SocketOptionName Enumeration
.NET Framework 4.5
Defines configuration option names.
Namespace: System.Net.Sockets
Assembly: System (in System.dll)
| Member name | Description | |
|---|---|---|
| AcceptConnection | The socket is listening. | |
| AddMembership | Add an IP group membership. | |
| AddSourceMembership | Join a source group. | |
| BlockSource | Block data from a source. | |
| Broadcast | Permit sending broadcast messages on the socket. | |
| BsdUrgent | Use urgent data as defined in RFC-1222. This option can be set only once; after it is set, it cannot be turned off. | |
| ChecksumCoverage | Set or get the UDP checksum coverage. | |
| Debug | Record debugging information. | |
| DontFragment | Do not fragment IP datagrams. | |
| DontLinger | Close the socket gracefully without lingering. | |
| DontRoute | Do not route; send the packet directly to the interface addresses. | |
| DropMembership | Drop an IP group membership. | |
| DropSourceMembership | Drop a source group. | |
| Error | Get the error status and clear. | |
| ExclusiveAddressUse | Enables a socket to be bound for exclusive access. | |
| Expedited | Use expedited data as defined in RFC-1222. This option can be set only once; after it is set, it cannot be turned off. | |
| HeaderIncluded | Indicates that the application provides the IP header for outgoing datagrams. | |
| HopLimit | Specifies the maximum number of router hops for an Internet Protocol version 6 (IPv6) packet. This is similar to Time to Live (TTL) for Internet Protocol version 4. | |
| IPOptions | Specifies the IP options to be inserted into outgoing datagrams. | |
| IPProtectionLevel | Enables restriction of a IPv6 socket to a specified scope, such as addresses with the same link local or site local prefix.This socket option enables applications to place access restrictions on IPv6 sockets. Such restrictions enable an application running on a private LAN to simply and robustly harden itself against external attacks. This socket option widens or narrows the scope of a listening socket, enabling unrestricted access from public and private users when appropriate, or restricting access only to the same site, as required. This socket option has defined protection levels specified in the IPProtectionLevel enumeration. | |
| IpTimeToLive | Set the IP header Time-to-Live field. | |
| IPv6Only | Indicates if a socket created for the AF_INET6 address family is restricted to IPv6 communications only. Sockets created for the AF_INET6 address family may be used for both IPv6 and IPv4 communications. Some applications may want to restrict their use of a socket created for the AF_INET6 address family to IPv6 communications only. When this value is non-zero (the default on Windows), a socket created for the AF_INET6 address family can be used to send and receive IPv6 packets only. When this value is zero, a socket created for the AF_INET6 address family can be used to send and receive packets to and from an IPv6 address or an IPv4 address. Note that the ability to interact with an IPv4 address requires the use of IPv4 mapped addresses. This socket option is supported on Windows Vista or later. | |
| KeepAlive | Use keep-alives. | |
| Linger | Linger on close if unsent data is present. | |
| MaxConnections | Not supported; will throw a SocketException if used. | |
| MulticastInterface | Set the interface for outgoing multicast packets. | |
| MulticastLoopback | An IP multicast loopback. | |
| MulticastTimeToLive | An IP multicast Time to Live. | |
| NoChecksum | Send UDP datagrams with checksum set to zero. | |
| NoDelay | Disables the Nagle algorithm for send coalescing. | |
| OutOfBandInline | Receives out-of-band data in the normal data stream. | |
| PacketInformation | Return information about received packets. | |
| ReceiveBuffer | Specifies the total per-socket buffer space reserved for receives. This is unrelated to the maximum message size or the size of a TCP window. | |
| ReceiveLowWater | Specifies the low water mark for Receive operations. | |
| ReceiveTimeout | Receive a time-out. This option applies only to synchronous methods; it has no effect on asynchronous methods such as the BeginSend method. | |
| ReuseAddress | Allows the socket to be bound to an address that is already in use. | |
| SendBuffer | Specifies the total per-socket buffer space reserved for sends. This is unrelated to the maximum message size or the size of a TCP window. | |
| SendLowWater | Specifies the low water mark for Send operations. | |
| SendTimeout | Send a time-out. This option applies only to synchronous methods; it has no effect on asynchronous methods such as the BeginSend method. | |
| Type | Get the socket type. | |
| TypeOfService | Change the IP header type of the service field. | |
| UnblockSource | Unblock a previously blocked source. | |
| UpdateAcceptContext | Updates an accepted socket's properties by using those of an existing socket. This is equivalent to using the Winsock2 SO_UPDATE_ACCEPT_CONTEXT socket option and is supported only on connection-oriented sockets. | |
| UpdateConnectContext | Updates a connected socket's properties by using those of an existing socket. This is equivalent to using the Winsock2 SO_UPDATE_CONNECT_CONTEXT socket option and is supported only on connection-oriented sockets. | |
| UseLoopback | Bypass hardware when possible. |
The SocketOptionName enumeration defines the name of each Socket configuration option. Sockets can be configured with the Socket.SetSocketOption method.
The following code example uses this enumeration to set socket options.
// Send operations will time-out if confirmation
// is not received within 1000 milliseconds.
s.SetSocketOption (SocketOptionLevel.Socket, SocketOptionName.SendTimeout, 1000);
// The socket will linger for 10 seconds after Socket.Close is called.
LingerOption lingerOption = new LingerOption (true, 10);
s.SetSocketOption (SocketOptionLevel.Socket, SocketOptionName.Linger, lingerOption);
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.
