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    <p>It's more than two years but recently I was struggling with the same problem using the same method. </p> <p>My solution to that problem is to get all DependencyProperties of object using reflection instead of using GetLocalValueEnumerator which is not working corectlly with DataTemplates.</p> <p>Code:</p> <pre><code> public static bool IsValid(DependencyObject parent) { // Validate all the bindings on the parent bool valid = true; var infos = parent.GetType().GetFields( BindingFlags.Public | BindingFlags.FlattenHierarchy | BindingFlags.Instance | BindingFlags.Static).Where(f =&gt; f.FieldType == typeof(DependencyProperty)); foreach (FieldInfo field in infos) { var dp = (DependencyProperty)field.GetValue(null); if (BindingOperations.IsDataBound(parent, dp)) { Binding binding = BindingOperations.GetBinding(parent, dp); foreach (ValidationRule rule in binding.ValidationRules) { ValidationResult result = rule.Validate(parent.GetValue(dp), null); if (!result.IsValid) { BindingExpression expression = BindingOperations.GetBindingExpression(parent, dp); Validation.MarkInvalid(expression, new ValidationError(rule, expression, result.ErrorContent, null)); valid = false; } } } } // Validate all the bindings on the children for (int i = 0; i != VisualTreeHelper.GetChildrenCount(parent); ++i) { DependencyObject child = VisualTreeHelper.GetChild(parent, i); if (!IsValid(child)) { valid = false; } } return valid; } </code></pre> <p>This code works only with Properties owned by the object to extend it for attached properties you can use this code:</p> <pre><code> public static List&lt;DependencyProperty&gt; GetAttachedProperties(Object element) { List&lt;DependencyProperty&gt; attachedProperties = new List&lt;DependencyProperty&gt;(); System.Windows.Markup.Primitives.MarkupObject markupObject = System.Windows.Markup.Primitives.MarkupWriter.GetMarkupObjectFor(element); if (markupObject != null) { foreach (System.Windows.Markup.Primitives.MarkupProperty mp in markupObject.Properties) { if (mp.IsAttached) { attachedProperties.Add(mp.DependencyProperty); } } } return attachedProperties; } </code></pre>
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