asp.net-mvc – MVC DropDownListFor和StringLength属性不能很好地一起播放

我的stringlength验证总是在具有字符串值的下拉列表中失败.

这是我的模型：

[Required(ErrorMessage = "Required")]
[StringLength(2,MinimumLength = 2)]
[Display(Name = "Home Address State")]
public string HomeAddressState { get; set; }

这是我的观点：

@Html.DropDownListFor(model => model.HomeAddressState,new SelectList(ViewBag.States,"Value","Text"),string.Empty)
@Html.ValidationMessageFor(model => model.HomeAddressState)

这是html输出：

<select data-val="true" data-val-length="The field Home Address State must be a string with a minimum length of 2 and a maximum length of 2." data-val-length-max="2" data-val-length-min="2" data-val-required="Required" id="HomeAddressState" name="HomeAddressState"><option value=""></option>
<option value="CA">California</option>
<option value="IL">Illinois</option>
<option value="IN">Indiana</option>
<option value="OH">Ohio</option>
</select>

无论选择哪个选项,StringLength验证都会在客户端失败.我做错了什么？

解决方法

这是相关的jquery验证代码.如您所见,它似乎将长度验证应用于所选选项的数量,而不是选项的长度.似乎只适用于多选列表框.有点奇怪,说实话.

maxlength: function(value,element,param) {
    return this.optional(element) || this.getLength($.trim(value),element) <= param;
}

getLength: function(value,element) {
    switch( element.nodeName.toLowerCase() ) {
        case 'select':
            return $("option:selected",element).length;
        case 'input':
            if( this.checkable( element) )
                return this.findByName(element.name).filter(':checked').length;
    }
    return value.length;
}

你可以做的是自己覆盖getLength函数,直接返回value.length.

$.validator.prototype.getLength = function (value,element) {
    return value.length;
}