TransferEncoding Enumeration
Specifies the Content-Transfer-Encoding header information for an e-mail message attachment.
Assembly: System (in System.dll)
| Member name | Description | |
|---|---|---|
| Base64 | Encodes stream-based data. See RFC 2406 Section 6.8. | |
| 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. | |
| QuotedPrintable | Encodes data that consists of printable characters in the US-ASCII character set. See RFC 2406 Section 6.7. | |
| 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. | |
| 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.
static void DisplayStreamAttachment( Attachment^ a ) { Stream^ s = a->ContentStream; StreamReader^ reader = gcnew StreamReader( s ); Console::WriteLine( L"Content: {0}", reader->ReadToEnd() ); Console::WriteLine( L"Content Type {0}", a->ContentType ); Console::WriteLine( L"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 = nullptr; }
Available since 2.0