Question

我正在处理ApplicationUser的表单注册。在那里，我有像Facebook一样的Email or phone字段。我正在使用DataAnnotation进行模型验证。在Data annotation我获得了[EmailAddress]用于电子邮件验证，[Phone]用于电话号码验证。但我需要像[EmailAddressOrPhone]这样的东西。 那我怎么能实现呢？

public class RegisterViewModel
{
    .....

    [Required]
    [Display(Name = "Email or Phone")]
    public string EmailOrPhone { get; set; }

    ......
}

Answer 1

您shouldn't use your own regex to validate email addresses，但我个人会使用以下逻辑来确定它是否是有效的电子邮件地址。如果它不是有效的电子邮件地址，您可以认为它是电话号码。

以下代码使用您已提及但在代码中的[EmailAddress]属性。这样您就不必发明自己的验证电子邮件地址的方法。

public EmailOrPhoneAttribute : ValidationAttribute
{
    public override IsValid(object value)
    {
        var emailOrPhone = value as string;

        // Is this a valid email address?
        if (this.IsValidEmailAddress(emailOrPhone))
        {
           // Is valid email address
           return true;
        }
        else if (this.IsValidPhoneNumber(emailOrPhone))
        {
            // Assume phone number
            return true;
        }

        // Not valid email address or phone
        return false;
    }

    private bool IsValidEmailAddress(string emailToValidate)
    {
        // Get instance of MVC email validation attribute
        var emailAttribute = new EmailAddressAttribute();

        return emailAttribute.IsValid(emailOrPhone);
    }

    private bool IsValidPhoneNumber(string phoneNumberToValidate)
    {
        // Regualr expression from https://stackoverflow.com/a/8909045/894792 for phone numbers
        var regex = new Regex("^\+?(\d[\d-. ]+)?(\([\d-. ]+\))?[\d-. ]+\d$");
        return regex.IsMatch(phoneNumberToValidate)
    }
}

当然，您需要确定自己如何确定电话号码是否正确，因为不同国家/地区的电话号码不同。我刚刚以this question的正则表达式为例。

Answer 2

您可以使用Regex来实现此目的。您必须合并电子邮件和电话的正则表达式。

public class RegisterViewModel
{
    [Required]
    [Display(Name = "Email or Phone")]
    /* /<email-pattern>|<phone-pattern>/ */
    [RegularExpression(@"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$|^\+?\d{0,2}\-?\d{4,5}\-?\d{5,6}", ErrorMessage = "Please enter a valid email address or phone number")]      
    public string EmailOrPhone { get; set; }
}

或者您可以创建自定义属性

 public class EmailOrPhoneAttribute : RegularExpressionAttribute
 {
    public EmailOrPhoneAttribute()
        : base(@"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$|^\+?\d{0,2}\-?\d{4,5}\-?\d{5,6}")
    {
        ErrorMessage = "Please provide a valid email address or phone number";
    }
 }

并使用

 public class RegisterViewModel
 {
    [Required]
    [Display(Name = "Email or Phone")]
    [EmailOrPhone]    
    public string EmailOrPhone { get; set; }
 }

Answer 3

除自定义属性外，您还可以查看此库： https://github.com/jwaliszko/ExpressiveAnnotations

一个例子是：

[Required]
[AssertThat("IsEmail(EmailOrPhone) || (Length(EmailOrPhone) > 8 && Length(EmailOrPhone) < 16 && IsRegexMatch(EmailOrPhone, '^\\d+$'))",
    ErrorMessageResourceType = typeof (Resources), ErrorMessageResourceName = nameof(Resources.EmailFormatInvalid))]
[Display(Name = "EmailOrPhone")]
public string EmailOrPhone { get; set; }

我在ExpressiveAnnotations中使用了AssertThat属性，并在Resources文件中创建了错误消息EmailFormatInvalid。

用于电子邮件或电话的ASP.NET MVC数据注释验证器

3 个答案: