用于验证电子邮件地址的C＃代码 [英] C# code to validate email address

问题描述

解决方案

这是什么？ / p>

  bool IsValidEmail（string email）
 {
 try {
 var addr = new System。 Net.Mail.MailAddress（电子邮件）; 
 return addr.Address == email; 
} 
 catch {
 return false; 
} 
} 
  

要澄清一点，问题是询问一个特定的字符串是电子邮件地址的有效表示，而不是电子邮件地址是否是发送邮件的有效目的地。为此，唯一真实的方法是发送一条消息以确认。

请注意，电子邮件地址比您先前假定的更为宽容。这些都是完全有效的形式：

• cog @ wheel


• cogwheel the orange@example .com


• 123 @ $。xyz

对于大多数用例，假的无效对于您的用户来说，要比假的有效更糟糕。这是一个以前是这个问题的接受答案的文章（该答案已被删除）。它有更多的细节和一些其他的想法如何解决问题。

提供健全检查仍然是一个好主意用户体验。假设电子邮件通过验证，您可以通过另一个可以查找已知顶级域的验证器，检查域的MX记录，检查通用域名（gmail.cmo）等的拼写错误然后发出警告，让用户有机会说是的，我的邮件服务器真的允许

What is the most elegant code to validate that a string is a valid email address?

解决方案

What about this?

bool IsValidEmail(string email)
{
    try {
        var addr = new System.Net.Mail.MailAddress(email);
        return addr.Address == email;
    }
    catch {
        return false;
    }
}

To clarify, the question is asking whether a particular string is a valid representation of an e-mail address, not whether an e-mail address is a valid destination to send a message. For that, the only real way is to send a message to confirm.

Note that e-mail addresses are more forgiving than you might first assume. These are all perfectly valid forms:

• cog@wheel
• "cogwheel the orange"@example.com
• 123@$.xyz

For most use cases, a false "invalid" is much worse for your users and future proofing than a false "valid". Here's an article that used to be the accepted answer to this question (that answer has since been deleted). It has a lot more detail and some other ideas of how to solve the problem.

Providing sanity checks is still a good idea for user experience. Assuming the e-mail passes validation, you can then pass it through another validator that could look for a known top-level domain, check the domain for an MX record, check for spelling errors from common domain names (gmail.cmo), etc. Then present a warning giving the user a chance to say "yes, my mail server really does allow

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