encoding to UTF-8 in email

问题:

I have a client that is receiving email incorrectly encoded. I am using the System.Net.Mail class and setting the body encoding to UTF-8. I have done a bit of reading and since I have to set the body of the email as a string encoding the data to a UTF-8 byte array really does nothing for me since I have to convert is back to a string that is UTF-16. Correct?

when I send: Il s'agit d'un message de test pour déterminer comment le système va gérer les messages envoyés à l'aide des caractères français. Merci et bonne journée.

They see: *Il s'agit d'un message de test pour déterminer comment le système va gérer les messages envoyés à l'aide des caractères français.

Merci et bonne journée.*

I have tried different encodings on the email, but I am really suspecting that the client is incorrectly decoding the email since my email client displays this correctly. Am I missing something? Is there something else that can be done?

code below

SmtpMailService.SendMail(string.Empty, toAddress, "[e-mail]", "", subject, sb.ToString(), false);

 public static bool SendMail(string fromAddress, string toAddress, string ccAddress, string bccAddress, string subject, string body, bool isHtmlBody)
    {

        if (String.IsNullOrEmpty(toAddress)) return false;
        var toMailAddress = new MailAddress(toAddress);

        var fromMailAddress = new MailAddress(String.IsNullOrEmpty(fromAddress) ? DefaultFromAddress : fromAddress);

        var mailMessage = new MailMessage(fromMailAddress, toMailAddress);

        if (!String.IsNullOrEmpty(ccAddress))
        {
            mailMessage.CC.Add(new MailAddress(ccAddress));
        }

        if (!String.IsNullOrEmpty(bccAddress))
        {
            mailMessage.Bcc.Add(new MailAddress(bccAddress));
        }

        if (!string.IsNullOrEmpty(fromAddress)) mailMessage.Headers.Add("Reply-To", fromAddress);

        mailMessage.Subject = subject;
        mailMessage.IsBodyHtml = isHtmlBody;
        mailMessage.Body = body;
        mailMessage.BodyEncoding = System.Text.Encoding.UTF8;

        var enableSslCfg = ConfigurationManager.AppSettings["Email.Ssl"];
        var enableSsl = string.IsNullOrEmpty(enableSslCfg) || bool.Parse(enableSslCfg);
        var client = new SmtpClient {EnableSsl = enableSsl};

        client.Send(mailMessage);


        return true;
    }

回答1:

What finally solved my problem was setting the contenttype on the alternate view. Just setting the msg.BodyEncoding didn't work in (among others) Outlook although Gmail displayed the email correctly.

    var msg = new MailMessage()
    msg.BodyEncoding = Encoding.GetEncoding(1252);
    msg.IsBodyHtml = true;
    //htmlBody is a string containing the entire body text
    var htmlView = AlternateView.CreateAlternateViewFromString(htmlBody, new ContentType("text/html"));
    //This does the trick
    htmlView.ContentType.CharSet = Encoding.UTF8.WebName;
    msg.AlternateViews.Add(htmlView);

回答2:

Your example clearly shows that the text you send has UTF-8 encoding, which is interpreted as Windows-1252 or ISO-8859-1 encoding (see the results of several encoding errors, especially the last row in the table here).

So your code seems to be alright, the problem might be that client side just ignores the encoding of the mail body (for example because they embed it into an HTML page and the wrapper HTML uses the default ISO-8859-1 encoding).

Try to send the mail to another provider (eg. Gmail) and check the results. Well configured providers should handle the body encoding.

Solution 1

If the assumptions above are true the error must be fixed on client side. They should either process the body encoding or if it is always UTF-8, they should simply add the following tag into HTML header:

<meta http-equiv="content-type" content="text/html; charset=UTF-8">

Solution 2

If you cannot affect the client side at any cost you might want to try to use another encoding:

mailMessage.BodyEncoding = System.Text.Encoding.GetEncoding("ISO-8859-1");

Please note that your French example will be correct this way; however, non-Western European languages will not be displayed correctly.

回答3:

The only way is to replace the character with suitable character as you are using character map and the html is encoding your code to different garbage character

you can modify your code like :

WebClient myClient = new WebClient();

        byte[] requestHTML;
        string currentPageUrl = HttpContext.Current.Request.Url.AbsoluteUri;
        UTF8Encoding utf8 = new UTF8Encoding();
        requestHTML = myClient.DownloadData(currentPageUrl);
        var str = utf8.GetString(requestHTML);"
        str = str.Replace("’", "'");

回答4:

Try:

mailMessage.BodyEncoding = UTF8Encoding.UTF8;

instead of:

mailMessage.BodyEncoding = System.Text.Encoding.UTF8;