如何在C#中进行非阻塞套接字调用以确定连接状态？

概述Socket上Connected属性的MSDN文档说明如下： The value of the Connected property reflects the state of the connection as of the most recent operation. If you need to determine the current state of the connection, m Socket上Connected属性的MSDN文档说明如下：

The value of the Connected property
reflects the state of the connection
as of the most recent operation. If
you need to determine the current
state of the connection,make a
nonblocking,zero-byte Send call. If
the call returns successfully or
throws a WAEWOulDBLOCK error code
(10035),then the socket is still
connected; otherwise,the socket is no
longer connected.

我需要确定连接的当前状态 – 如何进行非阻塞,零字节发送调用？

解决方法 Socket.Connected属性(至少.NET 3.5版本)的MSDN文档底部的示例显示了如何执行此 *** 作：

// .Connect throws an exception if unsuccessfulclIEnt.Connect(anEndPoint);// This is how you can determine whether a socket is still connected.bool blockingState = clIEnt.Blocking;try{    byte [] tmp = new byte[1];    clIEnt.Blocking = false;    clIEnt.Send(tmp,0);    Console.Writeline("Connected!");}catch (SocketException e) {    // 10035 == WSAEWOulDBLOCK    if (e.NativeErrorCode.Equals(10035))        Console.Writeline("Still Connected,but the Send would block");    else    {        Console.Writeline("disconnected: error code {0}!",e.NativeErrorCode);    }}finally{    clIEnt.Blocking = blockingState;} Console.Writeline("Connected: {0}",clIEnt.Connected);

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