1.直接编码方式
遵循rfc5545x协议标准开发，参考链接 https://tools.ietf.org/html/rfc5545，正常遵循此标准开发的Calendar都是兼容的，比如Gmail。
优点：不依赖第三方组件
缺点：实现相对复杂些
2.可以实现功能
发送 修改 取消（取消之后，支持修改，修改之后，状态是未取消状态） 支持添加附件 内容支持html格式 循环功能，支持Daily、Weekly、Monthly、Yearly
3.与Outlook发送的区别：
Organizer暂时在Calendar看不到自己的Appointment，所以本文所介绍的方案比较适合作为系统发送的Appointment的场景。
4.实现代码
1 public static void SendMeeting(ref string appointmentID, MailAddress from, MailAddressCollection to, MailAddressCollection cc, MailAddressCollection bcc, string subject, string body, DateTimeOffset dtStart, DateTimeOffset dtEnd, string location, Collection<Attachment> attachments, MailAddress sender, string smtp, int port, string account, string password, bool async, METHOD method, int utcOffset, RecurType recurType, DateTimeOffset recurEndByDate,bool isRecurEndbyDate,int recurEndAfterOccurences, RecurDaily recurDaily, RecurWeekly recurWeekly,RecurMonthly recurMonthly,RecurYearly recurYearly, string originalSenderAuto = "", string originalMessageAutoID = "", bool isLocalTimeZone = true,bool isAllDay=false)
2 {
3 // CIPPlanner.CIPAce.Configuration.Configuration syscfg = new CIPPlanner.CIPAce.Configuration.Configuration();
4 if (from == null) from = new MailAddress(ApplicationSetting.SmtpFrom);
5 if (smtp == null) smtp = ApplicationSetting.SmtpServer;
6 if (port <= 0) port = ApplicationSetting.SmtpPort;
7 if (sender == null) sender = new MailAddress(ApplicationSetting.SmtpSender);
8 if (account == null) account = ApplicationSetting.SmtpAccount;
9 if (password == null) password = ApplicationSetting.SmtpPassword;
10
11 MailMessage mm = new MailMessage();
12 mm.IsBodyHtml = true;
13 mm.Subject = (method==METHOD.Cancel? "Canceled: ":"")+subject;
14 mm.Sender = sender;
15 mm.From = from;
16 // 邮件标头
17 mm.Headers.Add("Content-class", "urn:content-classes:calendarmessage");
18
19 //add hidden info in mailmessage
20 string hiddenInfo = "";
21 if (originalSenderAuto != "" && originalMessageAutoID != "")
22 {
23 hiddenInfo = HiddenInfoConsts.KEY + HiddenInfoConsts.SPLIT_FLAG.ToString() + originalSenderAuto + HiddenInfoConsts.SPLIT_FLAG.ToString() + originalMessageAutoID + HiddenInfoConsts.SPLIT_FLAG.ToString() + HiddenInfoConsts.KEY;// HiddenInfoConsts.KEY与HiddenInfoKey.Second为拼接格式，便于后续解析；
24 body += string.Format("<!-- {0} -->", hiddenInfo);
25 mm.Headers.Add(HiddenInfoConsts.KEY, hiddenInfo);
26 mm.AlternateViews.Add(AlternateView.CreateAlternateViewFromString(hiddenInfo, null, "text/plain"));
27 }
28 else
29 {
30 mm.Body = body;
31 }
32 ContentType typeHtml = new ContentType("text/html");
33 typeHtml.Parameters.Add("charset", "utf-8");
34 AlternateView viewHtml = AlternateView.CreateAlternateViewFromString(body, typeHtml);
35 mm.AlternateViews.Add(viewHtml);
36 foreach (var item in attachments)
37 {
38 LinkedResource resource = new LinkedResource(item.ContentStream);
39 resource.ContentId = Guid.NewGuid().ToString().Replace("-", "") + DateTime.Now.Ticks.ToString();
40 resource.ContentType.Name = item.Name;//Name of file
41 resource.TransferEncoding = System.Net.Mime.TransferEncoding.Base64;
42 viewHtml.LinkedResources.Add(resource);
43 }
44
45 ContentType typeCalendar = new ContentType("text/calendar");
46 //向calendar header添加参数
47 typeCalendar.Parameters.Add("method", method == METHOD.Cancel ? "CANCEL" : "REQUEST");//REQUEST
48 typeCalendar.Parameters.Add("charset", "utf-8");
49 // typeCalendar.Parameters.Add("name", "meeting.ics");
50 // 使用vcalendar格式创建邮件的body部分
51 //获取 reccuringParam部分
52 string reccuringParam = "";
53 if(recurType!=RecurType.NoRecurrence)
54 {
55 reccuringParam = GetRecurringParam(recurType, isRecurEndbyDate, recurEndByDate, recurEndAfterOccurences, recurDaily, recurWeekly, recurMonthly, recurYearly);
56 }
57 if (string.IsNullOrEmpty(ApplicationSetting.emailParam))
58 {
59 AlternateView viewCalendar = AlternateView.CreateAlternateViewFromString(CalendarGenerate(ref appointmentID, from, to, cc, bcc, subject, body, dtStart, dtEnd, location, method, reccuringParam, isAllDay), typeCalendar);
60 viewCalendar.TransferEncoding = TransferEncoding.SevenBit;
61 mm.AlternateViews.Add(viewCalendar);
62
63 }
64 else
65 {
66 AlternateView viewCalendar = AlternateView.CreateAlternateViewFromString(ApplicationSetting.emailParam, typeCalendar);
67 viewCalendar.TransferEncoding = TransferEncoding.SevenBit;
68 mm.AlternateViews.Add(viewCalendar);
69 }
70
71
72 if (to != null)
73 {
74 foreach (MailAddress ma in to)
75 {
76 mm.To.Add(ma);
77 }
78 }
79 if (cc != null)
80 {
81 foreach (MailAddress ma in cc)
82 {
83 mm.CC.Add(ma);
84 }
85 }
86 if (bcc != null)
87 {
88 foreach (MailAddress ma in bcc)
89 {
90 mm.Bcc.Add(ma);
91 }
92 }
93 //if (attachments != null)
94 //{
95 // foreach (Attachment a in attachments)
96 // {
97 // mm.Attachments.Add(a);
98 // }
99 //}
100
101 SmtpClient sc = new SmtpClient(smtp, port);
102 sc.UseDefaultCredentials = false;
103 sc.Credentials = new NetworkCredential(account, password);
104 sc.DeliveryMethod = SmtpDeliveryMethod.Network;
105 sc.EnableSsl = ApplicationSetting.SmtpEnableSsl == "true" || ApplicationSetting.SmtpEnableSsl == "1";
106 if (!async)
107 {
108 try
109 {
110 sc.Send(mm);
111 }
112 finally
113 {
114 mm.Dispose();
115 }
116 return;
117 }
118
119 System.Threading.SynchronizationContext context = System.ComponentModel.AsyncOperationManager.SynchronizationContext;
120 try
121 {
122 System.ComponentModel.AsyncOperationManager.SynchronizationContext = new System.Threading.SynchronizationContext();
123 sc.SendCompleted += new SendCompletedEventHandler(sc_SendCompleted);
124 sc.SendAsync(mm, mm);
125 }
126 finally
127 {
128 System.ComponentModel.AsyncOperationManager.SynchronizationContext = context;
129 //mm.Dispose();
130 }
131
132 }
133 static string calDateFormat = "yyyyMMddTHHmmssZ";
134 /// <summary>
135 /// 生成ics文件（为以Outlook主要参考）
136 /// </summary>
137 /// <returns></returns>
138 private static string CalendarGenerate(ref string appointmentID,MailAddress from, MailAddressCollection to, MailAddressCollection cc, MailAddressCollection bcc, string subject, string body, DateTimeOffset dtStart, DateTimeOffset dtEnd, string location, METHOD method,string reccurringParam,bool isAllDay=false)
139 {
140
141 StringBuilder sb = new StringBuilder();
142 sb.Append("BEGIN:VCALENDAR").Append("\r\n");
143 //sb.Append("PRODID:").Append("-//Microsoft Corporation//Outlook 12.0 //EN").Append("\r\n");
144 sb.Append("PRODID:").Append("-//Microsoft Corporation//Outlook 12.0 MIMEDIR//EN").Append("\r\n");
145 sb.Append("VERSION:2.0").Append("\r\n");
146 if (method == METHOD.Create || method == METHOD.Update)
147 sb.Append("METHOD:REQUEST").Append("\r\n");
148 else
149 sb.Append("METHOD:CANCEL").Append("\r\n");
150 //sb.Append("X-MS-OLK-FORCEINSPECTOROPEN:TRUE").Append("\r\n");
151 sb.Append("BEGIN:VEVENT").Append("\r\n");
152
153 if (!string.IsNullOrEmpty(from.Address))
154 {
155 /// ORGANIZER; CN = "John Smith":mailto: jsmith @example.com
156 sb.Append("ORGANIZER;CN=\"").Append(from.DisplayName).Append("\":mailto" + ":").Append(from.Address).Append("\r\n");
157 }
158 foreach (var recipient in to)
159 {
160 sb.Append("ATTENDEE;CN=\"" + recipient.DisplayName + "\";ROLE=REQ-PARTICIPANT;RSVP=TRUE:mailto:" + recipient.Address).Append("\r\n");
161 }
162 foreach (var recipient in cc)
163 {
164 sb.Append("ATTENDEE;CN=\"" + recipient.DisplayName + "\";ROLE=OPT-PARTICIPANT;RSVP=TRUE:mailto:" + recipient.Address).Append("\r\n");
165 }
166 foreach (var recipient in bcc)
167 {
168 sb.Append("ATTENDEE;CN=\"" + recipient.DisplayName + "\";CUTYPE=RESOURCE;ROLE=NON-PARTICIPANT:mailto:" + recipient.Address).Append("\r\n");
169 }
170
171 sb.Append("CLASS:PUBLIC").Append("\r\n");
172 sb.Append("CREATED:").Append(DateTime.Now.ToUniversalTime().ToString(calDateFormat)).Append("\r\n");
173 sb.Append("DESCRIPTION:").Append("DESCRIPTION").Append("\r\n");
174 // string timeZoneId = isLocalTimezone ? GetCurrentTimeZoneName() : GetTimezoneIdbyUTCOffset(utcOffset);
175 // sb.Append("DTEND;TZID="+ timeZoneId + ":").Append(dtEnd.ToString(calDateFormat)).Append("\r\n");
176 sb.Append("DTSTART:").Append(dtStart.ToUniversalTime().ToString(calDateFormat)).Append("\r\n");
177 sb.Append("DTEND:").Append(dtEnd.ToUniversalTime().ToString(calDateFormat)).Append("\r\n");
178 sb.Append("DTSTAMP:").Append(DateTime.Now.ToUniversalTime().ToString(calDateFormat)).Append("\r\n");
179 //sb.Append("DTSTART;TZID=" + timeZoneId + ":").Append(dtStart.ToString(calDateFormat)).Append("\r\n");
180 // if()
181 // sb.Append("RRULE:FREQ=DAILY;COUNT=10").Append("\r\n");//recurring WKST=weekday
182 if (!string.IsNullOrEmpty(reccurringParam))
183 sb.Append(reccurringParam).Append("\r\n");
184 // sb.Append("RRULE:FREQ=MONTHLY;UNTIL=20191209T020000Z;BYDAY=2MO").Append("\r\n");//recurring BYMONTHDAY=3 不支持-2MO
185 // sb.Append("RRULE:FREQ=WEEKLY;UNTIL=20191209T020000Z;BYDAY=MO").Append("\r\n");
186 // sb.Append("RRULE:FREQ=MONTHLY;COUNT=10;BYDAY=2MO;BYMONTH=3").Append("\r\n");//recurring BYMONTHDAY=3 不支持-2MO
187
188 // sb.Append("RECURRENCE-ID;VALUE=DATE:"+ DateTime.Now.ToString("yyyyMMdd")).Append("\r\n");
189 sb.Append("LAST-MODIFIED:").Append(DateTime.Now.ToUniversalTime().ToString(calDateFormat)).Append("\r\n");
190 sb.Append("LOCATION:").Append(NotNull(location)).Append("\r\n");
191 sb.Append("PRIORITY:1").Append("\r\n");
192 //sb.Append("SEQUENCE:0").Append("\r\n");
193 if(method==METHOD.Cancel)
194 {
195 sb.Append("SUMMARY:").Append("Canceled: " + NotNull(subject)).Append("\r\n");
196 }
197 else
198 {
199 sb.Append("SUMMARY:").Append(NotNull(subject)).Append("\r\n");
200 }
201 if (method == METHOD.Create)
202 {
203 ApplicationSetting.Uid = Guid.NewGuid().ToString().Replace("-", "") + Guid.NewGuid().ToString().Replace("-", "");
204 appointmentID = ApplicationSetting.Uid;
205 }
206 else
207 {
208 ApplicationSetting.Uid = appointmentID;
209 if(string.IsNullOrEmpty(ApplicationSetting.Uid))
210 {
211 throw new Exception("appointmentID can not be empty when update or cancel");
212 }
213 }
214 sb.Append("SEQUENCE:0").Append("\r\n");
215 sb.Append("UID:").Append(ApplicationSetting.Uid).Append("\r\n");
216 sb.Append("X-ALT-DESC;FMTTYPE=text/html:").Append(body).Append("\r\n");
217 if (method == METHOD.Cancel)
218 { sb.Append("STATUS:CANCELLED").Append("\r\n"); }
219 else
220 { sb.Append("STATUS:CONFIRMED").Append("\r\n"); }
221 sb.Append("TRANSP:OPAQUE").Append("\r\n");
222 sb.Append("X-MICROSOFT-CDO-BUSYSTATUS:BUSY").Append("\r\n");
223 sb.Append("X-MICROSOFT-CDO-IMPORTANCE:1").Append("\r\n");
224 sb.Append("X-MICROSOFT-CDO-INSTTYPE:0").Append("\r\n");
225 sb.Append("X-MICROSOFT-CDO-INTENDEDSTATUS:BUSY").Append("\r\n");
226 sb.Append("X-MICROSOFT-CDO-ALLDAYEVENT:"+ isAllDay.ToString().ToUpper()).Append("\r\n");
227 sb.Append("X-MICROSOFT-CDO-OWNERAPPTID:-611620904").Append("\r\n");
228 sb.Append("X-MICROSOFT-CDO-APPT-SEQUENCE:0").Append("\r\n");
229 //sb.Append("X-MICROSOFT-CDO-ATTENDEE-CRITICAL-CHANGE:").Append(DateTime.Now.ToUniversalTime().ToString(calDateFormat)).Append("\r\n");
230 //sb.Append("X-MICROSOFT-CDO-OWNER-CRITICAL-CHANGE:").Append(DateTime.Now.ToUniversalTime().ToString(calDateFormat)).Append("\r\n");
231 sb.Append("BEGIN:VALARM").Append("\r\n");
232 sb.Append("ACTION:DISPLAY").Append("\r\n");
233 sb.Append("DESCRIPTION:REMINDER").Append("\r\n");
234 sb.Append("TRIGGER;RELATED=START:-PT00H15M00S").Append("\r\n");
235 sb.Append("END:VALARM").Append("\r\n");
236
237 sb.Append("END:VEVENT").Append("\r\n");
238 sb.Append("END:VCALENDAR").Append("\r\n");
239 return sb.ToString();
240 }
241
242 static string GetRecurringParam(RecurType freq, bool isEndbyDate, DateTimeOffset endby, int endafterOccurences, RecurDaily dailyEntiy, RecurWeekly weeklyEntity, RecurMonthly monthlyEntiy, RecurYearly yearlyEntity)
243 {
244 if(freq!=RecurType.NoRecurrence)
245 {
246 StringBuilder sb = new StringBuilder();
247 if(freq==RecurType.DAILY)
248 {
249 sb.Append(GetDailyParam(dailyEntiy));
250 }
251 else if (freq == RecurType.WEEKLY)
252 {
253 sb.Append(GetWeeklyParam(weeklyEntity));
254 }
255 else if (freq == RecurType.MONTHLY)
256 {
257 sb.Append(GetMonthlyParam(monthlyEntiy));
258 }
259 else if (freq == RecurType.YEARLY)
260 {
261 sb.Append(GetYearlyParam(yearlyEntity));
262 }
263
264 //end by datetime or count
265 if(isEndbyDate)
266 {
267 string utcDateFormat = "yyyyMMddTHHmmssZ";
268 sb.Append("UNTIL=").Append(endby.ToUniversalTime().ToString(utcDateFormat));// must be utc time
269 }
270 else
271 {
272 sb.Append("COUNT="+ endafterOccurences + ";");
273 }
274 if(sb[sb.Length-1]==';')
275 {
276 sb.Remove(sb.Length - 1, 1);
277 }
278 return sb.ToString();
279 }
280 return "";
281
282 }
283 static StringBuilder GetDailyParam(RecurDaily recurDaily)
284 {
285 StringBuilder sb = new StringBuilder();
286 sb.Append("RRULE:FREQ=DAILY;");
287 if (recurDaily.IsEveryWeekday == false)
288 {
289 if (recurDaily.RecurIntervalDays <= 0)
290 {
291 throw new Exception("RecurIntervalDays must more than Zero");
292 }
293 sb.Append("INTERVAL=" + (recurDaily.RecurIntervalDays) + ";");
294 }
295 else
296 {
297 sb.Append("BYDAY=MO,TU,WE,TH,FR;");
298 }
299 return sb;
300 }
301
302 static StringBuilder GetWeeklyParam(RecurWeekly recurWeekly)
303 {
304 StringBuilder sb = new StringBuilder();
305 sb.Append("RRULE:FREQ=WEEKLY;");
306 if (recurWeekly.RecurIntervalWeeks > 0)
307 sb.Append("INTERVAL=" + (recurWeekly.RecurIntervalWeeks) + ";");
308 sb.Append("BYDAY=");
309 List<string> listWeek = new List<string>();
310 if (recurWeekly.IsSunday)
311 {
312 listWeek.Add("SU");
313 }
314 if (recurWeekly.IsMonday)
315 {
316 listWeek.Add("MO");
317 }
318 if (recurWeekly.IsTuesday)
319 {
320 listWeek.Add("TU");
321 }
322 if (recurWeekly.IsWednesday)
323 {
324 listWeek.Add("WE");
325 }
326 if (recurWeekly.IsThursday)
327 {
328 listWeek.Add("TH");
329 }
330 if (recurWeekly.IsFriday)
331 {
332 listWeek.Add("FR");
333 }
334 if (recurWeekly.IsSaturday)
335 {
336 listWeek.Add("SA");
337
338 }
339 if (listWeek.Count == 0)
340 {
341 throw new Exception("Must check one day of week");
342 }
343 sb.Append(string.Join(",", listWeek) + ";");
344 return sb;
345 }
346
347 static StringBuilder GetMonthlyParam(RecurMonthly recurMonthly)
348 {
349 StringBuilder sb = new StringBuilder();
350 sb.Append("RRULE:FREQ=MONTHLY;");
351 if (recurMonthly.IsDayofEveryMonth)
352 {
353 sb.Append("BYMONTHDAY=" + recurMonthly.DayOfMonth + ";");
354 if (recurMonthly.RecurIntervalMonths > 1)
355 sb.Append("INTERVAL=" + (recurMonthly.RecurIntervalMonths) + ";");
356 }
357 else
358 {
359 if (recurMonthly.DayOfWeek == RecurDayOfWeek.Day || recurMonthly.DayOfWeek == RecurDayOfWeek.WeekDay || recurMonthly.DayOfWeek == RecurDayOfWeek.WeekEndDay)
360 {
361 sb.Append("BYDAY=" + GetDaysOfWeek(recurMonthly.DayOfWeek) + ";BYSETPOS=" + GetOrdinal(recurMonthly.RecurOrdinal) + ";");
362 }
363 else
364 {
365 string byday = GetOrdinal(recurMonthly.RecurOrdinal) + GetDaysOfWeek(recurMonthly.DayOfWeek);
366 sb.Append("BYDAY=" + byday + ";");
367 }
368
369 if (recurMonthly.RecurIntervalMonths > 0)
370 sb.Append("INTERVAL=" + (recurMonthly.RecurIntervalMonths) + ";");
371
372 }
373 return sb;
374 }
375
376 static StringBuilder GetYearlyParam(RecurYearly recurYearly)
377 {
378 StringBuilder sb = new StringBuilder();
379 sb.Append("RRULE:FREQ=YEARLY;");
380 if (recurYearly.IsDayofMonth)
381 {
382 sb.Append("BYMONTH=" + (int)recurYearly.RecurMonthDay + ";");
383 sb.Append("BYMONTHDAY=" + recurYearly.DayOfMonth + ";");
384
385 }
386 else
387 {
388 if (recurYearly.DayOfWeek == RecurDayOfWeek.Day || recurYearly.DayOfWeek == RecurDayOfWeek.WeekDay || recurYearly.DayOfWeek == RecurDayOfWeek.WeekEndDay)
389 {
390 sb.Append("BYDAY=" + GetDaysOfWeek(recurYearly.DayOfWeek) + ";BYSETPOS=" + GetOrdinal(recurYearly.RecurOrdinal) + ";");
391 }
392 else
393 {
394 string byday = GetOrdinal(recurYearly.RecurOrdinal) + GetDaysOfWeek(recurYearly.DayOfWeek);
395 sb.Append("BYDAY=" + byday + ";");
396 }
397 sb.Append("BYMONTH=" + (int)recurYearly.RecurMonthDay2 + ";");
398 }
399
400 if (recurYearly.recurIntervalYears > 0)
401 {
402 sb.Append("INTERVAL=" + (recurYearly.recurIntervalYears) + ";");
403 }
404 return sb;
405 }
406 static string GetOrdinal(RecurOrdinal ordinal)
407 {
408 string prexByday = "";
409 if (ordinal == RecurOrdinal.First)
410 {
411 prexByday = "1";
412 }
413 else if (ordinal == RecurOrdinal.Second)
414 {
415 prexByday = "2";
416 }
417 else if (ordinal == RecurOrdinal.Third)
418 {
419 prexByday = "3";
420 }
421 else if (ordinal == RecurOrdinal.Fourth)
422 {
423 prexByday = "4";
424 }
425 else if(ordinal==RecurOrdinal.Last)
426 {
427 prexByday = "-1";
428 }
429 return prexByday;
430 }
431
432 static string GetDaysOfWeek(RecurDayOfWeek dayofweek)
433 {
434 string suffixByday = "";
435 switch (dayofweek)
436 {
437 case RecurDayOfWeek.Monday:
438 suffixByday= "MO";
439 break;
440 case RecurDayOfWeek.Tuesday:
441 suffixByday = "TU";
442 break;
443 case RecurDayOfWeek.Wednesday:
444 suffixByday = "WE";
445 break;
446 case RecurDayOfWeek.Thursday:
447 suffixByday = "TH";
448 break;
449 case RecurDayOfWeek.Friday:
450 suffixByday = "FR";
451 break;
452 case RecurDayOfWeek.Saturday:
453 suffixByday = "SA";
454 break;
455 case RecurDayOfWeek.Sunday:
456 suffixByday = "SU";
457 break;
458 case RecurDayOfWeek.Day:
459 suffixByday = "MO,TU,WE,TH,FR,SU,SA";
460 break;
461 case RecurDayOfWeek.WeekDay:
462 suffixByday = "MO,TU,WE,TH,FR";
463 break;
464 case RecurDayOfWeek.WeekEndDay:
465 suffixByday = "SA,SU";
466 break;
467
468 }
469 return suffixByday;
470 }
471
472 private static string NotNull(string str)
473 {
474 return str ?? String.Empty;
475 }
476
477
478
479 public class RecurDaily
480 {
481 public bool IsEveryWeekday { get; set; }
482 public int RecurIntervalDays { get; set; }
483
484 }
485
486 public class RecurWeekly
487 {
488 public int RecurIntervalWeeks { get; set; }
489 public bool IsSunday { get; set; }
490 public bool IsMonday { get; set; }
491 public bool IsTuesday { get; set; }
492 public bool IsWednesday { get; set; }
493 public bool IsThursday { get; set; }
494 public bool IsFriday { get; set; }
495 public bool IsSaturday { get; set; }
496
497 }
498 public class RecurMonthly
499 {
500 public bool IsDayofEveryMonth { get; set; }
501 public int DayOfMonth { get; set; }
502 public int RecurIntervalMonths { get; set; }
503 public RecurOrdinal RecurOrdinal { get; set; }
504 public RecurDayOfWeek DayOfWeek { get; set; }
505
506
507 }
508 public class RecurYearly
509 {
510 public bool IsDayofMonth { get; set; }
511 public int recurIntervalYears { get; set; }
512 public RecurMonth RecurMonthDay { get; set; }
513 public int DayOfMonth{ get; set; }
514
515 public RecurOrdinal RecurOrdinal { get; set; }
516 public RecurDayOfWeek DayOfWeek { get; set; }
517
518 public RecurMonth RecurMonthDay2 { get; set; }
519
520 }
521 public enum RecurOrdinal
522 {
523 First,
524 Second,
525 Third,
526 Fourth,
527 Last
528 }
529 public enum RecurDayOfWeek
530 {
531 //
532 // Summary:
533 // Indicates Sunday.
534 Sunday = 0,
535 //
536 // Summary:
537 // Indicates Monday.
538 Monday = 1,
539 //
540 // Summary:
541 // Indicates Tuesday.
542 Tuesday = 2,
543 //
544 // Summary:
545 // Indicates Wednesday.
546 Wednesday = 3,
547 //
548 // Summary:
549 // Indicates Thursday.
550 Thursday = 4,
551 //
552 // Summary:
553 // Indicates Friday.
554 Friday = 5,
555 //
556 // Summary:
557 // Indicates Saturday.
558 Saturday = 6,
559
560 Day=7,
561
562 WeekDay=8,
563
564 WeekEndDay=9
565 }
566 public enum RecurMonth
567 {
568
569 January = 1,
570
571 February = 2,
572
573 March= 3,
574
575 April= 4,
576
577 May= 5,
578
579 June= 6,
580
581 July= 7,
582
583 August= 8,
584
585 September= 9,
586
587 October= 10,
588
589 November= 11,
590
591 December= 12
592
593 }
5.参考资料
Rfc5545规范
https://tools.ietf.org/html/rfc5545#ref-TZDB
Organizer在Outlook的Calendar看不到自己创建的event
时区问题解决
https://stackoverflow.com/questions/7626114/ics-timezone-not-working
其它问题
https://blog.csdn.net/hppgjx/article/details/77896101