抛出本地化的ValidationException

时间:2012-05-25 19:56:03

标签: c# validation

我正在创建一个自定义属性验证,它应该在抛出ValidationException时使用指定资源文件中的错误字符串。我是否正确地假设如果我抛出异常并且未在参数中指定错误字符串,它应该使用我在构造函数中指定的ErrorMessageResourceName和ErrorMessageResourceType?

using System;
using System.ComponentModel.DataAnnotations;
using System.Text.RegularExpressions;

namespace OurProduct.Util
{
    [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property, AllowMultiple = false, Inherited = true)]
    public class UniquenessAttribute : ValidationAttribute
    {
        public UniquenessAttribute()
        {
            ErrorMessageResourceName = "EmailUniqueError";
            ErrorMessageResourceType = typeof (Resources.OurThing);
        }

        protected override ValidationResult IsValid(object value)
        {
            throw new ValidationException();
        }
    }
}

1 个答案:

答案 0 :(得分:2)

如果OurThing指向生成的强类型资源类,查找本地化字符串等,以下"EmailUniqueError"是此类的静态属性之一,则以下内容应该有效:

    public class UniquenessAttribute : ValidationAttribute
    {
        public UniquenessAttribute()
        {
            ErrorMessageResourceName = "EmailUniqueError";
            ErrorMessageResourceType = typeof (Resources.OurThing);
        }

        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            if (failure) // to implement
                return new ValidationResult(FormatErrorMessage(validationContext.DisplayName));
            ...
        }
    }

还要确保在进行测试时验证所有属性(例如,如果使用TryValidateObject,请确保将最后一个参数设置为true)。