType.Date)] public DateTime DueBy { get; set; } [DisplayName("Show on calendar")] public bool ShowOnCalendar { get; set; } [RegularExpression(@"\w+([-+.']\w+)*@\w+([-.]\w+)*\.\w+([-.]\w+)*")] [DataType(DataType.EmailAddress)] [DisplayName("Follow up")] public String FollowupEmail { get; set; } }
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To arrange an input form around this class, here s what you can do:
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<h2>Create a new memo</h2> <hr /> <% using (Html.BeginForm()) { %> <%= Html.ValidationSummary(true) %> <div> <fieldset> <legend>Memo</legend> <p> <%= Html.EditorForModel() %> </p> <p> <input type="submit" value="Save" /> </p> </fieldset> </div> <% } %>
The EditorForModel HTML helper is a shortcut for editing the entire object being passed as the model in the view page:
<%@ Page ... Inherits="System.Web.Mvc.ViewPage<MemoViewModel>" %>
From a controller action, you ask to render the form just shown and what you get looks like Figure 7-7.
Part III Programming Features
FIGuRE 7-7 An input form automatically created by the editor templates
When you submit the form, any content will be bound to an HTTP POST enabled action, as shown here:
[HttpPost] public ActionResult Index(MemoViewModel model) { return View(); }
Note In ASP.NET MVC 2, a new set of attributes has been introduced to make it simpler for you to restrict the controller s action method to certain HTTP verbs. The AcceptVerbs attribute introduced in ASP.NET MVC is still the repository of any code that selects a method for execution. However, its use is now simplified by more direct and parameterless wrapper attributes such as HttpPost, HttpGet, HttpPut, and HttpDelete. Which approach you use is purely a matter of preference because HttpPost and the others are implemented in terms of the underlying AcceptVerbs attribute. See 4, Inside Controllers, for more information. During the binding process, the actual content of the data being mapped to the model is checked carefully against the metadata in the class definition. Errors are reported as shown in Figure 7-8.
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