ASP.NET MVC 2 RC-使用数据注释的客户端验证因多个属性而失败

Question

在模型上使用数据注释时，我无法发出用于客户端验证的JavaScript。 这是一个模型示例，可以在两个必填字段以及发出的JavaScript的情况下正常工作：

public class LoginUserViewModel
    {
        [Required(ErrorMessage = "Email required")]
        public string EmailAddress { get; set; }

        [Required(ErrorMessage="Password required")]
        public string Password { get; set; }
    }
}

//<![CDATA[
if (!window.mvcClientValidationMetadata) { window.mvcClientValidationMetadata = []; }
window.mvcClientValidationMetadata.push({"Fields":[{"FieldName":"EmailAddress","ReplaceValidationMessageContents":true,"ValidationMessageId":"form0_EmailAddress_validationMessage","ValidationRules":[{"ErrorMessage":"Email required","ValidationParameters":{},"ValidationType":"required"}]},{"FieldName":"Password","ReplaceValidationMessageContents":true,"ValidationMessageId":"form0_Password_validationMessage","ValidationRules":[{"ErrorMessage":"Password required","ValidationParameters":{},"ValidationType":"required"}]}],"FormId":"form0","ReplaceValidationSummary":false});
//]]> 

只要将另一个属性（即正则表达式属性）放在EmailAddress字段上，JavaScript就不再发出任何规则。 请注意，在下面的JavaScript中，规则应位于的位置只有一个空数组。 这是更改和脚本。 有任何想法吗？

public class LoginUserViewModel
    {
        [Required(ErrorMessage = "Email required")]
        [RegularExpression(@"^[a-z0-9]+([-+\.]*[a-z0-9]+)*@[a-z0-9]+([-\.][a-z0-9]+)*{2,4}$", ErrorMessage = "Invalid email format")]
        public string EmailAddress { get; set; }

        [Required(ErrorMessage="Password required")]
        public string Password { get; set; }
    }

//<![CDATA[
if (!window.mvcClientValidationMetadata) { window.mvcClientValidationMetadata = []; }
window.mvcClientValidationMetadata.push({"Fields":[{"FieldName":"EmailAddress","ReplaceValidationMessageContents":true,"ValidationMessageId":"form0_EmailAddress_validationMessage","ValidationRules":[]},{"FieldName":"Password","ReplaceValidationMessageContents":true,"ValidationMessageId":"form0_Password_validationMessage","ValidationRules":[{"ErrorMessage":"Password is required.","ValidationParameters":{},"ValidationType":"required"}]}],"FormId":"form0","ReplaceValidationSummary":false});
//]]> 

有什么想法在添加新属性时导致规则消失的原因是什么？

谢谢！

Answer 1

经过进一步研究后，问题在于您的正则表达式已损坏，因为您已背对背指定了两个量词：

parsing "[a-z0-9]+([-+\.]*[a-z0-9]+)*@[a-z0-9]+([-\.][a-z0-9]+)*{2,4}"
- Nested quantifier {.

所有规则似乎都消失的原因是，CLR吞噬了属性构造函数的异常，只是告诉您“抱歉，这里没有属性”。