.NET: Get all Outlook calendar items

Question

How can I get all items from a specific calendar (for a specific date). Lets say for instance that I have a calendar with a recurring item every Monday evening. When I requ

Answer 1

calendarFolder = 
    mapiNamespace.GetDefaultFolder(
        Microsoft.Office.Interop.Outlook.OlDefaultFolders.olFolderCalendar);

Answer 2

public void GetAllCalendarItems()
        {
            DataTable sample = new DataTable(); //Sample Data
            sample.Columns.Add("Subject", typeof(string));
            sample.Columns.Add("Location", typeof(string));
            sample.Columns.Add("StartTime", typeof(DateTime));
            sample.Columns.Add("EndTime", typeof(DateTime));
            sample.Columns.Add("StartDate", typeof(DateTime));
            sample.Columns.Add("EndDate", typeof(DateTime));
            sample.Columns.Add("AllDayEvent", typeof(bool));
            sample.Columns.Add("Body", typeof(string));


            listViewContacts.Items.Clear();
            oApp = new Outlook.Application();
            oNS = oApp.GetNamespace("MAPI");
            oCalenderFolder = oNS.GetDefaultFolder(Microsoft.Office.Interop.Outlook.OlDefaultFolders.olFolderCalendar);
            outlookCalendarItems = oCalenderFolder.Items;
            outlookCalendarItems.IncludeRecurrences = true;
           // DataTable sample = new DataTable();
            foreach (Microsoft.Office.Interop.Outlook.AppointmentItem item in outlookCalendarItems)
            {
                DataRow row = sample.NewRow();
                row["Subject"] = item.Subject;
                row["Location"] = item.Location;
                row["StartTime"] = item.Start.TimeOfDay.ToString();
                row["EndTime"] = item.End.TimeOfDay.ToString();
                row["StartDate"] = item.Start.Date;
                row["EndDate"] = item.End.Date;
                row["AllDayEvent"] = item.AllDayEvent;
                row["Body"] = item.Body;
                sample.Rows.Add(row);
            }
            sample.AcceptChanges();
            foreach (DataRow dr in sample.Rows)
                {
                    ListViewItem lvi = new ListViewItem(dr["Subject"].ToString());

                    lvi.SubItems.Add(dr["Location"].ToString());
                    lvi.SubItems.Add(dr["StartTime"].ToString());
                    lvi.SubItems.Add(dr["EndTime"].ToString());
                    lvi.SubItems.Add(dr["StartDate"].ToString());
                    lvi.SubItems.Add(dr["EndDate"].ToString());
                    lvi.SubItems.Add(dr["AllDayEvent"].ToString());
                    lvi.SubItems.Add(dr["Body"].ToString());



                    this.listViewContacts.Items.Add(lvi);
                }
            oApp = null;
            oNS = null;

        }

Answer 3

I found this article very useful: https://docs.microsoft.com/en-us/office/client-developer/outlook/pia/how-to-search-and-obtain-appointments-in-a-time-range

It demonstrates how to get calendar entries in a specified time range. It worked for me. Here is the source code from the article for your convenience :)

using Outlook = Microsoft.Office.Interop.Outlook;

private void DemoAppointmentsInRange()
{
    Outlook.Folder calFolder = Application.Session.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderCalendar)
        as Outlook.Folder;
    DateTime start = DateTime.Now;
    DateTime end = start.AddDays(5);
    Outlook.Items rangeAppts = GetAppointmentsInRange(calFolder, start, end);
    if (rangeAppts != null)
    {
        foreach (Outlook.AppointmentItem appt in rangeAppts)
        {
             Debug.WriteLine("Subject: " + appt.Subject 
                 + " Start: " + appt.Start.ToString("g"));
        }
    }
}

/// <summary>
/// Get recurring appointments in date range.
/// </summary>
/// <param name="folder"></param>
/// <param name="startTime"></param>
/// <param name="endTime"></param>
/// <returns>Outlook.Items</returns>
private Outlook.Items GetAppointmentsInRange(
    Outlook.Folder folder, DateTime startTime, DateTime endTime)
{
    string filter = "[Start] >= '"
        + startTime.ToString("g")
        + "' AND [End] <= '"
        + endTime.ToString("g") + "'";
    Debug.WriteLine(filter);
    try
    {
        Outlook.Items calItems = folder.Items;
        calItems.IncludeRecurrences = true;
        calItems.Sort("[Start]", Type.Missing);
        Outlook.Items restrictItems = calItems.Restrict(filter);
        if (restrictItems.Count > 0)
        {
            return restrictItems;
        }
        else
        {
            return null;
        }
    }
    catch { return null; }
 }

Answer 4

    Microsoft.Office.Interop.Outlook.Application oApp = null;
    Microsoft.Office.Interop.Outlook.NameSpace mapiNamespace = null;
    Microsoft.Office.Interop.Outlook.MAPIFolder CalendarFolder = null;
    Microsoft.Office.Interop.Outlook.Items outlookCalendarItems = null;

    oApp = new Microsoft.Office.Interop.Outlook.Application();
    mapiNamespace = oApp.GetNamespace("MAPI"); ;
    CalendarFolder = mapiNamespace.GetDefaultFolder(Microsoft.Office.Interop.Outlook.OlDefaultFolders.olFolderCalendar);
    outlookCalendarItems = CalendarFolder.Items;
    outlookCalendarItems.IncludeRecurrences = true;

    foreach (Microsoft.Office.Interop.Outlook.AppointmentItem item in outlookCalendarItems)
    {
        if (item.IsRecurring)
        {
            Microsoft.Office.Interop.Outlook.RecurrencePattern rp = item.GetRecurrencePattern();

                   // get all date 
            DateTime first = new DateTime( item.Start.Hour, item.Start.Minute, 0);
            DateTime last = new DateTime();
            Microsoft.Office.Interop.Outlook.AppointmentItem recur = null;



            for (DateTime cur = first; cur <= last; cur = cur.AddDays(1))
            {
                try
                {
                    recur = rp.GetOccurrence(cur);
                    MessageBox.Show(recur.Subject + " -> " + cur.ToLongDateString());
                }
                catch
                { }
            }
        }
        else
        {
            MessageBox.Show(item.Subject + " -> " + item.Start.ToLongDateString());
        }
    }

}

it is working I try it but you need to add reference about Microsoft outlook

Answer 5

I believe that you must Restrict or Find in order to get recurring appointments, otherwise Outlook won't expand them. Also, you must Sort by Start before setting IncludeRecurrences.