TransferEncoding Enumeration
Specifies the Content-Transfer-Encoding header information for an e-mail message attachment.
Namespace: System.Net.Mime
Assembly: System (in System.dll)
| Member name | Description | |
|---|---|---|
| QuotedPrintable | Encodes data that consists of printable characters in the US-ASCII character set. See RFC 2406 Section 6.7. | |
| Base64 | Encodes stream-based data. See RFC 2406 Section 6.8. | |
| SevenBit | Used for data that is not encoded. The data is in 7-bit US-ASCII characters with a total line length of no longer than 1000 characters. See RFC2406 Section 2.7. | |
| EightBit | The data is in 8-bit characters that may represent international characters with a total line length of no longer than 1000 8-bit characters. For more information about this 8-bit MIME transport extension, see IETF RFC 6152. | |
| Unknown | Indicates that the transfer encoding is unknown. |
The values in the TransferEncoding enumeration are used with the AttachmentBase.TransferEncoding property.
The Content-Transfer-Encoding header specifies the encoding of the associated message body so that it meets SMTP requirements. SMTP requires data for transport to be in 7-bit US-ASCII characters with lines no longer than 1000 characters.
Content-Transfer-Encoding values are described in detail in RFC 2045 Section 6, available at http://www.ietf.org.
The following code example displays TransferEncoding used by an attachment.
public static void DisplayStreamAttachment(Attachment a) { Stream s = a.ContentStream; StreamReader reader = new StreamReader(s); Console.WriteLine("Content: {0}", reader.ReadToEnd()); Console.WriteLine("Content Type {0}", a.ContentType.ToString()); Console.WriteLine("Transfer Encoding {0}", a.TransferEncoding); // Note that you cannot close the reader before the e-mail is sent. // Closing the reader before sending the e-mail will close the // ContentStream and cause an SmtpException. reader = null; }
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
