Send an Outlook Meeting Request with C#

问题

I am looking to send an outlook Meeting Request from C#. i have the code below that it do the job but.

string startTime1 = Convert.ToDateTime(startTime).ToString("yyyyMMddTHHmmssZ");
string endTime1 = Convert.ToDateTime(endTime).ToString("yyyyMMddTHHmmssZ");
SmtpClient sc = new SmtpClient("");

MailMessage msg = new MailMessage();

msg.From = new MailAddress("", "HR Self Service");
msg.To.Add(new MailAddress(emailto));
msg.Subject = "Holiday Approval";
msg.Body = emailbody;

StringBuilder str = new StringBuilder();
str.AppendLine("BEGIN:VCALENDAR");

//PRODID: identifier for the product that created the Calendar object
str.AppendLine("PRODID:-//ABC Company//Outlook MIMEDIR//EN");
str.AppendLine("VERSION:2.0");
str.AppendLine("METHOD:REQUEST");

str.AppendLine("BEGIN:VEVENT");

str.AppendLine(string.Format("DTSTART:{0:yyyyMMddTHHmmssZ}", startTime1));//TimeZoneInfo.ConvertTimeToUtc("BeginTime").ToString("yyyyMMddTHHmmssZ")));
str.AppendLine(string.Format("DTSTAMP:{0:yyyyMMddTHHmmssZ}", DateTime.UtcNow));
str.AppendLine(string.Format("DTEND:{0:yyyyMMddTHHmmssZ}", endTime1));//TimeZoneInfo.ConvertTimeToUtc("EndTime").ToString("yyyyMMddTHHmmssZ")));
str.AppendLine(string.Format("LOCATION: {0}", "Location"));

// UID should be unique.
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("STATUS:CONFIRMED");
str.AppendLine("BEGIN:VALARM");
str.AppendLine("TRIGGER:-PT15M");
str.AppendLine("ACTION:Accept");
str.AppendLine("DESCRIPTION:Reminder");
str.AppendLine("X-MICROSOFT-CDO-BUSYSTATUS:BUSY");
str.AppendLine("END:VALARM");
str.AppendLine("END:VEVENT");

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("END:VCALENDAR");
System.Net.Mime.ContentType ct = new System.Net.Mime.ContentType("text/calendar");
ct.Parameters.Add("method", "REQUEST");
ct.Parameters.Add("name", "meeting.ics");
AlternateView avCal = AlternateView.CreateAlternateViewFromString(str.ToString(), ct);
msg.AlternateViews.Add(avCal);
//Response.Write(str);
// sc.ServicePoint.MaxIdleTime = 2;
sc.Send(msg);

when the invitation is send, it need the user to accept the invitation, and when the user accept the invitation, Outlook calendar shows the status as BUSY
is there any way to send the invitation that does not require user to accept it and the Outlook calendar shows as Out Of Office ? i have tried with this 2 part but no luck

str.AppendLine("ACTION:Accept");
str.AppendLine("X-MICROSOFT-CDO-BUSYSTATUS:BUSY");

回答1:

If this is a resource mailbox, you can configure it to auto accept meeting invitations (File | Options | Calendar | Automatic Accept or Decline).

If this is an arbitrary mailbox, nothing happens without the owner's permission. The best you can do is directly access the mailbox using the Outlook Object Model / EWS/ MAPI if you have the user credentials.

来源：https://stackoverflow.com/questions/27383906/send-an-outlook-meeting-request-with-c-sharp

标签

ASP.NET

outlook