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POMVC2 DataAnnotations validation with inheritance
 

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  1. POMVC2 DataAnnotations validation with inheritance
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    <p>I have a .NET 2.0 class the properties of which are marked virtual.I need to use the class as a model in a MVC2 application. So, I have created a .NET 3.5 class inheriting from the .NET 2.0 class and added the DataAnnotations attributes to the overriden properties in the new class. A snippet of what I have done is below</p> <pre><code>// .NET 2.0 class public class Customer { private string _firstName = ""; public virtual string FirstName { get { return _firstName; } set { _firstName = value; } } } // .NET 3.5 class public class MVCCustomer : Customer { [Required(ErrorMessage="Firstname is required")] public override string FirstName { get { return base.FirstName; } set { base.FirstName = value; } } } </code></pre> <p>I have used the class as the model for a MVC2 view using the HtmlFor helpers. Serverside validation works correctly but the client side validation does not. Specifically the validation error is not displayed on the page. </p> <p>What am I missing, or is it only possible to do this using buddy classes.</p> <p>Thanks.</p> <p>EDIT 1: I have now tried this with buddy validation classes and that doesn't work either.</p> <p>EDIT 2: I have now worked out that the lambda expression supplied to the HtmlFor helpers is causing the problem. For e.g.</p> <p>Html.TextBoxFor(m => m.FirstName) calls the ModelMetadata.FromLambdaExpression method which evaluates the DeclaringType of the MemberExpression (expression.Body) as the Customer class and not the MVCCustomer class.</p> <p>I have tried changing the lambda expression to Html.TextBoxFor((MVCCustomer m) => m.FirstName) but the DeclaringType is still Customer.</p> <p>Is there a way I can get the DeclaringType to be of type MVCCustomer and not Customer.</p>
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    1. USJon Seigel
    1. USbhiku
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    1. CODid you call EnableClientValidation?
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    2. COYes, EnableClientValidation is called from the aspx page.
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