Validation does not work when I use Validator.TryValidateObject

Question

DataAnnotations does not work with buddy class. The following code always validate true. Why ?

var isValid = Validator.TryValidateObject(new Customer(), Context, res

Answer 1

After some research I couldn't find any reason why TryValidateObject always return true if I use MetadataType (buddy class). But it works with the following code (xVal).

    public static IEnumerable GetErrors(object instance, string name)
    {
        var metadataAttrib = instance.GetType()
                .GetCustomAttributes(typeof(MetadataTypeAttribute), true)
                .OfType().FirstOrDefault();
        var buddyClassOrModelClass = metadataAttrib != null
                ? metadataAttrib.MetadataClassType
                : instance.GetType();
        var buddyClassProperties = TypeDescriptor.GetProperties(buddyClassOrModelClass)
            .Cast();
        var modelClassProperties = TypeDescriptor.GetProperties(instance.GetType())
            .Cast();

        var list = from buddyProp in buddyClassProperties
                   join modelProp in modelClassProperties on
                            buddyProp.Name equals modelProp.Name
                   from attribute in buddyProp.Attributes.OfType()
                   where !attribute.IsValid(modelProp.GetValue(instance))
                   select new ErrorInfo(
                       buddyProp.Name,
                       attribute.FormatErrorMessage(modelProp.Name),
                       instance);

        if (name != null)
            list = list.Where(x => x.PropertyName == name);

        return list;
    }