[英]Why does MailAddress not reject the email address someName@gmail?
[英]Why does MailAddress think 'john@gmail.' is a valid email address?
像一個優秀的 C# 用戶一樣,我使用MailAddress
對象來驗證電子郵件地址。
我的一個客戶輸入了john@gmail.
他的電子郵件,經過MailAddress
驗證,破壞了我的軟件。 我希望下面的代碼拋出異常,但事實並非如此。
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);
}
你知道如何捕捉這種虛假的郵件地址嗎?
MailAddress 類型對驗證電子郵件地址的支持非常有限,並且從 .NET 4.0 開始,不支持大多數相關的 IETF 標准。 如果您需要驗證電子郵件地址的語法,可能不使用正則表達式,我建議您查看EmailVerify.NET ,這是一個支持有關該主題的所有當前標准的 .NET 組件(RFC 1123、RFC 2821 、RFC 2822、RFC 3696、RFC 4291、RFC 5321 和 RFC 5322)。 如果需要,該組件甚至允許對地址執行其他測試,包括 DNS、SMTP 和郵箱檢查。
免責聲明:我是該產品的首席開發人員。
MailboxValidator 有一個您可以使用的免費 API。 只需要在http://www.mailboxvalidator.com/plans#api上注冊免費的 API 計划,那么集成部分就很容易了,因為他們還有一個 C# 類http://www.mailboxvalidator.com/dotnet你來包裝 API 調用。
C# 類代碼位於https://github.com/MailboxValidator/mailboxvalidator-csharp
要通過 NuGet ( https://www.nuget.org/packages/MailboxValidator.SingleValidation/ ) 安裝 MailboxValidator SingleValidation 類, 請在包管理器控制台中運行以下命令:
Install-Package MailboxValidator.SingleValidation
然后你可以像下面這樣使用這個類:
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);
}
}
}
}
以某種方式固定版本,混合 MailAddress 和一個簡單的 Regex 來驗證主機:
SLaks 建議的靜態正則表達式
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 嘗試與廢棄 RFC822 的 RFC2822 兼容。 當您閱讀 MailAddress 的源代碼時,您會看到接受它的結尾點只是為了與某些電子郵件客戶端兼容。 使用正則表達式驗證電子郵件地址不是正確的做法(參見 RFC2822),最好的方法是實現解析器,MailAddress 所做的。
不是免費的解決方案,但Cobisi 的電子郵件驗證庫可以在不同的准確度(語法、IspSpecificSyntax、DeaDomain、Dns、DeaMailExchanger、Smtp、Mailbox、CatchAll)內判斷電子郵件是否有效
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
}
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