Office 365 send email with attachment using OutlookServicesClient

Question

I\'m trying to send out some e-mails on behalf of users of my LOB application. I\'m using the Office 365 connected service API so that I can authenticate using OAuth. My c

Answer 1

I was able to figure this out and it seems that the only way to send attachments out in an e-mail in the Office 365 API is to first save the e-mail as a draft, add the attachments, and then send it. Here is my revised SendUsingOutlookClient method

    static async void SendUsingOutlookClient(CommunicationRow me, OutlookServicesClient outlook)
    {
        var m = new Message();
        m.From = ToRecipient(me.From);
        m.Body = new ItemBody { Content = me.Body };
        if (me.IsBodyHtml)
            m.Body.ContentType = BodyType.HTML;
        else
            m.Body.ContentType = BodyType.Text;
        m.Subject = me.Subject;
        m.CcRecipients.Add(me.Cc);
        m.BccRecipients.Add(me.Bcc);
        m.ToRecipients.Add(me.To);
        outlook.Me.Messages.AddMessageAsync(m).Wait();
        foreach (var attach in me.Attachments)
        {
            var file = attach.File;
            var fileversion = file.GetVersion(attach.Version);
            string fullpath = LibraryServiceImpl.GetFullNameInArchive(fileversion);
            var mattach = new FileAttachment { Name = file.Name, ContentId = attach.ContentId, ContentLocation = fullpath, ContentType = GraphicUtils.DetermineMime(Path.GetExtension(fullpath)) };
            if (file.Name.MissingText())
                mattach.Name = attach.ContentId + fileversion.FileExtension;
            m.Attachments.Add(mattach);
            await m.UpdateAsync();
        }
        await m.SendAsync();
    }