爱上MVC3~为下拉列表框添加一个自定义验证规则_.NET_编程开发_程序员俱乐部

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开发它的原因：

之前的同事，也是我的哥们，问我下拉列表框是否可以支持验证，这个问题看似简单，但确实ＭＶＣ里有为我们提供，所以，只能自己写个扩展了，即自己写一个attribute特性，让它继承ValidationAttribute，使它可以与其它ＭＶＣ提供的验证一起使用．

ＭＶＣ验证是怎么运行的：

在ＭＶＣ的特性验证，很方便，很直接，它无论是在数据安全性上还是在页面表现上都做的不错，它的运行机制是这样的，前台表单验证规则有个名称，然后前台ＪＳ有对这个规则编写的代码，用来控制前台ＨＴＭＬ标记的显示，而后台主要是生成验证规则和向前台参数赋值的。事实上，我们要知道的是，ＭＶＣ验证不是简单的后台验证，它还有对前台页面的控制的ＪＳ部分，它一般被继承到了jquery.validate.min.js里了，如果我们要是自己开发一套验证规则，也需要自己的ＪＳ库与相配合。

说干就干

Ｃ#部分：

　  [AttributeUsage(AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Parameter, AllowMultiple = false)]
    public sealed class NotDefaultValueAttribute : ValidationAttribute, IClientValidatable
    {
        public string InputString { get; set; }
        public NotDefaultValueAttribute()
        {
            ErrorMessage = "请选其中一项";
        }
        public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
        {
            ModelClientValidationRule rule = new ModelClientValidationRule
           {
               ValidationType = "notdefaultvalue",
               ErrorMessage = FormatErrorMessage(metadata.GetDisplayName())
           };
            rule.ValidationParameters["inputstring"] = InputString;

            yield return rule;
        }
        public override bool IsValid(object value)
        {
            if (value == null)
                return true;
            string inputString = (string)value;
            if (inputString.Contains(InputString))
            {
                return false;
            }
            return true;
        }
    }

为viewmodel添加特性

  public class TestModel
    {
        [Required]
        [Display(Name = "用户名")]
        public string UserName { get; set; }

        [Required]
        [DataType(DataType.Password)]
        [Display(Name = "密码")]
        public string Password { get; set; }

        [Display(Name = "爱好")]
        [NotDefaultValue(InputString = "1")]/*如果用户选择为１，则验证不通过*/
        public IEnumerable<SelectListItem> Liker { get; set; }
    }

在前面添加相对应的ＪＳ代码，建议将自定义的ＪＳ库放在一个单独的文件里，这样扩展性更强一些。

    $.validator.addMethod('notdefaultvalue', function (value, element, param) {
        if (value == false) {
            return true;
        }
        if (value.indexOf(param) != -1) {
            return false;
        }
        else {
            return true;
        }
    });
    $.validator.unobtrusive.adapters.addSingleVal('notdefaultvalue', 'inputstring');

ＯＫ，现在就可以运行我们的程序了，看看效果吧

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" alt="" />

怎么样，像这种扩展，我们还可以写很多，举一反三吧，呵呵！

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