asp.net-mvc-3 – MVC模型范围验证器?
发布时间:2020-12-15 23:56:59 所属栏目:asp.Net 来源:网络整理
导读:我想验证日期时间,我的代码是: [Range(typeof(DateTime),DateTime.Now.AddYears(-65).ToShortDateString(),DateTime.Now.AddYears(-18).ToShortDateString(),ErrorMessage = "Value for {0} must be between {1} and {2}")] public DateTime Birthday { get
我想验证日期时间,我的代码是:
[Range(typeof(DateTime),DateTime.Now.AddYears(-65).ToShortDateString(),DateTime.Now.AddYears(-18).ToShortDateString(),ErrorMessage = "Value for {0} must be between {1} and {2}")] public DateTime Birthday { get; set; } 但我得到错误: An attribute argument must be a constant expression,typeof expression or array creation expression of an attribute parameter type 请帮帮我? 解决方法
这意味着Range属性的值不能在以后确定,必须在编译时确定. DateTime.Now不是常量,它根据代码运行的时间而变化.
你想要的是一个自定义DataAnnotation验证器.以下是如何构建一个示例: How to create Custom Data Annotation Validators 将您的日期验证逻辑放在IsValid()中 这是一个实现.我也使用DateTime.Subtract()而不是负数年. public class DateRangeAttribute : ValidationAttribute { public int FirstDateYears { get; set; } public int SecondDateYears { get; set; } public DateRangeAttribute() { FirstDateYears = 65; SecondDateYears = 18; } public override bool IsValid(object value) { DateTime date = DateTime.Parse(value); // assuming it's in a parsable string format if (date >= DateTime.Now.AddYears(-FirstDateYears)) && date <= DateTime.Now.AddYears(-SecondDateYears))) { return true; } return false; } } 用法是: [DateRange(ErrorMessage = "Must be between 18 and 65 years ago")] public DateTime Birthday { get; set; } 它也是通用的,因此您可以指定多年的新范围值. [DateRange(FirstDateYears = 20,SecondDateYears = 10,ErrorMessage = "Must be between 10 and 20 years ago")] public DateTime Birthday { get; set; } (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |
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