ASP.NET MVC 5: EmailAddress attribute custom error message

问题

In register form I use EmailAddress attribute to validate user email.

public class RegisterViewModel
{
    [Required(ErrorMessage = "Pole wymagane")]
    [Display(Name = "Email")]
    [DataType(DataType.EmailAddress)]
    [EmailAddress]
    public string Email { get; set; }
}

Is there any chance to show what is wrong with email address if validation fails? For example 'oops, I see that your email address contains whitespace'

回答1:

You have to add another validation for that. Example using [RegularExpression]

public class RegisterViewModel
{
    [Required(ErrorMessage = "Pole wymagane")]
    [RegularExpression(@"^\S*$", ErrorMessage = "Email Address cannot have white spaces")]
    [Display(Name = "Email")]
    [DataType(DataType.EmailAddress)]
    [EmailAddress]
    public string Email { get; set; }
}

来源：https://stackoverflow.com/questions/41890299/asp-net-mvc-5-emailaddress-attribute-custom-error-message