C#同时发送超文本标记语言和文本电子邮件-最优雅？
C#同时发送超文本标记语言和文本电子邮件-最优雅？
提问于 2010-08-11 15:50:50
同时发送HTML和文本电子邮件是最佳实践吗？
如果我只发送HTML，有什么危险？
我在想下面这样的事情
try
{
// Assign a sender, recipient and subject to new mail message
MailAddress sender =
new MailAddress("sender@johnnycoder.com", "Sender");
MailAddress recipient =
new MailAddress("recipient@johnnycoder.com", "Recipient");
MailMessage m = new MailMessage(sender, recipient);
m.Subject = "Test Message";
// Define the plain text alternate view and add to message
string plainTextBody =
"You must use an email client that supports HTML messages";
AlternateView plainTextView =
AlternateView.CreateAlternateViewFromString(
plainTextBody, null, MediaTypeNames.Text.Plain);
m.AlternateViews.Add(plainTextView);
// Define the html alternate view with embedded image and
// add to message. To reference images attached as linked
// resources from your HTML message body, use "cid:contentID"
// in the <img> tag...
string htmlBody =
"<html><body><h1>Picture</h1><br>" +
"<img src=\"cid:SampleImage\"></body></html>";
AlternateView htmlView =
AlternateView.CreateAlternateViewFromString(
htmlBody, null, MediaTypeNames.Text.Html);
// ...and then define the actual LinkedResource matching the
// ContentID property as found in the image tag. In this case,
// the HTML message includes the tag
// <img src=\"cid:SampleImage\"> and the following
// LinkedResource.ContentId is set to "SampleImage"
LinkedResource sampleImage =
new LinkedResource("sample.jpg",
MediaTypeNames.Image.Jpeg);
sampleImage.ContentId = "SampleImage";
htmlView.LinkedResources.Add(sampleImage);
m.AlternateViews.Add(htmlView);
// Finally, configure smtp or alternatively use the
// system.net mailSettings
SmtpClient smtp = new SmtpClient
{
Host = "smtp.example.com",
UseDefaultCredentials = false,
Credentials =
new NetworkCredential("username", "password")
};
//<system.net>
// <mailSettings>
// <smtp deliveryMethod="Network">
// <network host="smtp.example.com"
// port="25" defaultCredentials="true"/>
// </smtp>
// </mailSettings>
//</system.net>
smtp.Send(m);
}
catch (ArgumentException)
{
throw new
ArgumentException("Undefined sender and/or recipient.");
}
catch (FormatException)
{
throw new
FormatException("Invalid sender and/or recipient.");
}
catch (InvalidOperationException)
{
throw new
InvalidOperationException("Undefined SMTP server.");
}
catch (SmtpFailedRecipientException)
{
throw new SmtpFailedRecipientException(
"The mail server says that there is no mailbox for recipient");
}
catch (SmtpException ex)
{
// Invalid hostnames result in a WebException InnerException that
// provides a more descriptive error, so get the base exception
Exception inner = ex.GetBaseException();
throw new SmtpException("Could not send message: " + inner.Message);
}回答 2
Stack Overflow用户
发布于 2010-08-11 16:03:32
同时发送这两个邮件的另一个原因是，许多邮件服务器将只包含HTML内容的电子邮件标记为垃圾邮件。你不希望你所有的电子邮件都被放在垃圾文件夹里。
Stack Overflow用户
发布于 2016-10-21 19:30:34
多个电子邮件客户端将使用添加到AlternateViews的最后一个AlternateView。
因此，如果您更喜欢将邮件显示为HTML，请务必添加最后一个。
我注意到IOS邮件和OSX邮件都有这个问题，而Android电子邮件似乎更喜欢HTML。我不确定哪个版本是有效的，而且行为通常是用户可配置的，但根据我的经验，这些都是默认的。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/3456346
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