我有一个asp.net MVC应用程序。有一个名为File的实体,它具有名为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可以让我忽略扩展名,而不必在验证表达式中显式添加大写变体?
我需要在服务器端和客户端都使用这个RegularExpressionValidator。
“(?i)”可用于服务器端,但这不适用于客户端
最佳答案
我能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;
}
}
然后用它来装饰模型:
[IgnorecaseRegularExpression(@"([^.]+[.](jpg|jpeg|gif|png|wpf|doc|docx|xls|xlsx", ErrorMessage = "Invalid File Name"]
public string Name { get; set; }
最后在客户端上编写一个适配器:
<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一个单独的javascript文件,这样您就不必在任何地方重复它。