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    <p>The <code>TryValidateModel</code> method only goes down one level so it only checks for <code>Validation</code> attributes on the object of type <code>B</code>, not on its nested objects. One way to overcome this is to define your own implementation of a <code>ValidationAttribute</code>:</p> <pre><code>public class ListValidationAttribute : ValidationAttribute { public override bool IsValid(object value) { IEnumerable enumerable = value as IEnumerable; // If the input object is not enumerable it's considered valid. if (enumerable == null) { return true; } foreach (object item in enumerable) { // Get all properties on the current item with at least one // ValidationAttribute defined. IEnumerable&lt;PropertyInfo&gt; properties = item.GetType(). GetProperties().Where(p =&gt; p.GetCustomAttributes( typeof(ValidationAttribute), true).Count() &gt; 0); foreach (PropertyInfo property in properties) { // Validate each property. IEnumerable&lt;ValidationAttribute&gt; validationAttributes = property.GetCustomAttributes(typeof(ValidationAttribute), true).Cast&lt;ValidationAttribute&gt;(); foreach (ValidationAttribute validationAttribute in validationAttributes) { object propertyValue = property.GetValue(item, null); if (!validationAttribute.IsValid(propertyValue)) { // Return false if one value is found to be invalid. return false; } } } } // If everything is valid, return true. return true; } } </code></pre> <p>Now <code>List&lt;A&gt;</code> can be validated using the attribute:</p> <pre><code>public class B { [ListValidation] public List&lt;A&gt; Values { get; set; } } </code></pre> <p>I haven't tested performance for the above approach thoroughly but if in your case that turns out to be a problem, an alternative approach is to use a helper function:</p> <pre><code> if (!ValidateB(instanceofB)) { //this should fire, as one of A inside B isn't valid. return View(instanceofB); } ... public bool ValidateB(B b) { foreach (A item in b.Values) { if (!TryValidateModel(item)) { return false; } } return true; } </code></pre>
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    1. POASP.Net MVC 2 Controller's TryValidate doesn't validate the List<> items within the model
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    1. COMarking this as the correct answer for now... ideally would like to have the children marked appropriately for modelstate errors, but for now doing child errors by hand...
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    2. CO@Jeroen: Can you tell me how you learned about the fact that TryValidateModel would only work on one level and not on the child item?
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    3. CO@DavidS: Checking it with a class browser (Reflector, IL Spy).
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Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

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