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AttachmentType Class

The AttachmentType class represents an attachment.

Namespace:  ExchangeWebServices
Assembly:  EWS (in EWS.dll)

<SerializableAttribute> _
Public Class AttachmentType
Dim instance As AttachmentType

The AttachmentType class can represent either a file or an item attachment. The AttachmentType class is the base type for the FileAttachmentType and the ItemAttachmentType classes.

The following example shows you the use of the FileAttachmentType and the ItemAttachmentType. Both of these types are derived from the AttachmentType class. These two types are added to the Attachments property of the CreateAttachmentType class. This example also shows you the use of the AttachmentType in the AttachmentInfoResponseMessageType object.

static void CreateAttachment(ExchangeServiceBinding esb)
    // Create item attachment.
    MessageType message = new MessageType();
    message.Subject = "Example subject";
    message.Importance = ImportanceChoicesType.Low;
    message.ImportanceSpecified = true;

    ItemAttachmentType itemAttach = new ItemAttachmentType();
    itemAttach.Name = "Message Attachment Example";
    itemAttach.Item = message;

    // Create file attachment.
    FileAttachmentType fileAttach = new FileAttachmentType();
    fileAttach.Name = "filename.txt";
    fileAttach.ContentType = "text/plain";

    byte[] content;
    using (FileStream fileStream = new FileStream("C:\\cas.txt",
        FileMode.Open, FileAccess.Read))
        content = new byte[fileStream.Length];
        fileStream.Read(content, 0, content.Length);

    fileAttach.Content = content;

    // Create the CreateAttachment request.
    CreateAttachmentTypereqCreateAttach = new CreateAttachmentType();

    // Identify the item that will have the attachments.
    ItemIdType item = new ItemIdType();
    item.Id = "AAAlAE1BQG1h";
    item.ChangeKey = "DwAAABYAAA"; 
    // Add the parent item to the request.
    reqCreateAttach.ParentItemId = item;

    // Add attachments to the request.
    reqCreateAttach.Attachments = new AttachmentType[2];
    reqCreateAttach.Attachments[0] = itemAttach;
    reqCreateAttach.Attachments[1] = fileAttach;

        CreateAttachmentResponseType resp = esb.CreateAttachment(reqCreateAttach);
        ArrayOfResponseMessagesType aorit = resp.ResponseMessages;
        ResponseMessageType[] rmta = aorit.Items;

        foreach (ResponseMessageType rmt in rmta)
            if (rmt.ResponseClass == ResponseClassType.Success)
                AttachmentInfoResponseMessageType airmt = rmt as AttachmentInfoResponseMessageType;
                foreach (AttachmentType atch in airmt.Attachments)
                    if (atch is ItemAttachmentType)
                        Console.WriteLine("Created item attachment");
                    else if (atch is FileAttachmentType)
                        Console.WriteLine("Created file attachment");
                        throw new Exception("Unknown attachment");
    catch (Exception e)

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.