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?
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.
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 +=
"nnIf 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 + "nn";
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 = "";
}
}
}
Answers:
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Method 1
UPDATE – 09-30-2019:
Microsoft updated the documentation for this.
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 += "nnIf 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 + "nn"
+ "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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