像一个优秀的c#用户一样,我使用MailAddress
对象来验证电子邮件地址。
我的一个客户在邮件中输入john@gmail.
,通过MailAddress
验证,导致我的软件崩溃。我希望下面的代码抛出一个异常,但它没有。
static void Main(string[] args)
{
string addressmail = string.Empty;
try
{
MailAddress mail = new MailAddress(@"john@gmail.");
addressmail = mail.Address;
}
catch (FormatException)
{
// address is invalid
}
// address is valid
Console.WriteLine(addressmail);
}
你知道如何捕捉这种虚假的邮件地址吗?
我认为在这种情况下,MS的有效电子邮件地址的实现是不正确的,至少按照RFC822。我还没有真正尝试过你的代码,所以我假设它像你说的那样。
还有其他验证电子邮件地址的方法,例如实际连接到SMTP服务器并要求它确认地址是有效的(如这里和这里所述)。如果不这样做,你总会遇到一些麻烦。就我个人而言,我认为不值得花太多时间根据某些规范来验证电子邮件地址(除了我们可以处理的快速检查;例如,你的代码)——真正的测试是,如果你发送了一封电子邮件,是否在那个地址上收到了。一个简单的电子邮件验证可以确认这一点,虽然我知道它可能不适合在所有情况下,但在那些情况下,你就不走运了。
MailAddress类型对验证电子邮件地址的支持非常有限,并且,从。net 4.0开始,不支持大多数相关的IETF标准。如果您需要验证电子邮件地址的语法,可能不使用正则表达式,我建议您查看EmailVerify。.NET ,一个。NET组件,支持所有关于该主题的当前标准 (RFC 1123、RFC 2821、RFC 2822、RFC 3696、RFC 4291、RFC 5321和RFC 5322)。如果需要,该组件甚至允许对地址执行其他测试,包括DNS、SMTP和邮箱检查。
- EmailVerify。. NET网站:http://cobisi.com/email-validation/.net-component
- 在线演示:http://cobisi.com/email-validation/validate-address
免责声明:我是这个产品的主要开发人员。
某种固定的版本,混合MailAddress和一个简单的Regex来验证主机:
静态正则表达式,由SLaks
建议private static readonly Regex hostReg = new Regex(@"(w+).(w+)");
public bool IsMailAddress(string addParam)
{
try
{
MailAddress mail = new MailAddress(addParam);
string address = mail.Address;
//not handled by MailAdress, which is a shame
return hostReg.IsMatch(mail.Host);
}
catch (FormatException)
{
//address is invalid
return false;
}
catch (Exception)
{
return false;
}
}
MailAddress试图与RFC2822兼容,这使RFC822过时。当您阅读MailAddress的源代码时,您会看到接受结束点只是为了与某些电子邮件客户端兼容。用正则表达式验证电子邮件地址是不正确的(见RFC2822),最好的方法是实现一个解析器,就像MailAddress所做的那样。
参见MailAddressParser使用的DotAtomReader
不是一个免费的解决方案,但Cobisi的电子邮件验证库可以在不同的精度级别(语法,IspSpecificSyntax, deaddomain, Dns, deamailexchange, Smtp, Mailbox, CatchAll)内判断电子邮件是否有效
var engine = new VerificationEngine();
var result = engine.Run("john@example.com",
VerificationLevel.Mailbox).Result;
if (result.LastStatus == VerificationStatus.Success)
{
// TODO: Show a message box with the great news
}
免责声明:本人与公司或项目无关
MailboxValidator有一个免费的API可以使用。只需要在http://www.mailboxvalidator.com/plans#api注册免费的API计划,然后集成部分非常容易,因为他们也有一个c#类http://www.mailboxvalidator.com/dotnet让你包装API调用。
c#类代码在https://github.com/MailboxValidator/mailboxvalidator-csharp 中要通过NuGet (https://www.nuget.org/packages/MailboxValidator.SingleValidation/)安装MailboxValidator SingleValidation类,请在Package Manager Console中运行以下命令:
Install-Package MailboxValidator.SingleValidation
然后你可以像下面这样使用这个类:
using System;
using System.Windows.Forms;
using MailboxValidator;
namespace TestMailboxValidatorCSharp
{
public class TestMailboxValidatorCSharp
{
static void Main(string[] args)
{
var mbv = new SingleValidation("PASTE_YOUR_API_KEY_HERE");
String results = "";
try
{
MBVResult rec = mbv.ValidateEmail("example@example.com");
if (rec.ErrorCode == "")
{
results += "email_address: " + rec.EmailAddress + "n";
results += "domain: " + rec.Domain + "n";
results += "is_free: " + rec.IsFree + "n";
results += "is_syntax: " + rec.IsSyntax + "n";
results += "is_domain: " + rec.IsDomain + "n";
results += "is_smtp: " + rec.IsSMTP + "n";
results += "is_verified: " + rec.IsVerified + "n";
results += "is_server_down: " + rec.IsServerDown + "n";
results += "is_greylisted: " + rec.IsGreylisted + "n";
results += "is_disposable: " + rec.IsDisposable + "n";
results += "is_suppressed: " + rec.IsSuppressed + "n";
results += "is_role: " + rec.IsRole + "n";
results += "is_high_risk: " + rec.IsHighRisk + "n";
results += "is_catchall: " + rec.IsCatchall + "n";
results += "mailboxvalidator_score: " + rec.MailboxValidatorScore + "n";
results += "time_taken: " + rec.TimeTaken + "n";
results += "status: " + rec.Status + "n";
results += "credits_available: " + rec.CreditsAvailable + "n";
}
else
{
results += "error_code: " + rec.ErrorCode + "n";
results += "error_message: " + rec.ErrorMessage + "n";
}
results += "version: " + rec.Version + "n";
MessageBox.Show(results);
}
catch (Exception ex)
{
MessageBox.Show(ex.Message + "n" + ex.StackTrace);
}
}
}
}