Downloading Attachments Using Exchange Web Service

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I want to download/ access attachment from particular mailbox. I am trying to do using following code however I am not getting any attachment. (may be because AttachmentID's are not proper)

C#

ExchangeServiceBinding esb = new ExchangeServiceBinding();
   esb.RequestServerVersionValue = new RequestServerVersion();
  esb.RequestServerVersionValue.Version = ExchangeVersionType.Exchange2007_SP1;
  esb.Credentials = new NetworkCredential("<user_id>", "<password>", "<domain>");
  esb.Url = @"https://<server_fqdn>/ews/Exchange.asmx";

  GetAttachmentType request = new GetAttachmentType();

  // Create the response shape.
  AttachmentResponseShapeType responseShape = new AttachmentResponseShapeType();
  responseShape.BodyType = BodyTypeResponseType.Best;
  responseShape.BodyTypeSpecified = true;

  // Add the response shape to the request.
  request.AttachmentShape = responseShape;

  // Identify the attachment IDs to get.
  RequestAttachmentIdType[] ids = new RequestAttachmentIdType[2];
  ids[0] = new RequestAttachmentIdType();
  ids[1] = new RequestAttachmentIdType();
  ids[0].Id = "AAAlAE1BQG1";
  ids[1].Id = "AAAlAE1Bas";

  //// Add the attachment IDs to the request.
  request.AttachmentIds = ids;

  GetAttachmentResponseType response = esb.GetAttachment(request);
  ResponseMessageType[] rmta = response.ResponseMessages.Items;</server_fqdn></domain></password></user_id>

I don't know what exactly Attachment ID is and I need to process all attachment , So how do I know which ID to specify?

Posted 31-Aug-11 11:02am

Pradip_Bobhate

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Ganesan Senthilvel · Answer 1 · 2011-08-31T18:49:00

A succesful ExchangeService message has the below format:

XML

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/"
               xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
               xmlns:xsd="http://www.w3.org/2001/XMLSchema">
  <soap:Header>
    <t:ServerVersionInfo MajorVersion="8" MinorVersion="0" MajorBuildNumber="595" MinorBuildNumber="0"
                         xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types" />
  </soap:Header>
  <soap:Body>
    <FindItemResponse xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages"
                      xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types"
                      xmlns="http://schemas.microsoft.com/exchange/services/2006/messages">
      <m:ResponseMessages>
        <m:FindItemResponseMessage ResponseClass="Success">
          <m:ResponseCode>NoError</m:ResponseCode>
          <m:RootFolder TotalItemsInView="10" IncludesLastItemInRange="true">
            <t:Items>
              <t:Message>
                <t:ItemId Id="AS4AUn=" ChangeKey="fsVU4==" />
              </t:Message>
              <t:Message>
                <t:ItemId Id="AS4AUM=" ChangeKey="fsVUA==" />
              </t:Message>
            </t:Items>
          </m:RootFolder>
        </m:FindItemResponseMessage>
      </m:ResponseMessages>
    </FindItemResponse>
  </soap:Body>
</soap:Envelope>

To extract the attachement, FindItemResponseMessageType class from ews.dll plays the major role.

ExchangeServiceBinding esb = new ExchangeServiceBinding();
   esb.RequestServerVersionValue = new RequestServerVersion();
  esb.RequestServerVersionValue.Version = ExchangeVersionType.Exchange2007_SP1;
  esb.Credentials = new NetworkCredential("<user_id>", "<password>", "<domain>");
  esb.Url = @"https://<server_fqdn>/ews/Exchange.asmx";

..........

        FindItemResponseType findItemResponse = esb.FindItem(findItemRequest);

	foreach(ResponseMessageType responseMessage in findItemResponse.ResponseMessages)
	{
          if (responseMessage is FindItemResponseMessageType)
          {
            FindItemResponseMessageType firmt = (responseMessage as FindItemResponseMessageType);
            FindItemParentType fipt = firmt.RootFolder;
            object obj = fipt.Item;

            // Determine whether the FindItem response contains grouped items.
            if (obj is ArrayOfGroupedItemsType)
            {
                ArrayOfGroupedItemsType groupedItems = (obj as ArrayOfGroupedItemsType);
                //TODO: Write code to handle grouped items.
            }

            // FindItem contains an array of items.
            else if (obj is ArrayOfRealItemsType)
            {
                ArrayOfRealItemsType items = (obj as ArrayOfRealItemsType);
                //TODO: Write code to handle items.
            }
          }