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POASP.NET MVC 2 Model encapsulated within ViewModel Validation
 

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  1. POASP.NET MVC 2 Model encapsulated within ViewModel Validation
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    <p>I am trying to get validation to work in ASP.NET MVC 2, but without much success.</p> <p>I have a complex class containing a large number of fields. (Don't ask - this is oneo f those real-world situations best practices can't touch) This would normally be my Model and is a LINQ-to-SQL generated class. </p> <p>Because this is generated code, I have created a MetaData class as per <a href="http://davidhayden.com/blog/dave/archive/2009/08/10/AspNetMvc20BuddyClassesMetadataType.aspx" rel="nofollow noreferrer">http://davidhayden.com/blog/dave/archive/2009/08/10/AspNetMvc20BuddyClassesMetadataType.aspx</a>.</p> <pre><code>public class ConsultantRegistrationMetadata { [DisplayName("Title")] [Required(ErrorMessage = "Title is required")] [StringLength(10, ErrorMessage = "Title cannot contain more than 10 characters")] string Title { get; set; } [Required(ErrorMessage = "Forename(s) is required")] [StringLength(128, ErrorMessage = "Forename(s) cannot contain more than 128 characters")] [DisplayName("Forename(s)")] string Forenames { get; set; } // ... </code></pre> <p>I've attached this to the partial class of my generated class:</p> <pre><code>[MetadataType(typeof(ConsultantRegistrationMetadata))] public partial class ConsultantRegistration { // ... </code></pre> <p>Because my form is complex, it has a number of dependencies, such as SelectLists, etc. which I have encapsulated in a ViewModel pattern - and included the ConsultantRegistration model as a property:</p> <pre><code>public class ConsultantRegistrationFormViewModel { public Data.ConsultantRegistration ConsultantRegistration { get; private set; } public SelectList Titles { get; private set; } public SelectList Countries { get; private set; } // ... </code></pre> <p>So it is essentially ViewModel=>Model</p> <p>My View then has:</p> <pre><code> &lt;p&gt; &lt;%: Html.LabelFor(model =&gt; model.ConsultantRegistration.Title) %&gt; &lt;%: Html.DropDownListFor(model =&gt; model.ConsultantRegistration.Title, Model.Titles,"(select a Title)") %&gt; &lt;%: Html.ValidationMessage("Title","*") %&gt; &lt;/p&gt; &lt;p&gt; &lt;%: Html.LabelFor(model =&gt; model.ConsultantRegistration.Forenames) %&gt; &lt;%: Html.TextBoxFor(model =&gt; model.ConsultantRegistration.Forenames) %&gt; &lt;%: Html.ValidationMessageFor(model=&gt;model.ConsultantRegistration.Forenames) %&gt; &lt;/p&gt; </code></pre> <p>The problem is, the validation attributes on the metadata class are having no effect. I tried doing it via an Interface, but also no effect. I'm beginning to think that the reason is because I am encapsulating my model within a ViewModel.</p> <p>My Controller (Create Action) is as follows:</p> <pre><code>[HttpPost] public ActionResult Create(Data.ConsultantRegistration consultantRegistration) { if (ModelState.IsValid) // this is always true - which is wrong!! { try { consultantRegistration = ConsultantRegistrationRepository.SaveConsultantRegistration(consultantRegistration); return RedirectToAction("Edit", new { id = consultantRegistration.ID, sectionIndex = 2 }); } catch (Exception ex) { ModelState.AddModelError("CreateException",ex); } } return View(new ConsultantRegistrationFormViewModel(consultantRegistration)); } </code></pre> <p>As outlined in the comment, the ModelState.IsValid property always returns true, despite fields with the Validaiton annotations not being valid. (Forenames being a key example).</p> <p>Am I missing something obvious - considering I am an MVC newbie? I'm after the mechanism demoed by Jon Galloway at <a href="http://www.asp.net/learn/mvc-videos/video-10082.aspx" rel="nofollow noreferrer">http://www.asp.net/learn/mvc-videos/video-10082.aspx</a>.</p> <p>(Am aware t is similar to <a href="https://stackoverflow.com/questions/1260562/asp-net-mvc-model-viewmodel-validation">ASP.NET MVC Model/ViewModel Validation</a> but that post seems to talk about xVal. I have no idea what that is and suspect it is for MVC 1)</p>
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