我有一个SharedResource文件，其属性已翻译成4种语言。如果iban输入无效，我想返回本地化的ErrorMessage。
本地化适用于RequiredAttribute（从ValidationAttribute派生），但不适用于Ibanvalidator。
我在这里做错了什么？
模型
[LocalizedDisplayName("RegisterFinancialStepViewModel_Iban_DisplayName", typeof(SharedResource))]
[IbanValidation("ErrorMessage_Invalid_Iban")]
[StringLength(50)]
public string Iban { get; set; }
这也行不通
[IbanValidation(ErrorMessage = "ErrorMessage_Invalid_Iban")]
IbanValidator类
public static class IbanValidator
{
public static bool Validate(string iban)
{
return string.IsNullOrEmpty(iban) || ValidateChecksum(iban.ToUpper());
}
private static bool ValidateChecksum(string iban)
{
if (iban.Length < 4 || iban[0] == ' ' || iban[1] == ' ' || iban[2] == ' ' || iban[3] == ' ')
return false;
var checksum = 0;
var ibanLength = iban.Length;
for (var charIndex = 0; charIndex < ibanLength; charIndex++)
{
if (iban[charIndex] == ' ') continue;
int value;
var c = iban[(charIndex + 4) % ibanLength];
if (c >= '0' && c <= '9')
{
value = c - '0';
}
else if (c >= 'A' && c <= 'Z')
{
value = c - 'A';
checksum = (checksum * 10 + value / 10 + 1) % 97;
value %= 10;
}
else if (c >= 'a' && c <= 'z')
{
value = c - 'a';
checksum = (checksum * 10 + value / 10 + 1) % 97;
value %= 10;
}
else
{
return false;
}
checksum = (checksum * 10 + value) % 97;
}
return checksum == 1;
}
}
public class IbanValidationAttribute : ValidationAttribute
{
private readonly string _errorMessage;
public IbanValidationAttribute(string errorMessage)
{
_errorMessage = errorMessage;
}
protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
return IbanValidator.Validate(value as string)
? ValidationResult.Success
: new ValidationResult(_errorMessage);
}
}
用Required替换IbanValidator会给出本地化但没有验证
[Required(ErrorMessage = "ErrorMessage_Invalid_Iban")]
您可以ErrorMessageTranslationService手动创建一个本地化错误消息。
public class ErrorMessageTranslationService
{
private readonly IStringLocalizer<SharedResource> _sharedLocalizer;
public ErrorMessageTranslationService(IStringLocalizer<SharedResource> sharedLocalizer)
{
_sharedLocalizer = sharedLocalizer;
}
public string GetLocalizedError(string errorKey)
{
return _sharedLocalizer[errorKey];
}
}
并在启动时注册它ConfigureServices：
services.AddSingleton<ErrorMessageTranslationService>();
然后以自定义方式致电服务 IbanValidationAttribute
public class IbanValidationAttribute : ValidationAttribute
{
private readonly string _errorMessage;
public IbanValidationAttribute(string errorMessage)
{
_errorMessage = errorMessage;
}
protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
ErrorMessageTranslationService errorTranslation = validationContext.GetService(typeof(ErrorMessageTranslationService)) as ErrorMessageTranslationService;
return IbanValidator.Validate(value as string)
? ValidationResult.Success
: new ValidationResult(errorTranslation.GetLocalizedError(_errorMessage));
}
}
模型：
[IbanValidation("ErrorMessage_Invalid_Iban")]
[StringLength(50)]
public string Iban { get; set; }
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