Validator.TryValidateProperty不起作用

如何解决Validator.TryValidateProperty不起作用

|| 我正在尝试实现Validator.TryValidateProperty，即使存在[required] DataAnnotation，TryValidateProperty也会返回有效响应。 这是我的客户局部类：

[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; }
...

这是返回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);
...

    

解决方法

        好的，刚刚找到了处理密封的

MetadataType

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);

我必须添加以下内容：

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

在此地址找到解决方案： http://forums.silverlight.net/forums/p/149264/333396.aspx