如何在不使用Poll的情况下检查非阻塞套接字是否断开连接?
public delegate void SocketEventHandler(Socket socket);
public class CustomSocket : Socket
{
private readonly Timer timer;
private const int INTERVAL = 1000;
public CustomSocket(AddressFamily addressFamily, SocketType socketType, ProtocolType protocolType)
: base(addressFamily, socketType, protocolType)
{
timer = new Timer { Interval = INTERVAL };
timer.Tick += TimerTick;
}
public CustomSocket(SocketInformation socketInformation)
: base(socketInformation)
{
timer = new Timer { Interval = INTERVAL };
timer.Tick += TimerTick;
}
private readonly List<SocketEventHandler> onCloseHandlers = new List<SocketEventHandler>();
public event SocketEventHandler SocketClosed
{
add { onCloseHandlers.Add(value); }
remove { onCloseHandlers.Remove(value); }
}
public bool EventsEnabled
{
set
{
if(value)
timer.Start();
else
timer.Stop();
}
}
private void TimerTick(object sender, EventArgs e)
{
if (!Connected)
{
foreach (var socketEventHandler in onCloseHandlers)
socketEventHandler.Invoke(this);
EventsEnabled = false;
}
}
// Hiding base connected property
public new bool Connected
{
get
{
bool part1 = Poll(1000, SelectMode.SelectRead);
bool part2 = (Available == 0);
if (part1 & part2)
return false;
else
return true;
}
}
}
var socket = new CustomSocket(
//parameters
);
socket.SocketClosed += socket_SocketClosed;
socket.EventsEnabled = true;
void socket_SocketClosed(Socket socket)
{
// do what you want
}
Socket
类有一个Connected
属性。根据MSDN的说明,检查调用是非阻塞的。这不是你要找的吗?