How Can I Robustly Validate Email Addresses in C#?

Email Address Validation in C#: An In-depth Analysis

When dealing with email addresses, it is crucial to verify their validity to ensure smooth communication. This code snippet provides a powerful email address verification solution:

bool IsValidEmail(string email)
{
    var trimmedEmail = email.Trim();

    if (trimmedEmail.EndsWith(".")) {
        return false; // @TK-421 建议
    }
    try {
        var addr = new System.Net.Mail.MailAddress(email);
        return addr.Address == trimmedEmail;
    }
    catch {
        return false;
    }
}

This code goes beyond basic syntax checking by leveraging the MailAddress class in the System.Net.Mail namespace. It parses the input string into a MailAddress object. If the parsing is successful, it compares the generated address to the original string to ensure that no extra spaces or special characters were introduced during the parsing process.

Other considerations

• False Positives: This method is designed to provide accurate verification without generating false positives (invalid addresses being recognized as valid addresses).
• Validity vs. Reachability: The validity of an email address is not the same as its reachability. While validation ensures that the string format conforms to email standards, it does not guarantee successful delivery.
• Domain Name Check: Integrity checks can be implemented to enhance user experience. Checking for known top-level domains, MX records, and spelling errors can provide additional verification.

Exception handling

This code utilizes exception handling to simplify business logic. If any error occurs during MailAddress initialization, it is logically converted to an invalid email address without complex condition checks.

More resources

• System.Net.Mail.MailAddress Documentation
• Explanation of valid email address structure

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