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2012-02-24T21:07:16.923
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<p>I also ran into this, and found this thread. Here's a first pass:</p> <pre><code>namespace Foo { using System.ComponentModel.DataAnnotations; using System.Linq; /// <summary> /// Attribute class used to validate child properties. /// </summary> /// <remarks> /// See: http://stackoverflow.com/questions/2493800/how-can-i-tell-the-data-annotations-validator-to-also-validate-complex-child-pro /// Apparently the Data Annotations validator does not validate complex child properties. /// To do so, slap this attribute on a your property (probably a nested view model) /// whose type has validation attributes on its properties. /// This will validate until a nested <see cref="System.ComponentModel.DataAnnotations.ValidationAttribute" /> /// fails. The failed validation result will be returned. In other words, it will fail one at a time. /// </remarks> public class HasNestedValidationAttribute : ValidationAttribute { /// <summary> /// Validates the specified value with respect to the current validation attribute. /// </summary> /// <param name="value">The value to validate.</param> /// <param name="validationContext">The context information about the validation operation.</param> /// <returns> /// An instance of the <see cref="T:System.ComponentModel.DataAnnotations.ValidationResult"/> class. /// </returns> protected override ValidationResult IsValid(object value, ValidationContext validationContext) { var isValid = true; var result = ValidationResult.Success; var nestedValidationProperties = value.GetType().GetProperties() .Where(p => IsDefined(p, typeof(ValidationAttribute))) .OrderBy(p => p.Name);//Not the best order, but at least known and repeatable. foreach (var property in nestedValidationProperties) { var validators = GetCustomAttributes(property, typeof(ValidationAttribute)) as ValidationAttribute[]; if (validators == null || validators.Length == 0) continue; foreach (var validator in validators) { var propertyValue = property.GetValue(value, null); result = validator.GetValidationResult(propertyValue, new ValidationContext(value, null, null)); if (result == ValidationResult.Success) continue; isValid = false; break; } if (!isValid) { break; } } return result; } } } </code></pre>
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