Creating vCal appointments in C#
Straightforward vCal creation code.
Mar 13 2008
To be honest I used the code here and here to get started. And finding even those two items was rather painful. However manipulating an appointment on an exchange server is actually pretty easy once you get used to WebDAV. However finding the info to help you do just that is a little daunting. That being said I've been able to cobble together a class that can create an appointment/meeting and save it to a person's calendar, email that appointment to the various invitees, send out cancellations of that meeting, and also delete an appointment from someone's calendar.
/\*
Copyright (c) 2010 <a href="http://www.gutgames.com">James Craig</a>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.\*/
#region Usings
using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Mail;
using System.Text;
#endregion
namespace Utilities.Exchange
{
/// <summary>
/// Utility class for creating and sending an appointment
/// </summary>
public class Appointment
{
#region Constructor
/// <summary>
/// Constructor
/// </summary>
public Appointment()
{
AttendeeList = new MailAddressCollection();
Attachments = new List<Attachment>();
}
#endregion
#region Public Functions
/// <summary>
/// Adds an appointment to a user's calendar
/// </summary>
public virtual void AddAppointment()
{
string XMLNSInfo = "xmlns:g=\\"DAV:\\" "
+ "xmlns:e=\\"http://schemas.microsoft.com/exchange/\\" "
+ "xmlns:mapi=\\"http://schemas.microsoft.com/mapi/\\" "
+ "xmlns:mapit=\\"http://schemas.microsoft.com/mapi/proptag/\\" "
+ "xmlns:x=\\"xml:\\" xmlns:cal=\\"urn:schemas:calendar:\\" "
+ "xmlns:dt=\\"urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/\\" "
+ "xmlns:header=\\"urn:schemas:mailheader:\\" "
+ "xmlns:mail=\\"urn:schemas:httpmail:\\"";
string CalendarInfo = "<cal:location>" + Location + "</cal:location>"// + Location + "</cal:location>"
+ "<cal:dtstart dt:dt=\\"dateTime.tz\\">" + StartDate.ToUniversalTime().ToString("yyyy-MM-ddTHH:mm:ss.000Z") + "</cal:dtstart>"// + StartDate.ToUniversalTime().ToString("yyyyMMddTHHmmssZ") + "</cal:dtstart>"
+ "<cal:dtend dt:dt=\\"dateTime.tz\\">" + EndDate.ToUniversalTime().ToString("yyyy-MM-ddTHH:mm:ss.000Z") + "</cal:dtend>"// + EndDate.ToUniversalTime().ToString("yyyyMMddTHHmmssZ") + "</cal:dtend>"
+ "<cal:instancetype dt:dt=\\"int\\">0</cal:instancetype>"
+ "<cal:busystatus>BUSY</cal:busystatus>"
+ "<cal:meetingstatus>CONFIRMED</cal:meetingstatus>"
+ "<cal:alldayevent dt:dt=\\"boolean\\">0</cal:alldayevent>"
+ "<cal:responserequested dt:dt=\\"boolean\\">1</cal:responserequested>"
+ "<cal:reminderoffset dt:dt=\\"int\\">900</cal:reminderoffset>"
+ "<cal:uid>" + MeetingGUID.ToString("B") + "</cal:uid>";
string HeaderInfo = "<header:to>" + AttendeeList.ToString() + "</header:to>";
string MailInfo = "<mail:subject>" + Subject + "</mail:subject>"
+ "<mail:htmldescription>" + Summary + "</mail:htmldescription>";
string AppointmentRequest = "<?xml version=\\"1.0\\"?>"
+ "<g:propertyupdate " + XMLNSInfo + ">"
+ "<g:set><g:prop>"
+ "<g:contentclass>urn:content-classes:appointment</g:contentclass>"
+ "<e:outlookmessageclass>IPM.Appointment</e:outlookmessageclass>"
+ MailInfo
+ CalendarInfo
+ HeaderInfo
+ "<mapi:finvited dt:dt=\\"boolean\\">1</mapi:finvited>"
+ "</g:prop></g:set>"
+ "</g:propertyupdate>";
System.Net.HttpWebRequest PROPPATCHRequest = (System.Net.HttpWebRequest)HttpWebRequest.Create(ServerName + "/exchange/" + Directory + "/Calendar/" + MeetingGUID.ToString() + ".eml");
System.Net.CredentialCache MyCredentialCache = new System.Net.CredentialCache();
if (!string.IsNullOrEmpty(UserName) && !string.IsNullOrEmpty(Password))
{
MyCredentialCache.Add(new System.Uri(ServerName + "/exchange/" + Directory + "/Calendar/" + MeetingGUID.ToString() + ".eml"),
"NTLM",
new System.Net.NetworkCredential(UserName, Password));
}
else
{
MyCredentialCache.Add(new System.Uri(ServerName + "/exchange/" + Directory + "/Calendar/" + MeetingGUID.ToString() + ".eml"),
"Negotiate",
(System.Net.NetworkCredential)CredentialCache.DefaultCredentials);
}
PROPPATCHRequest.Credentials = MyCredentialCache;
PROPPATCHRequest.Method = "PROPPATCH";
byte\[\] bytes = Encoding.UTF8.GetBytes((string)AppointmentRequest);
PROPPATCHRequest.ContentLength = bytes.Length;
using (System.IO.Stream PROPPATCHRequestStream = PROPPATCHRequest.GetRequestStream())
{
PROPPATCHRequestStream.Write(bytes, 0, bytes.Length);
PROPPATCHRequestStream.Close();
PROPPATCHRequest.ContentType = "text/xml";
System.Net.WebResponse PROPPATCHResponse = (System.Net.HttpWebResponse)PROPPATCHRequest.GetResponse();
PROPPATCHResponse.Close();
}
}
/// <summary>
/// Emails an appointment to the specified users
/// </summary>
public virtual void EmailAppointment()
{
using (MailMessage Mail = new MailMessage())
{
System.Net.Mime.ContentType TextType = new System.Net.Mime.ContentType("text/plain");
using (AlternateView TextView = AlternateView.CreateAlternateViewFromString(GetText(), TextType))
{
System.Net.Mime.ContentType HTMLType = new System.Net.Mime.ContentType("text/html");
using (AlternateView HTMLView = AlternateView.CreateAlternateViewFromString(GetHTML(false), HTMLType))
{
System.Net.Mime.ContentType CalendarType = new System.Net.Mime.ContentType("text/calendar");
CalendarType.Parameters.Add("method", "REQUEST");
CalendarType.Parameters.Add("name", "meeting.ics");
using (AlternateView CalendarView = AlternateView.CreateAlternateViewFromString(GetCalendar(false), CalendarType))
{
CalendarView.TransferEncoding = System.Net.Mime.TransferEncoding.SevenBit;
Mail.AlternateViews.Add(TextView);
Mail.AlternateViews.Add(HTMLView);
Mail.AlternateViews.Add(CalendarView);
Mail.From = new MailAddress(OrganizerEmail);
foreach (MailAddress attendee in AttendeeList)
{
Mail.To.Add(attendee);
}
Mail.Subject = Subject;
foreach (Attachment Attachment in Attachments)
{
Mail.Attachments.Add(Attachment);
}
SmtpClient Server = new SmtpClient(ServerName, Port);
if (!string.IsNullOrEmpty(UserName) && !string.IsNullOrEmpty(Password))
{
Server.Credentials = new System.Net.NetworkCredential(UserName, Password);
}
if (AttendeeList.Count > 0)
{
Server.Send(Mail);
}
}
}
}
}
}
/// <summary>
/// Sends a cancellation to the people specified
/// </summary>
public virtual void SendCancelEmails()
{
using (MailMessage Mail = new MailMessage())
{
System.Net.Mime.ContentType TextType = new System.Net.Mime.ContentType("text/plain");
using (AlternateView TextView = AlternateView.CreateAlternateViewFromString(GetText(), TextType))
{
System.Net.Mime.ContentType HTMLType = new System.Net.Mime.ContentType("text/html");
using (AlternateView HTMLView = AlternateView.CreateAlternateViewFromString(GetHTML(true), HTMLType))
{
System.Net.Mime.ContentType CalendarType = new System.Net.Mime.ContentType("text/calendar");
CalendarType.Parameters.Add("method", "CANCEL");
CalendarType.Parameters.Add("name", "meeting.ics");
using (AlternateView CalendarView = AlternateView.CreateAlternateViewFromString(GetCalendar(true), CalendarType))
{
CalendarView.TransferEncoding = System.Net.Mime.TransferEncoding.SevenBit;
Mail.AlternateViews.Add(TextView);
Mail.AlternateViews.Add(HTMLView);
Mail.AlternateViews.Add(CalendarView);
Mail.From = new MailAddress(OrganizerEmail);
foreach (MailAddress attendee in AttendeeList)
{
Mail.To.Add(attendee);
}
Mail.Subject = Subject + " - Cancelled";
foreach (Attachment Attachment in Attachments)
{
Mail.Attachments.Add(Attachment);
}
SmtpClient Server = new SmtpClient(ServerName, Port);
if (!string.IsNullOrEmpty(UserName) && !string.IsNullOrEmpty(Password))
{
Server.Credentials = new System.Net.NetworkCredential(UserName, Password);
}
if (AttendeeList.Count > 0)
{
Server.Send(Mail);
}
}
}
}
}
}
/// <summary>
/// Cancels an appointment on someone's calendar
/// </summary>
public virtual void CancelAppointment()
{
System.Net.HttpWebRequest PROPPATCHRequest = (System.Net.HttpWebRequest)HttpWebRequest.Create(ServerName + "/exchange/" + Directory + "/Calendar/" + MeetingGUID.ToString() + ".eml");
System.Net.CredentialCache MyCredentialCache = new System.Net.CredentialCache();
if (!string.IsNullOrEmpty(UserName) && !string.IsNullOrEmpty(Password))
{
MyCredentialCache.Add(new System.Uri(ServerName + "/exchange/" + Directory + "/Calendar/" + MeetingGUID.ToString() + ".eml"),
"NTLM",
new System.Net.NetworkCredential(UserName, Password));
}
else
{
MyCredentialCache.Add(new System.Uri(ServerName + "/exchange/" + Directory + "/Calendar/" + MeetingGUID.ToString() + ".eml"),
"Negotiate",
(System.Net.NetworkCredential)CredentialCache.DefaultCredentials);
}
PROPPATCHRequest.Credentials = MyCredentialCache;
PROPPATCHRequest.Method = "DELETE";
System.Net.WebResponse PROPPATCHResponse = (System.Net.HttpWebResponse)PROPPATCHRequest.GetResponse();
PROPPATCHResponse.Close();
}
#endregion
#region Private Functions
/// <summary>
/// Returns the text version of the appointment
/// </summary>
/// <returns>A text version of the appointment</returns>
private string GetText()
{
string Body = "Type:Single Meeting\\n" +
"Organizer:" + OrganizerName + "\\n" +
"Start Time:" + StartDate.ToLongDateString() + " " + StartDate.ToLongTimeString() + "\\n" +
"End Time:" + EndDate.ToLongDateString() + " " + EndDate.ToLongTimeString() + "\\n" +
"Time Zone:" + System.TimeZone.CurrentTimeZone.StandardName + "\\n" +
"Location: " + Location + "\\n\\n" +
"\*~\*~\*~\*~\*~\*~\*~\*~\*~\*\\n\\n" +
Summary;
return Body;
}
/// <summary>
/// Gets an HTML version of the appointment
/// </summary>
/// <param name="Canceled">If true it returns a cancellation, false it returns a request</param>
/// <returns>An HTML version of the appointment</returns>
private string GetHTML(bool Canceled)
{
string bodyHTML = "<!DOCTYPE HTML PUBLIC \\"-//W3C//DTD HTML 3.2//EN\\">\\r\\n<HTML>\\r\\n<HEAD>\\r\\n<META HTTP-EQUIV=\\"Content-Type\\" CONTENT=\\"text/html; charset=utf-8\\">\\r\\n<META NAME=\\"Generator\\" CONTENT=\\"MS Exchange Server version 6.5.7652.24\\">\\r\\n<TITLE>{0}</TITLE>\\r\\n</HEAD>\\r\\n<BODY>\\r\\n<!-- Converted from text/plain format -->\\r\\n<P><FONT SIZE=2>Type:Single Meeting<BR>\\r\\nOrganizer:{1}<BR>\\r\\nStart Time:{2}<BR>\\r\\nEnd Time:{3}<BR>\\r\\nTime Zone:{4}<BR>\\r\\nLocation:{5}<BR>\\r\\n<BR>\\r\\n\*~\*~\*~\*~\*~\*~\*~\*~\*~\*<BR>\\r\\n<BR>\\r\\n{6}<BR>\\r\\n</FONT>\\r\\n</P>\\r\\n\\r\\n</BODY>\\r\\n</HTML>";
string TempSummary = Summary;
if (Canceled)
{
TempSummary += " - Canceled";
}
return string.Format(bodyHTML,
TempSummary,
OrganizerName,
StartDate.ToLongDateString() + " " + StartDate.ToLongTimeString(),
EndDate.ToLongDateString() + " " + EndDate.ToLongTimeString(),
System.TimeZone.CurrentTimeZone.StandardName,
Location,
TempSummary);
}
/// <summary>
/// Gets an iCalendar version of the appointment
/// </summary>
/// <param name="Canceled">If true, it returns a cancellation version.
/// If false, it returns a request version.</param>
/// <returns>An iCalendar version of the appointment</returns>
private string GetCalendar(bool Canceled)
{
string DateFormatUsing = "yyyyMMddTHHmmssZ";
string Method;
if (!Canceled)
Method = "REQUEST";
else
Method = "CANCEL";
string bodyCalendar = "BEGIN:VCALENDAR\\r\\nMETHOD:{10}\\r\\nPRODID:Microsoft CDO for Microsoft Exchange\\r\\nVERSION:2.0\\r\\nBEGIN:VTIMEZONE\\r\\nTZID:(GMT-06.00) Central Time (US & Canada)\\r\\nX-MICROSOFT-CDO-TZID:11\\r\\nBEGIN:STANDARD\\r\\nDTSTART:16010101T020000\\r\\nTZOFFSETFROM:-0500\\r\\nTZOFFSETTO:-0600\\r\\nRRULE:FREQ=YEARLY;WKST=MO;INTERVAL=1;BYMONTH=11;BYDAY=1SU\\r\\nEND:STANDARD\\r\\nBEGIN:DAYLIGHT\\r\\nDTSTART:16010101T020000\\r\\nTZOFFSETFROM:-0600\\r\\nTZOFFSETTO:-0500\\r\\nRRULE:FREQ=YEARLY;WKST=MO;INTERVAL=1;BYMONTH=3;BYDAY=2SU\\r\\nEND:DAYLIGHT\\r\\nEND:VTIMEZONE\\r\\nBEGIN:VEVENT\\r\\nDTSTAMP:{8}\\r\\nDTSTART:{0}\\r\\nSUMMARY:{7}\\r\\nUID:{5}\\r\\nATTENDEE;ROLE=REQ-PARTICIPANT;PARTSTAT=NEEDS-ACTION;RSVP=TRUE;CN=\\"{9}\\":MAILTO:{9}\\r\\nACTION;RSVP=TRUE;CN=\\"{4}\\":MAILTO:{4}\\r\\nORGANIZER;CN=\\"{3}\\":mailto:{4}\\r\\nLOCATION:{2}\\r\\nDTEND:{1}\\r\\nDESCRIPTION:{7}\\\\N\\r\\nSEQUENCE:1\\r\\nPRIORITY:5\\r\\nCLASS:\\r\\nCREATED:{8}\\r\\nLAST-MODIFIED:{8}\\r\\nSTATUS:CONFIRMED\\r\\nTRANSP:OPAQUE\\r\\nX-MICROSOFT-CDO-BUSYSTATUS:BUSY\\r\\nX-MICROSOFT-CDO-INSTTYPE:0\\r\\nX-MICROSOFT-CDO-INTENDEDSTATUS:BUSY\\r\\nX-MICROSOFT-CDO-ALLDAYEVENT:FALSE\\r\\nX-MICROSOFT-CDO-IMPORTANCE:1\\r\\nX-MICROSOFT-CDO-OWNERAPPTID:-1\\r\\nX-MICROSOFT-CDO-ATTENDEE-CRITICAL-CHANGE:{8}\\r\\nX-MICROSOFT-CDO-OWNER-CRITICAL-CHANGE:{8}\\r\\nBEGIN:VALARM\\r\\nACTION:DISPLAY\\r\\nDESCRIPTION:REMINDER\\r\\nTRIGGER;RELATED=START:-PT00H15M00S\\r\\nEND:VALARM\\r\\nEND:VEVENT\\r\\nEND:VCALENDAR\\r\\n";
bodyCalendar = string.Format(bodyCalendar,
StartDate.ToUniversalTime().ToString(DateFormatUsing),
EndDate.ToUniversalTime().ToString(DateFormatUsing),
Location,
OrganizerName,
OrganizerEmail,
MeetingGUID.ToString("B"),
Summary,
Subject,
DateTime.Now.ToUniversalTime().ToString(DateFormatUsing),
AttendeeList.ToString(),
Method);
return bodyCalendar;
}
#endregion
#region Variables
public DateTime StartDate;
public DateTime EndDate;
public string Subject;
public string Summary;
public string Location;
public MailAddressCollection AttendeeList;
public string OrganizerName;
public string OrganizerEmail;
public List<Attachment> Attachments;
public Guid MeetingGUID;
public string Directory;
public string ServerName;
public string UserName;
public string Password;
public int Port;
#endregion
}
}The code is apart of my utilities library and as such might have been updated since this posting. Anyway, you may run into an issue with the code if you are using Exchange 2010. In 2010, WebDAV was deprecated and the code above uses WebDAV to communicate with the server. Unfortunately I do not have a copy of Exchange 2010 to play around with so I haven't added the code for that situation. But if you're running an earlier version, it should work.
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