Question

I have a Variable and I want to allow only certain values in it.

[Required(ErrorMessage = "Category must be provided")]
[Range(2, 4)]
public int Category { get; set; }

我想允许在这一变量中增加一些价值,即6和10。我应该怎样做? 如果我能具体阐明我允许的具体价值观,是否有属性?

Answer 1

Option 1

1. 提交手稿或上手递/下手递的钥匙

Option 2

Use RegularExpression data annotation like this

[RegularExpression(<>[>2>]”, ErrorMessage = “Enter 2 or 6 only” ]

<><>ption 3

Use custom validators

Answer 2

你们可以产生一种习俗验证归属。例如:

using System;
using System.Collections.Generic;
using System.Web;
using System.ComponentModel.DataAnnotations;    

namespace MyProject.Models.Validation
{

    public class SpecialCategoryAttribute : ValidationAttribute
    {
        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {

            if(value == 6 || value == 10)
            {
                return ValidationResult.Success;
            }


            return new ValidationResult("Fail");
        }
    }
}

但是,在属性之间似乎存在着冲突:Range。允许2->4和SpecialCategory 只允许6和10。因此,你的模式始终有效。

I think you can remove your Range and use only SpecialCategory with the values 2->4 and 6 and 10 alowed.

Answer 3

[RegularExpression("[2|4|6|10]")]
public int Category { get; set; }

Answer 4

[RegularExpression("^(2|4|6|10)$")]

公共类别{已;第3条

Answer 5

Starting from .NET 8.0 you can use AllowedValues and DeniedValues attributes.

例如:[AllowedValues(2,3,4)]。

。阅读更多关于<条码>的

。阅读更多<代码>DeniedValues

友情链接