Adnan Rashid

I needed to integrate support for vCalendar in my current project. So i went through the vCalendar spec 1.0 at http://www.imc.org/pdi/vcal-10.txt and wrote this class. Although I have not implemented all the specification features, but this should prove sufficient for the usual requirements. If you have any comments / suggestions , let me know.

using System;
using System.Text;
using System.IO;
using System.Collections;

/// <summary>
/// Summary description for VCalendar
/// </summary>
public class VCalendar
{
	private string _productID;
	/// <summary>
	/// A unique identifier identifying the originating program
	/// </summary>
	public string ProductIdentifier
	{
		get { return _productID; }
		set { _productID = value; }
	}

	private ArrayList _categories;
	/// <summary>
	/// ArrayList of categories
	/// </summary>
	public ArrayList Categories
	{
		get { return _categories; }
		set { _categories = value; }
	}

	private DateTime _createdOn = DateTime.MinValue;
	/// <summary>
	/// DateTime that the vEvent was created.
	/// </summary>
	public DateTime CreatedOn
	{
		get { return _createdOn; }
		set { _createdOn = value; }
	}

	private DateTime _completedOn = DateTime.MinValue;
	/// <summary>
	/// DateTime the vEvent completed on
	/// </summary>
	public DateTime CompletedOn
	{
		get { return _completedOn; }
		set { _completedOn = value; }
	}

	private DateTime _startOn = DateTime.MinValue;
	/// <summary>
	/// DateTime that the vEvent will start
	/// </summary>
	public DateTime StartOn
	{
		get { return _startOn; }
		set { _startOn = value; }
	}

	private DateTime _endOn = DateTime.MinValue;
	/// <summary>
	/// DateTime that the vEvent will end
	/// </summary>
	public DateTime EndOn
	{
		get { return _endOn; }
		set { _endOn = value; }
	}

	private ClassificationType _classification = ClassificationType.PUBLIC;
	/// <summary>
	/// Defines the access classification for the vEvent entity
	/// </summary>
	public ClassificationType Classification
	{
		get { return _classification; }
		set { _classification = value; }
	}

	private int _priority = 0;
	/// <summary>
	/// 0 = undefined, 1 = High, -1 = Low. Defaults to 0
	/// </summary>
	public int Priority
	{
		get { return _priority; }
		set { _priority = value; }
	}

	private string _subject;
	/// <summary>
	/// Subject of the vEvent
	/// </summary>
	public string Subject
	{
		get { return _subject; }
		set { _subject = value; }
	}

	private string _description;
	/// <summary>
	/// Description of the vEvent
	/// </summary>
	public string Description
	{
		get { return _description; }
		set { _description = value; }
	}

	private bool _enableAlarm;
	/// <summary>
	/// Flag to enable the reminder alarm
	/// </summary>
	public bool EnableAlarm
	{
		get { return _enableAlarm; }
		set { _enableAlarm = value; }
	}

	public override string ToString()
	{
		StringBuilder sb = new StringBuilder();
		sb.Append(“BEGIN:VCALENDAR\n”);
		sb.Append(“VERSION:1.0\n”);
		sb.Append(“BEGIN:VEVENT\n”);

		// Product Identifier
		if (!string.IsNullOrEmpty(_productID))
			sb.AppendFormat(“PRODID:{0}\n”, _productID);

		// Categories
		if (_categories != null && _categories.Count != 0)
		{
			sb.Append(“CATEGORIES:”);
			for (int i = 0; i < _categories.Count; i++)
			{
				if (i == 0)
					sb.Append(_categories[0].ToString());
				else
					sb.AppendFormat(“;{0}”, _categories[i].ToString());
			}
			sb.Append(“\n”);
		}

		// Created On
		if (_createdOn != DateTime.MinValue)
			sb.AppendFormat(“DCREATED:{0}\n”, _createdOn.ToUniversalTime().ToString(“yyyyMMddTHHmmssZ”));

		// Start Date Time
		if (_startOn != DateTime.MinValue)
		{
			sb.AppendFormat(“DTSTART:{0}\n”, _startOn.ToUniversalTime().ToString(“yyyyMMddTHHmmssZ”));

			// Display Reminder
			if (_enableAlarm)
				sb.AppendFormat(“DALARM:{0};PT5M;2;{1}\n”, _startOn.ToUniversalTime().ToString(“yyyyMMddTHHmmssZ”), _subject);
		}

		// End Date Time
		if (_endOn != DateTime.MinValue)
			sb.AppendFormat(“DTEND:{0}\n”, _endOn.ToUniversalTime().ToString(“yyyyMMddTHHmmssZ”));

		// Completed On
		if (_completedOn != DateTime.MinValue)
			sb.AppendFormat(“COMPLETED:{0}\n”, _completedOn.ToUniversalTime().ToString(“yyyyMMddTHHmmssZ”));

		// Priority
		if (_priority != 0)
			sb.AppendFormat(“PRIORITY:{0}\n”, _priority);

		// Description
		if (!string.IsNullOrEmpty(_description))
			sb.AppendFormat(“DESCRIPTION:{0}\n”, _description);

		// Subject
		if (!string.IsNullOrEmpty(_subject))
			sb.AppendFormat(“SUMMARY:{0}\n”, _subject);
		if (_classification != ClassificationType.PUBLIC)
			sb.AppendFormat(“CLASS:{0}\n”, Enum.GetName(typeof(ClassificationType), Classification));
		sb.Append(“END:VEVENT\n”);
		sb.Append(“END:vCalendar”);
		return sb.ToString();
	}

	public void Generate(string filePath, FileMode mode)
	{
		FileStream fs = new FileStream(filePath, mode);
		StreamWriter sw = new StreamWriter(fs);
		using (sw)
		{
			sw.Write(this.ToString());
		}
	}
}

public class Attendee
{
	private StatusType _status;
	public StatusType Status
	{
		get { return _status; }
		set { _status = value; }
	}

	private AttendeeType _role;
	public AttendeeType Role
	{
		get { return _role; }
		set { _role = value; }
	}

	public string _attendeeName;
	public string AttendeeName
	{
		get { return _attendeeName; }
		set { _attendeeName = value; }
	}

	public override string ToString()
	{
		StringBuilder sb = new StringBuilder();
		if (!string.IsNullOrEmpty(_attendeeName))
		{
			sb.Append(“ATTENDEE”);
			if (_role != AttendeeType.ATTENDEE)
				sb.AppendFormat(“;ROLE={0}”, Enum.GetName(typeof(AttendeeType), Role));
			if (_status != StatusType.NEEDS_ACTION)
				sb.AppendFormat(“;STATUS={0}”, Enum.GetName(typeof(StatusType), Status));
			sb.AppendFormat(“:{0}\n”, _attendeeName);
			return sb.ToString();
		}
		else
			return string.Empty;
	}
}
public enum AttendeeType
{
	ATTENDEE,
	ORGANIZER,
	OWNER,
	DELEGATE,
}
public enum StatusType
{
	ACCEPTED,
	NEEDS_ACTION,
	SENT,
	TENTATIVE,
	CONFIRMED,
	DECLINED,
	COMPLETED,
	DELEGATED
}
public enum RSVPType
{
	YES,
	NO
}
public enum ExpectType
{
	FYI,
	REQUIRE,
	REQUEST,
	IMMEDIATE
}
public enum CategoryType
{
	APPOINTMENT,
	BUSINESS,
	EDUCATION,
	HOLIDAY,
	MEETING,
	MISCELLANEOUS,
	PERSONAL,
	TRAVEL,
	VACATION
}
public enum ClassificationType
{
	PUBLIC,
	PRIVATE,
	CONFIDENTIAL
}