The enumeration defines values used in file transfer requests.
This enumeration has a FlagsAttribute attribute that allows a bitwise combination of its member values.Namespace: System.Net.Sockets
Assembly: System (in System.dll)
|Use the default thread to process long file transfer requests.|
|Start a transport-level disconnect after all the file data has been queued for transmission. When used with , these flags return the socket to a disconnected, reusable state after the file has been transmitted.|
|The socket handle may be reused when the request completes. This flag is valid only if is also specified. When used with , these flags return the socket to a disconnected, reusable state after the file has been transmitted.|
|Complete the file transfer request immediately, without pending. If this flag is specified and the file transfer succeeds, the data has been accepted by the system but not necessarily acknowledged by the remote end. Do not use this flag with the and flags.|
|Use system threads to process long file transfer requests.|
|Use kernel asynchronous procedure calls (APCs) instead of worker threads to process long file transfer requests. Long requests are defined as requests that require more than a single read from the file or a cache; the request therefore depends on the size of the file and the specified length of the send packet.|
Note The flags and return the socket to a disconnected, reusable state after the file has been transmitted. These flags should not be used on a socket where quality of service (QOS) has been requested, because the service provider might immediately delete any quality of service associated with the socket before the file transfer has completed. The best approach for a QOS-enabled socket is to call Close when the file transfer has completed, rather than relying on these flags.
The following example demonstrates the use of in a call to SendFile. The file "test.txt" is located in the root directory of the local machine. In this example, a prebuffer and postbuffer of data are created and sent to the remote host with the file. To use the system's default thread, is specified.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.