如何像 Outlook 在 .NET 中一样发送 iCalendar

Question

目前，我可以使用 MailKit 发送带有 ics 文件作为附件的电子邮件，该 ics 文件是使用 iCal.net 创建的。这可行，但我只能将其视为附件。当我在 Outlook 中手动创建约会时，我会得到精美的 UI。

当我以编程方式创建它时，我会得到它。

我想以编程方式创建精美的 UI。它似乎与 ICS 无关，因为我通过 Outlook 手动创建了一个 ICS 文件。并使用该 ics 文件通过我的应用程序发送，但仍然没有成功。

static void Main(string[] args)
    {
        string serializedCalendar = CreateRecurringEvent();
        File.WriteAllText(@"F:\test.ics", serializedCalendar);
        SendMail();
    }

    private static void SendMail()
    {
        var message = new MimeMessage();
        message.From.Add(new MailboxAddress("Joey Tribbiani", "joey@tribbiani.com"));
        message.To.Add(new MailboxAddress("Monica Geller", "monica@geller.com"));
        message.To.Add(new MailboxAddress("Chandler Muriel Bing", "chandler@murielbing.com"));
        message.Subject = "How you doin?";

        var builder = new BodyBuilder
        {
            TextBody = @"<bodytext>"
        };

        builder.Attachments.Add(@"F:\test.ics");
        message.Body = builder.ToMessageBody();

        using (var client = new SmtpClient())
        {
            client.ServerCertificateValidationCallback = (s, c, h, e) => true;
            client.Connect("<host>", 235236);
            client.Authenticate("<username>", "<password>");
            client.Send(message);
            client.Disconnect(true);
        }
    }

    private static string CreateRecurringEvent()
    {
        DateTime now = DateTime.Now;
        DateTime later = now.AddHours(1);
        var rrule = new RecurrencePattern(FrequencyType.Daily, 1) { Count = 5 };

        var e = new CalendarEvent
        {
            Start = new CalDateTime(now),
            End = new CalDateTime(later),
            RecurrenceRules = new List<RecurrencePattern> { rrule }
        };

        var calendar = new Calendar();
        calendar.Events.Add(e);

        var serializer = new CalendarSerializer();
        return serializer.SerializeToString(calendar);
    }
}

Answer 1

以下是创建适用于 Outlook 的会议请求的方法：

var message = new MimeMessage();
message.From.Add(new MailboxAddress("Joey Tribbiani", "joey@tribbiani.com"));
message.To.Add(new MailboxAddress("Monica Geller", "monica@geller.com"));
message.To.Add(new MailboxAddress("Chandler Muriel Bing", "chandler@murielbing.com"));
message.Subject = "How you doin?";

var mixed = new Multipart ("mixed");
mixed.Add (new TextPart ("plain") {
    ContentTransferEncoding = ContentEncoding.QuotedPrintable,
    Text = "Would you like to join this meeting?"
});

var ical = new TextPart ("calendar") {
    ContentTransferEncoding = ContentEncoding.Base64,
    Text = CreateRecurringEvent (),
};

ical.ContentType.Parameters.Add ("method", "REQUEST");

mixed.Add (ical);

message.Body = mixed;