c# - Validator.TryValidateProperty不起作用

我正在尝试实现validator.tryValidateProperty，即使存在[必需的]dataAnnotation，tryValidateProperty也会返回有效的响应。
这是我的客户部分课程：

[MetadataType(typeof(Customer.Metadata))]
public partial class Customer : global::System.Data.Objects.DataClasses.EntityObject
{
   ...
private sealed class Metadata
    {

        [Required]
        [SSNValidAttribute(ErrorMessage = "The SSN should be 9 numeric characters without any punctuation.")]
        [DisplayName("SSN")]
        public String SSN { get; set; }
...

下面是返回true的代码：

...
var customer = new Customer();
            customer.SSN = "";
            var vc = new ValidationContext(customer, null, null);
            vc.MemberName = "SSN";
            var res = new List<ValidationResult>();
            var result = Validator.TryValidateProperty(customer.SSN, vc, res);
...

最佳答案

好的，刚刚找到了处理sealedMetadataType类的解决方案。

var customer = new Customer();
TypeDescriptor.AddProviderTransparent
(new AssociatedMetadataTypeTypeDescriptionProvider
    (customer.GetType()), customer.GetType());
customer.SSN = "";
var vc = new ValidationContext(customer, null, null);
vc.MemberName = "SSN";
var res = new List<ValidationResult>();
var result = Validator.TryValidateProperty(customer.SSN, vc, res);

我必须补充以下内容：

TypeDescriptor.AddProviderTransparent
(new AssociatedMetadataTypeTypeDescriptionProvider
    (customer.GetType()), customer.GetType());

在以下地址找到解决方案：
http://forums.silverlight.net/forums/p/149264/333396.aspx