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AttachmentCollection Class

Note: This class is new in the .NET Framework version 2.0.

Stores attachments to be sent as part of an e-mail message.

Namespace: System.Net.Mail
Assembly: System (in system.dll)

public sealed class AttachmentCollection : Collection<Attachment>, IDisposable
public final class AttachmentCollection extends Collection<Attachment> implements IDisposable
public final class AttachmentCollection extends Collection<Attachment> implements IDisposable

Instances of the AttachmentCollection class are returned by the MailMessage.AlternateViews and MailMessage.Attachments properties.

Use the AlternateViews property to specify copies of an e-mail message in different formats. For example, if you send a message in HTML, you might also want provide a plain text version in case some of the recipients use e-mail readers that cannot display HTML content.

Use the collection returned by the Attachments property to add an attachment, such as a file or the contents of a Stream to this MailMessage.

The following code example demonstrates how to create and send an e-mail message with an attachment.

public static void CreateMessageWithAttachment(string server)
{
    // Specify the file to be attached and sent.
    // This example assumes that a file named Data.xls exists in the
    // current working directory.
    string file = "data.xls";
    // Create a message and set up the recipients.
    MailMessage message = new MailMessage(
       "jane@contoso.com",
       "ben@contoso.com",
       "Quarterly data report.",
       "See the attached spreadsheet.");

    // Create  the file attachment for this e-mail message.
    Attachment data = new Attachment(file, MediaTypeNames.Application.Octet);
    // Add time stamp information for the file.
    ContentDisposition disposition = data.ContentDisposition;
    disposition.CreationDate = System.IO.File.GetCreationTime(file);
    disposition.ModificationDate = System.IO.File.GetLastWriteTime(file);
    disposition.ReadDate = System.IO.File.GetLastAccessTime(file);
    // Add the file attachment to this e-mail message.
    message.Attachments.Add(data);
    //Send the message.
    SmtpClient client = new SmtpClient(server);
    // Add credentials if the SMTP server requires them.
    client.Credentials = CredentialCache.DefaultNetworkCredentials;
    client.Send(message);
    // Display the values in the ContentDisposition for the attachment.
    ContentDisposition cd = data.ContentDisposition;
    Console.WriteLine("Content disposition");
    Console.WriteLine(cd.ToString());
    Console.WriteLine("File {0}", cd.FileName);
    Console.WriteLine("Size {0}", cd.Size);
    Console.WriteLine("Creation {0}", cd.CreationDate);
    Console.WriteLine("Modification {0}", cd.ModificationDate);
    Console.WriteLine("Read {0}", cd.ReadDate);
    Console.WriteLine("Inline {0}", cd.Inline);
    Console.WriteLine("Parameters: {0}", cd.Parameters.Count);
    foreach (DictionaryEntry d in cd.Parameters)
    {
        Console.WriteLine("{0} = {1}", d.Key, d.Value);
    }
    data.Dispose();
}

System.Object
   System.Collections.ObjectModel.Collection
    System.Net.Mail.AttachmentCollection

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

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0

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