Validator.TryValidateProperty不工作

问题描述

我想实现Validator.TryValidateProperty，即使是有[必需] DataAnnotation，该TryValidateProperty返回有效响应。

下面是我的客户部分类：

  [MetadataType（typeof运算（Customer.Metadata））]
公共部分类客户：全球:: System.Data.Objects.DataClasses.EntityObject
{
   ...
私人密封类的元数据
    {

        [需要]
        [SSNValidAttribute（的ErrorMessage =核潜艇应该是9数字字符，没有任何标点符号。）
        [DisplayName的（SSN）]
        公共字符串SSN {获得;组; }
...
 

这里是code即返回true：

  ...
VAR的客户=新客户（）;
            customer.SSN =;
            VAR VC =新ValidationContext（客户，NULL，NULL）;
            vc.MemberName =SSN;
            VAR解析度=新的名单，其中，为ValidationResult＆GT;（）;
            VAR的结果= Validator.TryValidateProperty（customer.SSN，VC，水库）;
...
 

解决方案

好刚发现的解决方案来处理密封MetadataType类！

  VAR的客户=新客户（）;
        TypeDescriptor.AddProviderTransparent
        （新AssociatedMetadataTypeTypeDescriptionProvider
            （customer.GetType（）），customer.GetType（））;
        customer.SSN =;
        VAR VC =新ValidationContext（客户，NULL，NULL）;
        vc.MemberName =SSN;
        VAR解析度=新的名单，其中，为ValidationResult＆GT;（）;
        VAR的结果= Validator.TryValidateProperty（customer.SSN，VC，水库）;
 

我不得不添加以下内容：

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

在找到这个地址的解决方案：http://forums.silverlight.net/forums/p/149264/333396.aspx

I am trying to implement Validator.TryValidateProperty and even though there is a [Required] DataAnnotation, the TryValidateProperty returns a valid response.

Here is my Customer partial class:

[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; }
...

And here is the code that is returning True:

...
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);
...

解决方案

Ok JUST found the solution for dealing with the sealed MetadataType class!!!

        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);

I had to add the following:

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

Found solution at this address:http://forums.silverlight.net/forums/p/149264/333396.aspx

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