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，我在为客户端验证发出 JavaScript 时遇到问题。下面是一个模型示例，它可以很好地处理两个必填字段，后跟发出的 JavaScript：

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});
//]]> 

一旦我在 EmailAddress 字段上放置另一个属性（正则表达式属性），JavaScript 就不再发出任何规则。请注意，下面的 JavaScript 中只有一个空数组，其中应该包含规则。这是更改和脚本。有什么想法吗？

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});
//]]> 

有什么想法导致添加新属性时规则消失吗？

谢谢！

Answer 1

经过进一步调查，问题是你的正则表达式被破坏了，因为你连续指定了两个量词：

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

所有规则似乎消失的原因是因为 CLR 吞下了属性构造函数的异常，并只是告诉你“对不起” ，这里没有属性。”