如何使用 DataAnnotations & Regex - c# - ASP.NET Core

Posted 2023-04-13

【中文标题】如何使用 DataAnnotations & Regex - c# - ASP.NET Core

【英文标题】：How to use DataAnnotations & Regex - c# - ASP.NET Core

【发布时间】：2021-03-17 16:11:58

【问题描述】：

我正在使用数据注释来匹配用户为错误处理目的而输入的字段。

每当他们输入不正确的格式时，它就会打印实际的正则表达式，我想知道是否有办法删除“匹配以下正则表达式”并只打印错误消息。

我的表单示例和显示的错误消息： Form

我的代码：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using System.ComponentModel.DataAnnotations;

namespace FoodCart.Models

    public class Order
    
        public int ID  get; set; 

        [Display(Name = "First Name")]
        [RegularExpression(@"^[a-zA-Z''-'\s]1,40$")]
        [Required(ErrorMessage = "This field is required")]
        public string FirstName  get; set; 

        [Display(Name = "Last Name")]
        [RegularExpression(@"^[a-zA-Z''-'\s]1,40$")]
        [Required(ErrorMessage = "This field is required")]
        public string LastName  get; set; 

        [Required(ErrorMessage = "This field is required")]
        public string Address  get; set; 

        [Required(ErrorMessage = "This field is required")]
        public string City  get; set; 

        [Required(ErrorMessage = "This field is required")]
        public string State  get; set; 

        [Required(ErrorMessage = "This field is required")]
        public string Zip  get; set; 

        [Display(Name = "Name on Card")]
        [Required(ErrorMessage = "This field is required")]
        public string NameonCard  get; set; 

        [Display(Name = "Credit Card Number")]
        [Required(ErrorMessage = "This field is required, input valid 16 digit number")]
        [RegularExpression(@" ([0 - 9][0 - 9][0 - 9][0 - 9]) ([0 - 9][0 - 9][0 - 9][0 - 9]) ([0 - 9][0 - 9][0 - 9][0 - 9]) ([0 - 9][0 - 9][0 - 9][0 - 9])")]
        public string CreditCardNum  get; set; 

        [Display(Name = "Expiration Date")]
        [Required(ErrorMessage = "This field is required, input valid expiration date: MM/YY")]
        [RegularExpression(@"([0-9][0-9])\/([0-9][0-9])")]
        public string ExpDate get; set; 

        [Display(Name = "CVV")]
        [RegularExpression(@"([0-9][0-9][0-9])")]
        [Required(ErrorMessage = "This field is required")]
        public string cvv  get; set; 

        [Display(Name = "Total")]
        public decimal YourTotal  get; set; 
        public int UserLinkID  get; set; 


    

【问题讨论】：

您选择的模式不合适。你想用这个模式做什么？

【参考方案1】：

验证属性都带有内置在实现中的默认错误消息。对于RegularExpressionAttribute，此错误消息如下：

字段 0 必须匹配正则表达式“1”。

占位符 0 将是正在验证的属性的显示名称，1 将是正则表达式本身。

有几种方法可以自定义此错误消息，使用properties on the validation attribute 之一。最简单的方法是直接使用 ErrorMessage 属性指定错误消息。请注意，如果您愿意，您仍然可以参考占位符 0（用于字段名称）和 1（用于正则表达式）：

[Display(Name = "First Name")]
[RegularExpression(@"^[a-zA-Z'-\s]1,40$", ErrorMessage = "The field 0 is not a valid name")]
public string FirstName  get; set; 

【参考方案2】：

[RegularExpression(@"([0-9][0-9])\/([0-9][0-9])",ErrorMessage = "your message")]