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Example: Returning a list of attachments using EWS

  • Artikkeli

Here is a sample on getting and returning a list of attachments on an item using Exchange Web Services (EWS).

        //

        //-----------------------------------------------------------------------------------------

        // GetAttachmentsList.

        // Gets a list of file attachemnts on an item and puts them into <FileAttachmentType>.

        // Returns the number of attchments found.

        //

        // Here is how you might call this code:

        // List<FileAttachmentType> attachmentIds = null;

        // string sLines = string.Empty;

        // int iAttachments = 0;

        // iAttachments = GetAttachmentsList(binding, currentCalendarItem.ItemId, ref attachmentIds);

        // Debug.WriteLine(string.Format("{0} Attachments", iAttachments));

        // foreach (FileAttachmentType oFileAttachmentType in attachmentIds)

        // {

        // sLines += " Id: " + oFileAttachmentType.AttachmentId.Id + "\r\n";

        // sLines += " RootItemId: " + oFileAttachmentType.AttachmentId.RootItemId + "\r\n";

        // sLines += " RootItemChangeKey: " + oFileAttachmentType.AttachmentId.RootItemChangeKey + "\r\n";

        // sLines += " ContentId: " + oFileAttachmentType.ContentId + "\r\n";

        // sLines += " ContentLocation: " + oFileAttachmentType.ContentLocation + "\r\n";

        // sLines += " ContentType: " + oFileAttachmentType.ContentType + "\r\n";

        // sLines += " Name: " + oFileAttachmentType.Name + "\r\n";

        // Debug.WriteLine(sLines);

        // }

        //-----------------------------------------------------------------------------------------

        public static int GetAttachmentsList

            (

                ExchangeServiceBinding binding,

                ItemIdType id,

                ref List<FileAttachmentType> attachmentIds

            )

        {

 

  int iAttachmentCount = 0;

            attachmentIds = new List<FileAttachmentType>();

            GetItemType getItemRequest = new GetItemType();

            getItemRequest.ItemIds = new ItemIdType[] { id };

            getItemRequest.ItemShape = new ItemResponseShapeType();

            getItemRequest.ItemShape.BaseShape = DefaultShapeNamesType.AllProperties;

            PathToUnindexedFieldType hasAttachPath = new PathToUnindexedFieldType();

            hasAttachPath.FieldURI = UnindexedFieldURIType.itemHasAttachments;

            PathToUnindexedFieldType attachmentsPath = new PathToUnindexedFieldType();

            attachmentsPath.FieldURI = UnindexedFieldURIType.itemAttachments;

            // Add additional properties...?

 

            //

            getItemRequest.ItemShape.AdditionalProperties = new BasePathToElementType[]{

                 hasAttachPath, attachmentsPath };

 

            GetItemResponseType getItemResponse = binding.GetItem(getItemRequest);

            ItemInfoResponseMessageType getItemResponseMessage = getItemResponse.ResponseMessages.Items[0] as ItemInfoResponseMessageType;

            if (getItemResponseMessage.ResponseCode == ResponseCodeType.NoError)

            {

 

                ItemType item = getItemResponseMessage.Items.Items[0];

                // Never rely on item.HasAttachments - its mostly likely not set as you would think.

                if ((item.Attachments != null) && (item.Attachments.Length > 0))

                    {

 

            for (int attachmentIndex = 0; attachmentIndex < item.Attachments.Length; attachmentIndex++)

                    {

                        // For now, let's only consider file attachments instead of item attachments.

                        //

     FileAttachmentType oFoundAttachment = item.Attachments[attachmentIndex] as FileAttachmentType;

                        if (oFoundAttachment != null)

                        {

                            attachmentIds.Add(oFoundAttachment);

                            //Debug.WriteLine(" Id: " + oFoundAttachment.AttachmentId.Id);

                            iAttachmentCount++;

                        }

                    }

                }

            }

            return iAttachmentCount;

        }

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