使用MailMessage的多部分电子邮件

Question

我有一封我想从C#发送的电子邮件,它有一个vCalendar和一个HTML正文部分.

我创建了一个MailMessage,并设置了2个备用视图:

AlternateView avCal  = new AlternateView("VCALENDAR:...", null, "text/calendar");
AlternateView avHtml = new AlternateView("<p>some html</p>", null, "text/html");

mailMessage.AlternateViews.Add(avCal);
mailMessage.AlternateViews.Add(avHtml);

这给了我一个消息,一个Content-Type的multipart/alternative.

这将在我的网络邮件上显示日历约会和HTML部分,但不显示Outlook.

如何以不同的内容类型显示这样的两个不同部分？我正在寻找的更像是Content-Type: multipart/mixed"备用视图"出现的地方.

编辑

当我使用@Chris Haas的方法时,我会接近,但标记不会呈现.这似乎是无视的MailMessage.IsBodyHtml = true

不确定如何在Outlook中查看原始但只是标题...

Return-Path: <*****@****.com>
X-Footer: ZWJyaWRnZS5jb20=
Received: from localhost ([127.0.0.1])
    by mail.foo.com
    for *****@****.com;
    Wed, 2 Jan 2013 17:20:14 -0500
MIME-Version: 1.0
From: "George Washington" <*****@****.com>
To: "George Washington" <*****@****.com>
Date: 2 Jan 2013 17:29:14 -0500
Subject: To-Do: test test - test
Content-Type: multipart/mixed; 
boundary=--boundary_0_4fbc08b4-2198-45b1-bf2e-9659179aad84

Answer 1

尝试发送VCALENDAR作为Attachment与Inline属性设置为true：

using (MailMessage mm = new MailMessage("...", "...", "Subject here", "Body here")) //Pick whatever constructor you want
{
    using (Attachment a = new Attachment("c:\\test.ics", "text/calendar")) //Either load from disk or use a MemoryStream bound to the bytes of a String
    {
        a.Name = "meeting.ics";                         //Filename, possibly not required
        a.ContentDisposition.Inline = true;             //Mark as inline
        mm.Attachments.Add(a);                          //Add it to the message
        using (SmtpClient s = new SmtpClient("..."))    //Send using normal
        {
            s.Send(mm);
        }
    }
}

编辑

好的，我已经将代码更新为不依赖于文件，以便我们使用完全相同的 ICS 文件。更新顶部的字符串和SmtpClient如果需要，否则保留代码原样。ICS 来自本页的中间。

  String mailFrom = "xyz@example.com";
  String mailTo = "xyz@example.com";
  String mailSubject = "This is a test";
  String mailBody = "<p><strong>Hello</strong> world</p>";
  String smtpServer = "mail.example.com";

  using (var mm = new MailMessage()) //Pick whatever constructor you want
  {
      mm.To.Add(mailFrom);
      mm.From = new MailAddress(mailTo);
      mm.Subject = mailSubject;
      mm.Body = mailBody;
      mm.IsBodyHtml = true;
      String t = "BEGIN:VCALENDAR\r\n" +
                 "METHOD:REQUEST\r\n" +
                 "BEGIN:VEVENT\r\n" +
                 "DTSTAMP:20080325T202857Z\r\n" +
                 "DTSTART:20080325T200000Z\r\n" +
                 "DTEND:20080325T220000Z\r\n" +
                 "SUMMARY:Test meeting request\r\n" +
                 "UID:040000008200E00074C5B7101A82E00800000000B2BB07349575C80100000000000000001000000019BF8D0149C50643A81325C54140C093\r\n" +
                 "ATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN=\"Dan\":MAIL\r\n" +
                 " TO:myuser@mydom.com\r\n" +
                 "ORGANIZER;CN=\"Administrator\":MAILTO:administrator@mydom.com\r\n" +
                 "LOCATION: Here\r\n" +
                 "DESCRIPTION:Test Request\r\n" +
                 "SEQUENCE:0\r\n" +
                 "PRIORITY:5\r\n" +
                 "CLASS:\r\n" +
                 "CREATED:20080321T190958Z\r\n" +
                 "STATUS:CONFIRMED\r\n" +
                 "TRANSP:OPAQUE\r\n" +
                 "END:VEVENT\r\n" +
                 "END:VCALENDAR";
      Byte[] bytes = System.Text.Encoding.ASCII.GetBytes(t);
      using (var ms = new System.IO.MemoryStream(bytes))
      {
          using (var a = new Attachment(ms, "meeting.ics", "text/calendar")) //Either load from disk or use a MemoryStream bound to the bytes of a String
          {
              a.ContentDisposition.Inline = true;             //Mark as inline
              mm.Attachments.Add(a);                          //Add it to the message
              using (SmtpClient s = new SmtpClient(smtpServer))    //Send using normal
              {
                  s.Send(mm);
              }
          }
      }

  }