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    <p>Here is one solution to my problem where I can use the built in required attribute and still get custom behavior. This is just some proof of concept code.</p> <p>The model:</p> <pre><code>public class Page : IPageModel { [Display(Name = "Page", Prompt = "Specify page name...")] [Required(ErrorMessage = "You must specify a page name")] public PageReference PageReference { get; set; } } </code></pre> <p>The model binder:</p> <pre><code>public class PageModelBinder : DefaultModelBinder { protected override void OnModelUpdated(ControllerContext controllerContext, ModelBindingContext bindingContext) { foreach (PropertyDescriptor property in TypeDescriptor.GetProperties(bindingContext.ModelType)) { var attributes = property.Attributes; if (attributes.Count == 0) continue; foreach (var attribute in attributes) { if (attribute.GetType().BaseType == typeof(ValidationAttribute) &amp;&amp; property.PropertyType == typeof(PageReference)) { var pageReference = bindingContext.ModelType.GetProperty(property.Name).GetValue(bindingContext.Model, null) as PageReference; Type attrType = attribute.GetType(); if (attrType == typeof (RequiredAttribute) &amp;&amp; string.IsNullOrEmpty(pageReference.Name)) { bindingContext.ModelState.AddModelError(property.Name, ((RequiredAttribute) attribute).ErrorMessage); } } } } base.OnModelUpdated(controllerContext, bindingContext); } } </code></pre> <p>The model binder provider:</p> <pre><code>public class InheritanceAwareModelBinderProvider : Dictionary&lt;Type, IModelBinder&gt;, IModelBinderProvider { public IModelBinder GetBinder(Type modelType) { var binders = from binder in this where binder.Key.IsAssignableFrom(modelType) select binder.Value; return binders.FirstOrDefault(); } } </code></pre> <p>And last the global.asax registration:</p> <pre><code>var binderProvider = new InheritanceAwareModelBinderProvider {     { typeof (IPageModel), new PageModelBinder() }     }; ModelBinderProviders.BinderProviders.Add(binderProvider); </code></pre> <p>The result: <a href="http://cl.ly/IjCS" rel="nofollow">http://cl.ly/IjCS</a></p> <p>So what do you think about this solution?</p>
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    1. USNat Ritmeyer
    1. USMarcus
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    1. COModel binder shouldn't be responsible for validation, it should only perform binding. Validators should perform validation. You should move your code to custom validator.
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      1. USJakub Konecki
    2. CO@JakubKonecki I have tried to move the code and use IValidatableObject but I can't figure out how to validate the Bar class based on an attribute in the Foo class. I think a model binder is the only way here but if there is another way, please let me know!
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    3. COyou don't need to validate `Bar` class, you want to validate `MyProp` property in `Foo`, don't you? All you need to do is to check if `MyProp` is `null`.
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      1. USJakub Konecki
 

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