HOWTO: EWS: Use GetAttachment to download attachments off Mail/Appointment

 

 

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HOWTO: EWS: Use GetAttachment to download attachments off Mail/Appointment

于 07-10-15 通过 MSDN Blogs 作者：Vikas Verma

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[i] = new AttachmentIdType();

aita[i].Id = MsgItem.Attachments[i].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;

}

}

 

}

 

 

 

 

 

 

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