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1.  自定义PriceAttribute

using System;

using System.Collections.Generic; using System.Linq; using System.Web; using System.ComponentModel.DataAnnotations; using System.Web.Mvc;

namespace MvcApp.Web.Classes

{     public sealed class PriceAttribute : ValidationAttribute, IClientValidatable     {         public double MinPrice { get; set; }         public double MaxPrice { get; set; }

        public override bool IsValid(object value)

        {             if (value == null)             {                 return true;             }             var price = (double) value;             if (price < MinPrice || price > MaxPrice)             {                 return false;             }             double cents = price - Math.Floor(price);             if (cents < 0.99 || cents >= 0.995)             {                 return false;             }

            return true;

        }

        public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)

        {             var rule = new ModelClientValidationRule             {                 ErrorMessage = this.ErrorMessage,                 ValidationType = "price"             };             rule.ValidationParameters.Add("min", this.MinPrice);             rule.ValidationParameters.Add("max", this.MaxPrice);

            yield return rule;

        }

    }

}

2. 应用到实体

        [Price(MinPrice = 3.99, MaxPrice = 9.99, ErrorMessage = "Price must end in .99 and be larger than 3.99 and less than 9.99")]

        public double Price { get; set; }

 

3. 客户端定义注册

<script src="<%: Url.Content("~/Scripts/jquery.validate.min.js") %>" type="text/javascript"></script>

<script src="<%: Url.Content("~/Scripts/jquery.validate.unobtrusive.min.js") %>" type="text/javascript"></script> <script type="text/javascript">     $(function () {         $.validator.addMethod("priceMethod", function (value, element, params) {             if (this.optional(element)) {                 return true;             }

            //alert(value);

            //alert(params);             //alert(params[0]);

            var minValue = parseFloat(params[0]);

            var maxValue = parseFloat(params[1]);                         if (value > minValue && value < maxValue) {                 var cents = value - Math.floor(value);                 if (cents >= 0.99 && cents < 0.995) {                     return true;                 }             }

            return false;

        });     });

    //$.validator.unobtrusive.adapters.addSingleVal("price", "min");

第一个参数是适配器的名称，必须与服务器端设置规则的ValidationProperty的值相同。第二个参数是用来检索元数据的参数名称。请注意，不需要在参数名中使用data-前缀；这里的参数需要与你在服务器端设置的ValidationParameters集合中的参数名相匹配。

    $.validator.unobtrusive.adapters.addMinMax("price", "min", "max", "priceMethod");

    </script>

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