使用 Exchange Web 服务发送电子邮件时出现 System.InvalidOperationException

Question

I'm trying to send a reply email using Exchange WebService and got blocked with the below exception.

System.InvalidOperationException
  HResult=0x80131509
  Message=This operation can't be performed because this service object already has an ID. To update this service object, use the Update() method instead.
  Source=Microsoft.Exchange.WebServices
  StackTrace:
   at Microsoft.Exchange.WebServices.Data.ServiceObject.ThrowIfThisIsNotNew()
   at Microsoft.Exchange.WebServices.Data.Item.InternalCreate(FolderId parentFolderId, Nullable`1 messageDisposition, Nullable`1 sendInvitationsMode)
   at Microsoft.Exchange.WebServices.Data.Item.Save(FolderId parentFolderId)
   at DataLoadLibrary.DataLoad.Email.EWSOAuthAdapter.genericEmail(String recepient, String subject, String bodyMessage, Dictionary`2 replacementStrings, String cc, String bcc, String headerMessage, String footerMessage, FileInfo[] attachments, String[] filenames, EmailMessage originalEmail, ExchangeService exchangeClient) in C:\Path\DataLoadLibrary\DataLoad\Email\EWSOAuthAdapter.cs:line 95
   at DataLoadLibrary.DataLoad.Email.OAuthBasedTestPortRequest.startDataload() in C:\Path\DataLoadLibrary\DataLoad\Email\OAuthBasedTestPortRequest.cs:line 132
   at TestPortEmailReader.Program.<Main>d__8.MoveNext() in C:\Path\TestPortEmailReader\Program.cs:line 93

  This exception was originally thrown at this call stack:
    [External Code]
    DataLoadLibrary.DataLoad.Email.EWSOAuthAdapter.genericEmail(string, string, string, System.Collections.Generic.Dictionary<string, string>, string, string, string, string, System.IO.FileInfo[], string[], Microsoft.Exchange.WebServices.Data.EmailMessage, Microsoft.Exchange.WebServices.Data.ExchangeService) in EWSOAuthAdapter.cs
    DataLoadLibrary.DataLoad.Email.OAuthBasedTestPortRequest.startDataload() in OAuthBasedTestPortRequest.cs
    TestPortEmailReader.Program.Main(string[]) in Program.cs

#Implementation

 public bool genericEmail(
                                string recepient,
                                string subject,
                                string bodyMessage,
                                Dictionary<string, string> replacementStrings = null,
                                string cc = "",
                                string bcc = "",
                                string headerMessage = "",
                                string footerMessage = "",
                                FileInfo[] attachments = null,
                                string[] filenames = null,
                                EmailMessage originalEmail = null,
                                ExchangeService exchangeClient = null)
        {

            
            EmailMessage email = EmailMessage.Bind(exchangeClient, originalEmail.Id, PropertySet.FirstClassProperties);
         
            //exchangeClient.LoadPropertiesForItems((IEnumerable<Item>)email, PropertySet.FirstClassProperties);

            email.Sender.Address = config.exchangeUsername + "@domain.com";
            email.Sender.Name = "ABC";
            if (recepient.Length == 0)
            {
                email.ToRecipients.Add(iPACTTeamEmail);
            }
            else
            {
                email.ToRecipients.Add(recepient.TrimEnd(';'));
            }
            if (cc.Length != 0)
                email.CcRecipients.Add(cc.TrimEnd(';'));
            if (config.environment != "PR")
            {
                email.Sender.Address = config.exchangeUsername + "@domain.com";
                email.CcRecipients.Add(null);
            }

            if (attachments != null)
            {
                int i = 0;
                foreach (FileInfo fi in attachments)
                {
                    FileStream theStream = new FileStream(fi.FullName, FileMode.OpenOrCreate);
                    if (filenames == null)
                        email.Attachments.AddFileAttachment(fi.Name, theStream);
                    else
                        email.Attachments.AddFileAttachment(filenames[i], theStream);
                    i++;
                }
            }

            if (originalEmail != null)
            {
                string originalEmailFilename = config.extractFolder + "\\Emails" + originalEmail.Subject.Trim().Replace('\\', '_').Replace('/', '_').Replace(":", "_").Replace("\"", "_").Replace("*", "_").Replace("?", "_").Replace("<", "_").Replace(">", "_").Replace("|", "_") + "_" + originalEmail.DateTimeReceived.ToString("yyyyMMdd_HHmmss") + ".msg";
                originalEmail.Save(originalEmailFilename); //Getting above exception here
                email.Attachments.AddFileAttachment(originalEmailFilename);

            }

            if (config.environment == "PR")
                email.Subject = subject.Trim();
            else
                email.Subject = "[" + config.environment + "] " + subject.Trim();

            if (replacementStrings != null)
            {
                foreach (KeyValuePair<string, string> kv in replacementStrings)
                {
                    bodyMessage = bodyMessage.Replace(kv.Key, kv.Value);
                }
            }

            bodyMessage = bodyMessage.Replace("{headerMessage}", headerMessage);
            bodyMessage = bodyMessage.Replace("{footerMessage}", footerMessage);

            email.Body = new MessageBody(BodyType.HTML, bodyMessage);
            email.Send();

            return true;
        }

Even after binding the mail id am getting the same exception when saving the original email. Is it because am trying to save it multiple times. I went through this one https://social.msdn.microsoft.com/Forums/exchange/en-US/4beb7588-f851-4c7d-b060-f46ae2642e61/get-email-message-after-send-it-with-exchange-library?forum=exchangesvrdevelopment but didn't get a proper solution. Kindly help me to identify what is missing in my implementation

Answer 1

            string originalEmailFilename = config.extractFolder + "\\Emails" + originalEmail.Subject.Trim().Replace('\\', '_').Replace('/', '_').Replace(":", "_").Replace("\"", "_").Replace("*", "_").Replace("?", "_").Replace("<", "_").Replace(">", "_").Replace("|", "_") + "_" + originalEmail.DateTimeReceived.ToString("yyyyMMdd_HHmmss") + ".msg";
            originalEmail.Save(originalEmailFilename); //

You can't do this in the EWS Managed API as it doesn't support saving a Message to a file, also if you want an Msg file then EWS won't work for that at all this is an Office file format (compound ole file https://docs.microsoft.com/en-us/cpp/mfc/containers-compound-files?view=msvc-170 ). You can save a Message as an Eml file using Mime Stream as documented in https://docs.microsoft.com/en-us/exchange/client-developer/exchange-web-services/how-to-export-items-by-using-ews-in-exchange