c# - 自定义错误消息不出现数据注释

Question

我有一个应用了代码优先数据注释的类，但在 MVC View 中，我发现出现默认错误消息而不是自定义错误消息。请提出任何建议

public class PaymentModel
    {
        [DisplayName("Email Address")]
        [Required]
        [RegularExpression(@"^[-a-z0-9~!$%^&*_=+}{\'?]+(\.[-a-z0-9~!$%^&*_=+}{\'?]+)*@([a-z0-9_][-a-z0-9_]*(\.[-a-z0-9_]+)*\.(aero|arpa|biz|com|coop|edu|gov|info|int|mil|museum|name|net|org|pro|travel|mobi|[a-z][a-z])|([0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}))(:[0-9]{1,5})?$", ErrorMessage = "Please enter a valid Email Address")]
        public string EmailAddress { get; set; }

        [DisplayName("Credit Card Number")]
        [Required]
        [StringLength(16, ErrorMessage = "The {0} must be at least {1} characters long.", MinimumLength = 3)]
        public int CreditCardNumber { get; set; }

        [Required]
        [StringLength(3, ErrorMessage = "The {0} must be at least {1} characters long.", MinimumLength = 3)]
        public int Cvv { get; set; }

        [DisplayName("Expiry Month")]
        [Required]
        public int ExpiryMonth { get; set; }

        [DisplayName("Expiry Year")]
        [Required]
        public int ExpiryYear { get; set; }
    }

Answer 1

你需要明确指定一个ErrorMessage

[Required(ErrorMessage = "Email address is required")]
public string EmailAddress { get; set; }