我有一个asp.net MVC应用程序.有一个称为File的实体,它有一个名为Name的属性.
using System.ComponentModel.DataAnnotations;
public class File {
...
[RegularExpression(@"([^.]+[.](jpg|jpeg|gif|png|wpf|doc|docx|xls|xlsx ...,ErrorMessage = "Invali File Name"]
public string Name{ get; set; }
...
}
有一个RegularExpressionValidator检查文件扩展名.
有没有一种快速的方法,我可以告诉它忽略扩展的情况,而不必明确地添加大写变体到我的验证表达式？
我需要这个用于服务器端和客户端的RegularExpressionValidator.
“(？i)”可以用于服务器端,但这并不适用于客户端
解决方法
我可以想到的一种方法是编写自定义验证属性：
public class IgnorecaseRegularExpressionAttribute : RegularExpressionAttribute,IClientValidatable
{
public IgnorecaseRegularExpressionAttribute(string pattern): base("(?i)" + pattern)
{ }
public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata Metadata,ControllerContext context)
{
var rule = new ModelClientValidationRule
{
ValidationType = "icregex",ErrorMessage = ErrorMessage
};
// Remove the (?i) that we added in the pattern as this
// is not necessary for the client validation
rule.ValidationParameters.Add("pattern",Pattern.Substring(4));
yield return rule;
}
}
然后用它装饰你的模型：
[IgnorecaseRegularExpression(@"([^.]+[.](jpg|jpeg|gif|png|wpf|doc|docx|xls|xlsx",ErrorMessage = "Invalid File Name"]
public string Name { get; set; }
最后在客户端上写一个适配器：
<script src="@Url.Content("~/Scripts/jquery.validate.js")" type="text/javascript"></script>
<script src="@Url.Content("~/Scripts/jquery.validate.unobtrusive.js")" type="text/javascript"></script>
<script type="text/javascript">
jQuery.validator.unobtrusive.adapters.add('icregex',[ 'pattern' ],function (options) {
options.rules['icregex'] = options.params;
options.messages['icregex'] = options.message;
});
jQuery.validator.addMethod('icregex',function (value,element,params) {
var match;
if (this.optional(element)) {
return true;
}
match = new RegExp(params.pattern,'i').exec(value);
return (match && (match.index === 0) && (match[0].length === value.length));
},'');
</script>
@using (Html.BeginForm())
{
@Html.EditorFor(x => x.Name)
@Html.ValidationMessageFor(x => x.Name)
<input type="submit" value="OK" />
}
当然,您可以将客户端规则外部化为单独的JavaScript文件,以便您无需在任何地方重复.
