asp.net-mvc – 如何在RegularExpression中忽略大小写？

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.