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POUsing Multiple Interfaces with MVC DataAnnotations and MetaDataType
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copied!<p>I am applying validation using DataAnnotations to an MVC ViewModel which is a composite of several entity framework objects and some custom logic. The validation is already defined for the entity objects in interfaces, but how can I apply this validation to the ViewModel?</p> <p>My initial idea was to combine the interfaces into one and apply the combined interface to the ViewModel, but this didn't work. Here's some sample code demonstrating what I mean:</p> <pre class="lang-cs prettyprint-override"><code>// interfaces containing DataAnnotations implemented by entity framework classes public interface IPerson { [Required] [Display(Name = "First Name")] string FirstName { get; set; } [Required] [Display(Name = "Last Name")] string LastName { get; set; } [Required] int Age { get; set; } } public interface IAddress { [Required] [Display(Name = "Street")] string Street1 { get; set; } [Display(Name = "")] string Street2 { get; set; } [Required] string City { get; set; } [Required] string State { get; set; } [Required] string Country { get; set; } } // partial entity framework classes to specify interfaces public partial class Person : IPerson {} public partial class Address : IAddress {} // combined interface public interface IPersonViewModel : IPerson, IAddress {} // ViewModel flattening a Person with Address for use in View [MetadataType(typeof(IPersonViewModel))] // <--- This does not work. public class PersonViewModel : IPersonViewModel { public string FirstName { get; set; } public string LastName { get; set; } public int Age { get; set; } public string Street1 { get; set; } public string Street2 { get; set; } public string City { get; set; } public string State { get; set; } public string Country { get; set; } } </code></pre> <p>My real-world problem involves about 150 properties on the ViewModel, so it's not as trivial as the sample and retyping all the properties seems like a horrible violation of DRY.</p> <p>Any ideas on how to accomplish this?</p>

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