c# - 如何使用新错误消息创建自定义最大长度和必需验证，逻辑保持不变

Question

[MaxLength(45, ErrorMessage = Translations.Attribute.MAX_LENGTH)]
[Required(ErrorMessage = Translations.Attribute.REQUIRED)]

如何使用默认翻译消息创建自定义 Required 和 MaxLength 验证。我可以简单地覆盖它并只更改 errorMessage 吗？

我只想写

[MyMaxLength(45)]
[MyRequired]

所需的解决方案:

public class MyRequiredAttribute : RequiredAttribute
    {
        public override string FormatErrorMessage(string name)
        {
            return string.Format("Polje {0} je obvezno", name);
        }
    }

Answer 1

您应该能够从 MaxLengthAttribute 或您正在使用的任何其他属性派生...

public class MyMaxLengthAttribute : MaxLengthAttribute
{
    public MyMaxLengthAttribute(int length) : base(length)
    {
        ErrorMessage = Translations.Attribute.MAX_LENGTH;
    }

    // other ctors/members as needed
}