如何用Exchange WebService获取邮件的附件 (ZT)

小雨点点789

　　I have fallen for exchange web services. There are endless possibilities with exchange web services, and product group is still working to make it even better.
　　Today I have created a neat sample to download attachments off Exchange Server
　　Sample: DownloadAttachments
　　Input Params: itemID , folder
　　public void DownloadAttachments(string itemID,string folder)
　　{
　　ExchangeServiceBinding esb = new ExchangeServiceBinding();
　　esb.AllowAutoRedirect = true;
　　esb.Credentials = new System.Net.NetworkCredential("USERNAME", "PASSWORD", "DOMAIN");
　　esb.Url = "http://your-cas-server/ews/exchange.asmx";
　　//first we need to get the attachment IDs for the item so we will need to make a GetItem call first
　　//specify the conetent that we want to retrieve
　　PathToUnindexedFieldType[] ptufta = new PathToUnindexedFieldType[2];
　　ptufta[0] = new PathToUnindexedFieldType();
　　ptufta[0].FieldURI = UnindexedFieldURIType.itemAttachments;
　　ptufta[1] = new PathToUnindexedFieldType();
　　ptufta[1].FieldURI = UnindexedFieldURIType.itemHasAttachments;
　　ItemResponseShapeType irst = new ItemResponseShapeType();
　　irst.BaseShape = DefaultShapeNamesType.IdOnly;
　　irst.AdditionalProperties = ptufta;
　　ItemIdType[] biita = new ItemIdType[1];
　　biita[0] = new ItemIdType();
　　biita[0].Id = itemID;
　　//get the items
　　GetItemType git = new GetItemType();
　　git.ItemShape = irst;
　　git.ItemIds = biita;
　　GetItemResponseType girt = esb.GetItem(git);
　　if (girt.ResponseMessages.Items[0].ResponseClass != ResponseClassType.Success)
　　return;
　　//now that we have the attachment IDs let's request the atthacments and save them to disk
　　ItemType MsgItem = ((ItemInfoResponseMessageType)girt.ResponseMessages.Items[0]).Items.Items[0];
　　AttachmentResponseShapeType arst = null;
　　AttachmentIdType[] aita = null;
　　if (true == MsgItem.HasAttachments)
　　{
　　//create the attachment shape; we want the mime contnet just in case this is an message item so that we can save to disk
　　arst = new AttachmentResponseShapeType();
　　arst.IncludeMimeContent = true;
　　arst.IncludeMimeContentSpecified = true;
　　//create an array of attachment ids that we want to request
　　aita = new AttachmentIdType[MsgItem.Attachments.Length];
　　for (int i = 0; i < MsgItem.Attachments.Length; i++)
　　{
　　aita = new AttachmentIdType();
　　aita.Id = MsgItem.Attachments.AttachmentId.Id;
　　}
　　}
　　//create a GetAttachment object for the GetAttachment operation
　　GetAttachmentType gat = new GetAttachmentType();
　　gat.AttachmentIds = aita;
　　gat.AttachmentShape = arst;
　　GetAttachmentResponseType gart = esb.GetAttachment(gat);
　　//save each attachment to disk
　　foreach (AttachmentInfoResponseMessageType Attachment in gart.ResponseMessages.Items)
　　{
　　switch (Attachment.Attachments[0].GetType().Name)
　　{
　　//attachments can be of type FileAttachmentType or ItemAttachmentType
　　//so we need to figure out which type we have before we manipulate it
　　case "FileAttachmentType":
　　//save to disk
　　FileAttachmentType TheFileAttachment = (FileAttachmentType)Attachment.Attachments[0];
　　using (Stream FileToDisk = new FileStream(folder + @"\" + Attachment.Attachments[0].Name, FileMode.Create))
　　{
　　FileToDisk.Write(TheFileAttachment.Content, 0,
　　TheFileAttachment.Content.Length);
　　FileToDisk.Flush();
　　FileToDisk.Close();
　　}
　　break;
　　case "ItemAttachmentType":
　　//save to disk
　　ItemType TheItemAttachment = ((ItemAttachmentType)Attachment.Attachments[0]).Item;
　　using (Stream FileToDisk = new FileStream(folder + @".\" + Attachment.Attachments[0].Name + ".eml", FileMode.Create))
　　{
　　byte[] ContentBytes = System.Convert.FromBase64String(TheItemAttachment.MimeContent.Value);
　　FileToDisk.Write(ContentBytes, 0,
　　ContentBytes.Length);
　　FileToDisk.Flush();
　　FileToDisk.Close();
　　}
　　break;
　　default:
　　break;
　　}
　　}
　　}