c# - 使用 C# 创建 ics 文件并发送带有附件的电子邮件

Question

我需要发送附有 ics 文件的日历约会电子邮件，其中包含约会详细信息，我正在收到邮件，但缺少附件帮助我，有人可以解决这个问题

需要创建简单的 ics 文件并将其作为电子邮件的附件。

请看下面我试过的代码

   public IHttpActionResult cal(calendar objApptEmail)
    {
        MailMessage msg = new MailMessage();
        //Now we have to set the value to Mail message properties

        //Note Please change it to correct mail-id to use this in your application
        msg.From = new MailAddress("ssss@gmail.com", "ABC");
        msg.To.Add(new MailAddress("ssss@outlook.com", "BCD"));
        //  msg.CC.Add(new MailAddress("zzzzz@xyz.com", "DEF"));// it is optional, only if required
        //   msg.Headers.Add("Content-class", "urn:content-classes:calendarmessage");
        msg.Subject = "Send mail with ICS file as an Attachment";
        msg.Body = "Please Attend the meeting with this schedule";

        // Now Contruct the ICS file using string builder
        StringBuilder str = new StringBuilder();
        str.AppendLine("BEGIN:VCALENDAR");
        str.AppendLine("PRODID:-//Schedule a Meeting");
        str.AppendLine("VERSION:2.0");
        str.AppendLine("METHOD:REQUEST");
        str.AppendLine("BEGIN:VEVENT");
        str.AppendLine(string.Format("DTSTART:{0:yyyyMMddTHHmmssZ}", DateTime.Now.AddMinutes(+330)));
        str.AppendLine(string.Format("DTSTAMP:{0:yyyyMMddTHHmmssZ}", DateTime.UtcNow));
        str.AppendLine(string.Format("DTEND:{0:yyyyMMddTHHmmssZ}", DateTime.Now.AddMinutes(+660)));
        str.AppendLine("LOCATION: " + objApptEmail.Location);
        str.AppendLine(string.Format("UID:{0}", Guid.NewGuid()));
        str.AppendLine(string.Format("DESCRIPTION:{0}", msg.Body));
        str.AppendLine(string.Format("X-ALT-DESC;FMTTYPE=text/html:{0}", msg.Body));
        str.AppendLine(string.Format("SUMMARY:{0}", msg.Subject));
        str.AppendLine(string.Format("ORGANIZER:MAILTO:{0}", msg.From.Address));

        str.AppendLine(string.Format("ATTENDEE;CN=\"{0}\";RSVP=TRUE:mailto:{1}", msg.To[0].DisplayName, msg.To[0].Address));

        str.AppendLine("BEGIN:VALARM");
        str.AppendLine("TRIGGER:-PT15M");
        str.AppendLine("ACTION:DISPLAY");
        str.AppendLine("DESCRIPTION:Reminder");
        str.AppendLine("END:VALARM");
        str.AppendLine("END:VEVENT");
        str.AppendLine("END:VCALENDAR");

        System.Net.Mime.ContentType contype = new System.Net.Mime.ContentType("text/calendar");
        contype.Parameters.Add("method", "REQUEST");
        //  contype.Parameters.Add("name", "Meeting.ics");
        AlternateView avCal = AlternateView.CreateAlternateViewFromString(str.ToString(), contype);
        msg.AlternateViews.Add(avCal);

        //Now sending a mail with attachment ICS file.                     
        System.Net.Mail.SmtpClient smtpclient = new System.Net.Mail.SmtpClient();
        smtpclient.Host = "smtp.gmail.com"; //-------this has to given the Mailserver IP
        smtpclient.EnableSsl = true;
        smtpclient.Credentials = new System.Net.NetworkCredential("dddd@gmail.com", "xxxxx");
        smtpclient.Send(msg);
        return Ok();       

}

Answer 1

我删除了所有代码并在我的机器上测试后输入代码。这在我的情况下工作正常。在你的情况下，它不起作用尝试在 Gmail 中设置不太安全的应用程序(我看到你正在使用 gmail 发送电子邮件)

System.Net.Mail.MailMessage msg = new MailMessage("anirudhagupta01@example.com","anirudha@testing.com");

            StringBuilder str = new StringBuilder();
            str.AppendLine("BEGIN:VCALENDAR");
            str.AppendLine("PRODID:-//Schedule a Meeting");
            str.AppendLine("VERSION:2.0");
            str.AppendLine("METHOD:REQUEST");
            str.AppendLine("BEGIN:VEVENT");
            str.AppendLine(string.Format("DTSTART:{0:yyyyMMddTHHmmssZ}", DateTime.Now.AddMinutes(+330)));
            str.AppendLine(string.Format("DTSTAMP:{0:yyyyMMddTHHmmssZ}", DateTime.UtcNow));
            str.AppendLine(string.Format("DTEND:{0:yyyyMMddTHHmmssZ}", DateTime.Now.AddMinutes(+660)));
            str.AppendLine("LOCATION: " + "abcd");
            str.AppendLine(string.Format("UID:{0}", Guid.NewGuid()));
            str.AppendLine(string.Format("DESCRIPTION:{0}", msg.Body));
            str.AppendLine(string.Format("X-ALT-DESC;FMTTYPE=text/html:{0}", msg.Body));
            str.AppendLine(string.Format("SUMMARY:{0}", msg.Subject));
            str.AppendLine(string.Format("ORGANIZER:MAILTO:{0}", msg.From.Address));

            str.AppendLine(string.Format("ATTENDEE;CN=\"{0}\";RSVP=TRUE:mailto:{1}", msg.To[0].DisplayName, msg.To[0].Address));

            str.AppendLine("BEGIN:VALARM");
            str.AppendLine("TRIGGER:-PT15M");
            str.AppendLine("ACTION:DISPLAY");
            str.AppendLine("DESCRIPTION:Reminder");
            str.AppendLine("END:VALARM");
            str.AppendLine("END:VEVENT");
            str.AppendLine("END:VCALENDAR");

            byte[] byteArray = Encoding.ASCII.GetBytes(str.ToString());
            MemoryStream stream = new MemoryStream(byteArray);

            Attachment attach = new Attachment(stream,"test.ics");

            msg.Attachments.Add(attach);

            System.Net.Mime.ContentType contype = new System.Net.Mime.ContentType("text/calendar");
            contype.Parameters.Add("method", "REQUEST");
            //  contype.Parameters.Add("name", "Meeting.ics");
            AlternateView avCal = AlternateView.CreateAlternateViewFromString(str.ToString(), contype);
            msg.AlternateViews.Add(avCal);

            //Now sending a mail with attachment ICS file.                     
            System.Net.Mail.SmtpClient smtpclient = new System.Net.Mail.SmtpClient();
            smtpclient.Host = "smtp.gmail.com"; //-------this has to given the Mailserver IP
            smtpclient.EnableSsl = true;
            smtpclient.Credentials = new System.Net.NetworkCredential("anirudhagupta0011@gmail.com", "testing");
            smtpclient.Send(msg);