Question

在模型上使用Data Annotations时，我遇到了为客户端验证而发出的JavaScript的问题。这是一个模型的示例，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});
//]]>

只要在EmailAddress字段（正则表达式属性）上放置另一个属性，JavaScript就不再发出任何规则。请注意，在下面的JavaScript中，只有一个空数组，其中应该是规则。这是改变和脚本。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});
//]]>

当添加新属性时，是什么导致规则消失？

谢谢！

Answer 1

经过进一步调查后，问题是你的正则表达式被破坏了，因为你已经指定了两个背对背的量词：

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吞噬了属性构造函数中的异常，只是告诉你“对不起，这里没有属性。”

ASP.NET MVC 2 RC - 使用Data Annotations的客户端验证失败，具有多个属性

1 个答案: