电子邮件地址输入验证

Question

有没有办法在wpf C#中为电子邮件地址进行文本框输入验证？正则表达式或验证表达式或任何可以提供帮助的内容,最好使用代码示例和一些说明

Answer 1

在text_changed事件上,您可以将文本框的值传递给帮助程序类.

public static class ValidatorExtensions
{
    public static bool IsValidEmailAddress(this string s)
    {
        Regex regex = new Regex(@"^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$");
        return regex.IsMatch(s);
    }
}

现在,在文本更改事件上,您可以测试输入

private void myTextBox_TextChanged(object sender, EventArgs e)
{
   bool result = ValidatorExtensions.IsValidEmailAddress( myTextBox.Text );
}

Answer 2

有几种方法可以检查电子邮件地址是否有效

关于 System.Net.Mail.MailAddress
关于 Regex表达式

 static void Main(string[] args)
        {
            var validMail = "validMail@gmail.com";
            var invalidMail = "123";
            Console.WriteLine("IsValidMailAddress1 Test");
            Console.WriteLine(string.Format("Mail Address : {0} . is valid : {1}", validMail, IsValidMailAddress1(validMail)));
            Console.WriteLine(string.Format("Mail Address : {0} . is valid : {1}", invalidMail, IsValidMailAddress1(invalidMail)));

            Console.WriteLine("IsValidMailAddress2 Test");
            Console.WriteLine(string.Format("Mail Address : {0} . is valid : {1}", validMail, IsValidMailAddress2(validMail)));
            Console.WriteLine(string.Format("Mail Address : {0} . is valid : {1}", invalidMail, IsValidMailAddress2(invalidMail)));

        }


        static bool IsValidMailAddress1(string mail)
        {
            try
            {
                System.Net.Mail.MailAddress mailAddress = new System.Net.Mail.MailAddress(mail);

                return true;
            }
            catch
            {
                return false;
            }
        }

        static bool IsValidMailAddress2(string mailAddress)
        {
            return Regex.IsMatch(mailAddress, @"^([\w\.\-]+)@([\w\-]+)((\.(\w){2,3})+)$");
        }