asp.net-mvc-3 – 自定义RegularExpressionAttribute缺少数据-va

[AttributeUsage(AttributeTargets.Property | AttributeTargets.Field,AllowMultiple = false)]
public class AlphaNumericAttribute: RegularExpressionAttribute,IClientValidatable
{
    public AlphaNumericAttribute()
      : base("^[-A-Za-z0-9]+$")
    {
    }

   public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata,ControllerContext context)
   {
      yield return new ModelClientValidationRule { ErrorMessage =  FormatErrorMessage(metadata.GetDisplayName()),ValidationType = "alphanumeric" };
   }
}

ViewModel中的字段使用我的AlphaNumeric属性进行修饰：

[AlphaNumeric(ErrorMessageResourceType = typeof(Resources),ErrorMessageResourceName = Resources.DriverLicenseNumber_RegexError_)]
public string DriverLicenseNumber { get; set; }

该字段构建在视图中：

@using (Html.BeginForm("Index","Application",FormMethod.Post,new { id = "applicationDataForm",autocomplete = "off" }))
{
    @Html.LabelFor(m => m.DriverLicenseNumber)
    @Html.ValidationMessageFor(m => m.DriverLicenseNumber)
    @Html.TextBoxFor(m => m.DriverLicenseNumber)
}

这应该在我的html输入标记上产生适当的“数据 – ”验证属性.但是,呈现的标记如下所示：

<input data-val="true" data-val-alphanumeric="Please enter a valid driver's license number." id="DriverLicenseNumber" name="DriverLicenseNumber" type="text" value="" maxlength="20" class="valid">

显然不存在应该呈现的data-val-regex和data-val-regex-pattern属性.

我已经构建了具有完全相同结构的其他验证器,并且它们正常工作,就像这个SSN验证一样,它使用jquery掩码处理屏蔽输入的屏蔽空间：

public class SsnAttribute : RegularExpressionAttribute,IClientValidatable
{
  public SsnAttribute()
  : base("^([0-9]{3}–[0-9]{2}–[0-9]{4})|([?]{3}–[?]{2}–[?]{4})|([0-9]{9,9})$")
{
}

public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata,ControllerContext context)
{
  yield return new ModelClientValidationRule { ErrorMessage = FormatErrorMessage(metadata.GetDisplayName()),ValidationType = "ssn" };
}

}

随着ViewModel上附带的应用程序：

[Ssn(ErrorMessageResourceType = typeof(Resources),ErrorMessageResourceName = Resources.SocialSecurity_RegexError_)]
public new string SocialSecurityNumber { get; set; }

该字段构建在视图中：

@using (Html.BeginForm("Index",autocomplete = "off" }))
{
    @Html.LabelFor(m => m.SocialSecurityNumber)
    @Html.ValidationMessageFor(m => m.SocialSecurityNumber)
    @Html.TextBoxFor(m => m.SocialSecurityNumber)
}

此验证属性正确呈现data-val-regex和data-val-regex-pattern属性：

<input class="SSNMask valid" data-val="true" data-val-regex="Please enter a valid social security number." data-val-regex-pattern="^([0-9]{3}–[0-9]{2}–[0-9]{4})|([?]{3}–[?]{2}–[?]{4})|([0-9]{9,9})$" id="SocialSecurityNumber" name="SocialSecurityNumber" type="text" value="" maxlength="22">

我无法弄清楚我在AlphaNumeric属性中缺少什么,它没有呈现相应的html属性.