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Example: Populate a ListView with a list of attachments using EWS

  • Artikkeli

I thought it would be fun to blog another sample of getting a list of attachments using EWS. So, here is a handly method for populating a list of attachments.

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

    // GetFileAttachmentsListLv

    // Sets a listview to the attachments on an item.

    // Returns number of attachments.

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

    public static int GetFileAttachmentsListLv(ExchangeServiceBinding binding, ItemIdType id, ref ListView oListView)

    {

        int iAttachmentCount = 0;

     //List<RequestAttachmentIdType> attachmentIds = new List<RequestAttachmentIdType>();

        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;

        oListView.Clear();

        oListView.View = View.Details; // Set the view to show details.

        oListView.GridLines = true; // Display grid lines.

        oListView.Columns.Add("Name", 90, HorizontalAlignment.Left);

        oListView.Columns.Add("Id", 120, HorizontalAlignment.Left);

        oListView.Columns.Add("RootItemId", 120, HorizontalAlignment.Left);

        oListView.Columns.Add("RootItemChangeKey", 120, HorizontalAlignment.Left);

  oListView.Columns.Add("ContentType", 80, HorizontalAlignment.Left);

        oListView.Columns.Add("ContentId", 80, HorizontalAlignment.Left);

        oListView.Columns.Add("ContentLocation", 80, HorizontalAlignment.Left);

        if (getItemResponseMessage.ResponseCode == ResponseCodeType.NoError)

        {

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

            // dont 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 almostAnAttachment = item.Attachments[attachmentIndex] as FileAttachmentType;

                    if (almostAnAttachment != null)

                    {

                    // Note: Use GetAttachment to get the actual attachment.

                        RequestAttachmentIdType requestId = new RequestAttachmentIdType();

                        requestId.Id = almostAnAttachment.AttachmentId.Id;

                        ListViewItem lvItem = new ListViewItem(String.Format("{0}", almostAnAttachment.Name));

                        lvItem.SubItems.Add(String.Format("{0}", almostAnAttachment.AttachmentId.Id));

                        lvItem.SubItems.Add(String.Format("{0}", almostAnAttachment.AttachmentId.RootItemId));

                        lvItem.SubItems.Add(String.Format("{0}", almostAnAttachment.AttachmentId.RootItemChangeKey));

                        lvItem.SubItems.Add(String.Format("{0}", almostAnAttachment.ContentId));

                        lvItem.SubItems.Add(String.Format("{0}", almostAnAttachment.ContentLocation));

                        lvItem.SubItems.Add(String.Format("{0}", almostAnAttachment.ContentType));

                        oListView.Items.Add(lvItem);

                        lvItem = null;

                        iAttachmentCount++;

                    }

                }

            }

        }

        return iAttachmentCount;

    }

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