[英]Regex to substring then compare
我的mvc應用程序中包含以下代碼:
[Required(ErrorMessageResourceName = "NumberRequired", ErrorMessageResourceType = typeof (Messages))]
[RegularExpression("^[0-9]{16}$", ErrorMessageResourceName = "NumberRequired", ErrorMessageResourceType = typeof (Messages))]
public string number{ get; set; }
[Required(ErrorMessageResourceName = "LastFourRequired", ErrorMessageResourceType = typeof(Messages))]
[RegularExpression("^[0-9]{4}$", ErrorMessageResourceName = "LastFourRequired", ErrorMessageResourceType = typeof(Messages))]
public string lastfour{ get; set; }
我的問題是我需要驗證lastfour。 它必須等於數字的最后四位數。 我需要在此代碼塊中進行驗證。
有人可以幫我嗎? 提前致謝!
第一件事是,如果LastFour
與PAN
的后四位數字相同,那么為什么需要LastFour
屬性。 您可以對該部分進行子串化並獲取最后四位數字。
但是,如果您確實需要這樣做,則可以為此創建一個自定義屬性,
public class LastFourDigitsAttribute : ValidationAttribute, IClientValidatable
{
private string panPropertyname;
public LastFourDigitsAttribute(string pan)
: base()
{
if (string.IsNullOrEmpty(pan))
{
throw new ArgumentNullException("pan");
}
this.panPropertyname = pan;
}
public IEnumerable<ModelClientValidationRule> GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
{
yield return new ModelClientValidationRule
{
ErrorMessage = ErrorMessage,
// This is the name of the method added to the jQuery validator method (must be lower case)
ValidationType = "lastfour"
};
}
protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
if (value != null)
{
PropertyInfo panPropertyInfo = validationContext.ObjectInstance.GetType().GetProperty(panPropertyname);
if (panPropertyInfo != null)
{
var panPropertyValue = panPropertyInfo.GetValue(validationContext.ObjectInstance, null);
if (panPropertyValue != null)
{
if (value.ToString() != panPropertyValue.ToString().Substring(panPropertyValue.ToString().Length - 4);)
{
return new ValidationResult(ErrorMessage);
}
}
}
}
return ValidationResult.Success;
}
}
用法,
[LastFourDigits("PAN", ErrorMessageResourceName = "CustomerEnrollment_CardLastFourInvalidMessage", ErrorMessageResourceType = typeof(Messages))]
[Required(ErrorMessageResourceName = "CustomerEnrollment_CardLastFourRequiredMessage", ErrorMessageResourceType = typeof(Messages))]
[RegularExpression("^[0-9]{4}$", ErrorMessageResourceName = "CustomerEnrollment_InvalidLastFour", ErrorMessageResourceType = typeof(Messages))]
public string LastFour { get; set; }
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