System.Net.Sockets Namespace

The System.Net.Sockets namespace provides a managed implementation of the Windows Sockets (Winsock) interface for developers who need to tightly control access to the network.

Classes

HttpPolicyDownloaderProtocol

Downloads the policy file that an instance of the Socket class will use.

IPv6MulticastOption

Contains option values for joining an IPv6 multicast group.

LingerOption

Specifies whether a Socket will remain connected after a call to the Close() or Close() methods and the length of time it will remain connected, if data remains to be sent.

MulticastOption

Contains IPAddress values used to join and drop multicast groups.

NetworkStream

Provides the underlying stream of data for network access.

SendPacketsElement

Represents an element in a SendPacketsElement array.

Socket

Implements the Berkeley sockets interface.

SocketAsyncEventArgs

Represents an asynchronous socket operation.

SocketException

The exception that is thrown when a socket error occurs.

SocketPolicy

Represents a policy file instance.

SocketTaskExtensions

This class contains extension methods to the Socket class.

TcpClient

Provides client connections for TCP network services.

TcpListener

Listens for connections from TCP network clients.

UdpAnySourceMulticastClient

A client receiver for multicast traffic from any source, also known as Any Source Multicast (ASM) or Internet Standard Multicast (ISM).

UdpClient

Provides User Datagram Protocol (UDP) network services.

UdpSingleSourceMulticastClient

A client receiver for multicast traffic from a single source, also known as Source Specific Multicast (SSM).

UnixDomainSocketEndPoint

Structs

IPPacketInformation

Presents the packet information from a call to ReceiveMessageFrom(Byte[], Int32, Int32, SocketFlags, EndPoint, IPPacketInformation) or EndReceiveMessageFrom(IAsyncResult, SocketFlags, EndPoint, IPPacketInformation).

SocketInformation

Encapsulates the information that is necessary to duplicate a Socket.

SocketReceiveFromResult

The result of a ReceiveFromAsync(Socket, ArraySegment<Byte>, SocketFlags, EndPoint) operation.

SocketReceiveMessageFromResult

The result of a ReceiveMessageFromAsync(Socket, ArraySegment<Byte>, SocketFlags, EndPoint) operation.

UdpReceiveResult

Presents UDP receive result information from a call to the ReceiveAsync() method.

Enums

AddressFamily

Specifies the addressing scheme that an instance of the Socket class can use.

IOControlCode

Specifies the IO control codes supported by the IOControl(Int32, Byte[], Byte[]) method.

IPProtectionLevel

A value that enables restriction of an IPv6 socket to a specified scope, such as addresses with the same link local or site local prefix.

ProtocolFamily

Specifies the type of protocol that an instance of the Socket class can use.

ProtocolType

Specifies the protocols that the Socket class supports.

SelectMode

Defines the polling modes for the Poll(Int32, SelectMode) method.

SocketAsyncOperation

The type of asynchronous socket operation most recently performed with this context object.

SocketClientAccessPolicyProtocol

Specifies the method to download a client access policy file.

SocketError

Defines error codes for the Socket class.

SocketFlags

Specifies socket send and receive behaviors.

SocketInformationOptions

Describes states for a Socket.

SocketOptionLevel

Defines socket option levels for the SetSocketOption(SocketOptionLevel, SocketOptionName, Int32) and GetSocketOption(SocketOptionLevel, SocketOptionName) methods.

SocketOptionName

Defines configuration option names.

SocketShutdown

Defines constants that are used by the Shutdown(SocketShutdown) method.

SocketType

Specifies the type of socket that an instance of the Socket class represents.

TransmitFileOptions

The TransmitFileOptions enumeration defines values used in file transfer requests.

Delegates

SecurityCriticalAction

Represents a security critical action.

Remarks

The TcpClient, TcpListener, and UdpClient classes encapsulate the details of creating TCP and UDP connections to the Internet.