Sends data to a connected System.Net.Sockets.Socket using the specified System.Net.Sockets.SocketFlags.
Syntax
Parameters
- buf
- Documentation for this section has not yet been entered.
- flags
- Documentation for this section has not yet been entered.
Returns
The number of bytes sent to the System.Net.Sockets.Socket.
Exceptions
Type Reason ArgumentNullException buffer is null. InvalidOperationException An asynchronous call is pending and a blocking method has been called. System.Net.Sockets.SocketException socketFlags is not a valid combination of values.
-or-
An error occurred while accessing the socket.
Note: For additional information on causes of the SocketException, see the System.Net.Sockets.SocketException class.ObjectDisposedException The current instance has been disposed.
Remarks
Socket.Send(Byte[], int, SocketFlags) synchronously sends data to the remote host established in the Socket.Connect(System.Net.EndPoint) or Socket.Accept method and returns the number of bytes successfully sent. The Socket.Send(Byte[], int, SocketFlags) method can be used for both connection-oriented and connectionless protocols.
This overload requires a buffer that contains the data you want to send and a bitwise combination of System.Net.Sockets.SocketFlags. The buffer offset defaults to 0, and the number of bytes to send defaults to the size of the buffer. If you specify the SocketFlags.DontRoute flag as the socketflags parameter value, the data you are sending will not be routed.
If you are using a connectionless protocol, you must call Socket.Connect(System.Net.EndPoint) before calling this method, or Socket.Send(Byte[], int, SocketFlags) will throw a System.Net.Sockets.SocketException. If you are using a connection-oriented protocol, you must either use Socket.Connect(System.Net.EndPoint) to establish a remote host connection, or use Socket.Accept to accept an incoming connection.
If you are using a connectionless protocol and plan to send data to several different hosts, you should use the Socket.SendTo(Byte[], int, int, SocketFlags, System.Net.EndPoint) method. If you do not use the Socket.SendTo(Byte[], int, int, SocketFlags, System.Net.EndPoint) method, you will have to call the Socket.Connect(System.Net.EndPoint) method before each call to Socket.Send(Byte[], int, SocketFlags). You can use Socket.SendTo(Byte[], int, int, SocketFlags, System.Net.EndPoint) even after you have established a default remote host with Socket.Connect(System.Net.EndPoint). You can also change the default remote host prior to calling Socket.Send(Byte[], int, SocketFlags) by making another call to Socket.Connect(System.Net.EndPoint).
If you are using a connection-oriented protocol, Socket.Send(Byte[], int, SocketFlags) will block until all of the bytes in the buffer are sent, unless a time-out was set by using Socket.SendTimeout. If the time-out value was exceeded, the Socket.Send(Byte[], int, SocketFlags) call will throw a System.Net.Sockets.SocketException. In nonblocking mode, Socket.Send(Byte[], int, SocketFlags) may complete successfully even if it sends less than the number of bytes in the buffer. It is your application's responsibility to keep track of the number of bytes sent and to retry the operation until the application sends the requested number of bytes. There is also no guarantee that the data you send will appear on the network immediately. To increase network efficiency, the underlying system may delay transmission until a significant amount of outgoing data is collected. A successful completion of the Socket.Send(Byte[], int, SocketFlags) method means that the underlying system has had room to buffer your data for a network send.
You must ensure that the size of your buffer does not exceed the maximum packet size of the underlying service provider. If it does, the datagram will not be sent and Socket.Send(Byte[], int, SocketFlags) will throw a System.Net.Sockets.SocketException. If you receive a System.Net.Sockets.SocketException, use the SocketException.ErrorCode property to obtain the specific error code. After you have obtained this code, refer to the Windows Sockets version 2 API error code documentation in the MSDN library for a detailed description of the error.
The successful completion of a send does not indicate that the data was successfully delivered. If no buffer space is available within the transport system to hold the data to be transmitted, send will block unless the socket has been placed in nonblocking mode.
This member outputs trace information when you enable network tracing in your application. For more information, see [<topic://conUsingNetworkTracing>].
Requirements
Assembly: System (in System.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0, 4.0.0.0