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在模型上使用数据注释时，我遇到了为客户端验证发出的 JavaScript 的问题。这是一个模型示例，它可以很好地处理两个必填字段，然后是发出的 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});
//]]>

只要我在 EmailAddress 字段上放置另一个属性，即正则表达式属性，JavaScript 就不再发出任何规则。请注意，在下面的 JavaScript 中，规则应该是一个空数组。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});
//]]>

任何想法是什么导致添加新属性时规则消失？

谢谢！

4

1 回答 1

6

经过进一步调查，问题在于您的正则表达式已损坏，因为您已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 {.

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

于 2010-01-05T06:46:15.333 回答