使用AlternateView生成HTML电子邮件的正确语法 [英] Correct Syntax for Generating HTML Email using AlternateView
问题描述
我正在尝试使用 AlternateView 来满足HTML和Text客户端。我宁愿使用HTML，只有在必要时才回到文本。我开始重新编码一个旧的控制台应用程序来做到这一点，但是我的代码中仍然有回车符和换行符为/ r / n，我的问题是试图找出如何以及在哪里使用Environment.Newline而不是这些？
I'm trying to use the AlternateView to cater for both HTML and Text clients. I would prefer to use HTML and only fall back to text where necessary. I started re-coding an old console app to do this but I still have carriage returns and newlines as "/r/n" in my code and my problem is trying to figure out how and where to use Environment.Newline instead of these?
现在，控制台应用程序正在从Web表单中调用。我遇到一些调试困难，最终计划是为此创建一个WCF服务。
Right now, the console application is being called from a Web form. I'm experiencing some difficulties debugging and the eventual plan is to create a WCF service for this.
我认为我遇到的困难是确定AlternateView实际上为我相反，在文本和HTML版本中，我必须分开显式地编码多少电子邮件正文。具体来说，我在下面的代码的最后的其他块中还有旧的回车符和换行符，我试图找出一个更优雅的方法。
I think the difficulty I'm having is determining what AlternateView actually does for me as opposed to how much of the email body I have to explicitly code separately, in text and HTML versions. Specifically, I still have old carriage returns and newlines in the final else block of the following code and I'm trying to figure out a more elegant way of doing this.
// args[0] - Subject
// args[1] - Message (uses all Environment.Newlines)
// args[2] - RfpID
static void Main(string[] args)
{
string subject = args[0];
string message = args[1];
// Get programatic access to the email information stored in the web.config file
string emailHost = WebConfigurationManager.AppSettings["EmailHost"];
string fromAddress = WebConfigurationManager.AppSettings["FromEmailAddress"];
SmtpClient client = new SmtpClient(emailHost);
int count = 0;
using (SqlDataReader dr = MailerDALC.GetAddressesByRFP(Convert.ToInt32(args[2])))
{
string hash;
while (dr.Read())
{
MailMessage mailMessage = new MailMessage();
mailMessage.IsBodyHtml = true;
mailMessage.SubjectEncoding = System.Text.Encoding.UTF8;
mailMessage.BodyEncoding = System.Text.Encoding.UTF8;
using (AlternateView textPart =
AlternateView.CreateAlternateViewFromString(mailMessage.Body,
System.Text.Encoding.UTF8, "text/plain"))
{
textPart.TransferEncoding =
System.Net.Mime.TransferEncoding.QuotedPrintable;
mailMessage.AlternateViews.Add(textPart);
}
using (AlternateView htmlPart =
AlternateView.CreateAlternateViewFromString(mailMessage.Body,
System.Text.Encoding.UTF8, "text/html"))
{
htmlPart.TransferEncoding =
System.Net.Mime.TransferEncoding.QuotedPrintable;
mailMessage.AlternateViews.Add(htmlPart);
}
mailMessage.Priority = MailPriority.High;
mailMessage.From = new MailAddress(fromAddress);
mailMessage.Subject = subject;
mailMessage.To.Add(new MailAddress(dr["EmailAddress"].ToString()));
if ((bool)dr["SecondaryNotify"])
mailMessage.Bcc.Add(new MailAddress(dr["SecondaryEmail"].ToString()));
// Send email in batches of 100 with a 30 second pause between each batch
if ((count >= 100) && (count % 100 == 0))
Thread.Sleep(30000);
// Check well-formedness of each email adddress
if (!IsWellformedEmailAddr(mailMessage.To.ToString()))
{
LogError(dr[1].ToString()
+ " is a malformed email address.
Message was not sent to this subscriber "
+ dr[1].ToString() + ".", "");
continue;
}
else
{
mailMessage.Body = message;
hash = dr["Hash"].ToString();
mailMessage.Body +=
"\n\nIf you no longer wish to receive notifications, you can "
+ "unsubscribe and your details will be removed from our system:\n"
+ "http://example.com/apps/vendorreg/unsubscribe.aspx?unsub="
+ hash + "\n\n";
mailMessage.Body += "My Website Policies:\n"
+ "http://example.com/doc/help/policies/help_website_policies";
client.Send(mailMessage.From.Address, mailMessage.To[0].ToString(),
mailMessage.Subject, mailMessage.Body);
count++;
}
hash = "";
}
}
}
推荐答案
据我所知，我不得不明确提供一个纯文本和HTML版本的消息体。 MSDN文档不是很有帮助。这是我创建的代码片段，以使其正常工作：
As I guessed, I had to explicitly provide a plain text and HTML version of the message body. The MSDN documentation was not very helpful. Here's a snippet of the code I created to get this working:
// args[0] - Subject
// args[1] - Plain text body content
// args[2] - HTML body content
// args[3] - RfpID
textMessage += "\n\nIf you no longer wish to receive notifications, you can "
+ "unsubscribe and your details will be removed from our system:\n"
+ "http://example.com/apps/vendorreg/unsubscribe.aspx?unsub=" + hash + "\n\n"
+ "Example Website Policies:\n"
+ "http://example.com/doc/help/policies/help_website_policies";
// Important: Mime standard dictates that text version must come first
using (AlternateView textPart =
AlternateView.CreateAlternateViewFromString(textMessage, null, "text/plain"))
{
textPart.TransferEncoding = System.Net.Mime.TransferEncoding.QuotedPrintable;
mailMessage.AlternateViews.Add(textPart);
mailMessage.IsBodyHtml = false;
mailMessage.Body = textMessage;
}
htmlMessage += Environment.NewLine + Environment.NewLine
+ "If you no longer wish to receive notifications, you can "
+ "unsubscribe and your details will be removed from our system:"
+ Environment.NewLine
+ "http://example.com/apps/vendorreg/unsubscribe.aspx?unsub=" + hash
+ Environment.NewLine + Environment.NewLine
+ "Example.com Website Policies:"
+ Environment.NewLine
+ "http://example.com/doc/help/policies/help_website_policies";
using (AlternateView htmlPart =
AlternateView.CreateAlternateViewFromString(htmlMessage,
System.Text.Encoding.UTF8, "text/html"))
{
htmlPart.TransferEncoding = System.Net.Mime.TransferEncoding.QuotedPrintable;
mailMessage.AlternateViews.Add(htmlPart);
mailMessage.IsBodyHtml = true;
mailMessage.Body = htmlMessage;
}
// Send email
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