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LingerOption.LingerTime Property

Gets or sets the amount of time to remain connected after calling the Socket.Close method if data remains to be sent.

Namespace:  System.Net.Sockets
Assembly:  System (in System.dll)

public int LingerTime { get; set; }

Property Value

Type: System.Int32
The amount of time, in seconds, to remain connected after calling Socket.Close.

Use this value if you want to determine how long a closed Socket will attempt to transfer unsent data before timing out. You can also set this value to the desired time-out period, in seconds.

If the Enabled property is true, and you set LingerTime to 0, the Socket discards any pending data to send in the outgoing network buffer. If you change this value, you must pass the altered LingerOption instance to the SetSocketOption method or set the LingerState or LingerState property.

The following table describes the behavior for the possible values of the Enabled property and the LingerTime property stored in the LingerState property.

enable

seconds

Behavior

false (disabled), the default value

The time-out is not applicable, (default).

Attempts to send pending data for a connection-oriented socket (TCP, for example) until the default IP protocol time-out expires.

true (enabled)

A nonzero time-out

Attempts to send pending data until the specified time-out expires, and if the attempt fails, then Winsock resets the connection.

true (enabled)

A zero timeout.

Discards any pending data. For connection-oriented socket (TCP, for example), Winsock resets the connection.

The IP stack computes the default IP protocol time-out period to use based on the round trip time of the connection. In most cases, the time-out computed by the stack is more relevant than one defined by an application. This is the default behavior for a socket when the LingerState property is not set.

When the LingerTime property stored in the LingerState property is set greater than the default IP protocol time-out, the default IP protocol time-out will still apply and override.

The following example displays the value of this property.


Console.WriteLine ("This application will timeout if Send does not return within " + Encoding.ASCII.GetString (s.GetSocketOption (SocketOptionLevel.Socket, SocketOptionName.SendTimeout, 4)));

// blocks until send returns
int i = s.Send (msg);

// blocks until read returns
byte[] bytes = new byte[1024];

s.Receive (bytes);

//Display to the screen
Console.WriteLine (Encoding.ASCII.GetString (bytes));
s.Shutdown (SocketShutdown.Both);
Console.WriteLine ("If data remains to be sent, this application will stay open for " + ((LingerOption)s.GetSocketOption (SocketOptionLevel.Socket, SocketOptionName.Linger)).LingerTime.ToString ());
s.Close ();


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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.

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