爱上MVC3~为下拉列表框添加一个自定义验证规则

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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 = "")]/*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) != -) {
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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QgDkUD4lA0IA5FA+JQNCAORQPiUDQgDkUD4lA0IA5FA+JQNCAORQPiUDQgjv8DvdLYNhuI/fcAAAAASUVORK5CYII=" 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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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