如何使用动态模式创建regularExpressionAttribute来自model属性
public class City { [DynamicReqularExpressionAttribute(PatternProperty = "RegEx")] public string Zip {get; set;} public string RegEx { get; set;} } 我想创建这个属性，其中模式来自其他属性，而不像原始的RegularExpressionAttribute那样声明静态。
任何想法将不胜感激 – 谢谢
线条之间的某些东西应符合要求：
public class DynamicRegularExpressionAttribute : ValidationAttribute { public string PatternProperty { get; set; } protected override ValidationResult IsValid(object value, ValidationContext validationContext) { PropertyInfo property = validationContext.ObjectType.GetProperty(PatternProperty); if (property == null) { return new ValidationResult(string.Format("{0} is unknown property", PatternProperty)); } var pattern = property.GetValue(validationContext.ObjectInstance, null) as string; if (string.IsNullOrEmpty(pattern)) { return new ValidationResult(string.Format("{0} must be a valid string regex", PatternProperty)); } var str = value as string; if (string.IsNullOrEmpty(str)) { // We consider that an empty string is valid for this property // Decorate with [Required] if this is not the case return null; } var match = Regex.Match(str, pattern); if (!match.Success) { return new ValidationResult(this.FormatErrorMessage(validationContext.DisplayName)); } return null; } }
然后：
模型：
public class City { [DynamicRegularExpression(PatternProperty = "RegEx")] public string Zip { get; set; } public string RegEx { get; set; } }
控制器：
public class HomeController : Controller { public ActionResult Index() { var city = new City { RegEx = "[0-9]{5}" }; return View(city); } [HttpPost] public ActionResult Index(City city) { return View(city); } }
视图：
@model City @using (Html.BeginForm()) { @Html.HiddenFor(x => x.RegEx) @Html.LabelFor(x => x.Zip) @Html.EditorFor(x => x.Zip) @Html.ValidationMessageFor(x => x.Zip) }
覆盖将ValidationContext作为参数的Validate方法，使用ValidationContext从相关属性中获取正则表达式字符串并应用正则表达式，返回匹配的值。