AsyncCallback exception

[Steven Blair]

Hi,

I am using an AsyncCallback to receive a TcpClient on incoming
connections. The code below works fine until I start the application and
no connection is received within the time limit.
I could easily try / catch the code causing the problem but I would like
to understand why this problem is happening.
I was unable to find any field on the TcpListener that would indicate
the Listenign socket was stopped.
http://pastebin.com/882324 or

static private TcpClient _connectedClien t;

static void AcceptClient(IA syncResult ar)
{
TcpListener server = (TcpListener)ar .AsyncState;

_connectedClien t = _listenSocket.E ndAcceptTcpClie nt(ar);
}

static void Main()
{
TcpListener _listenSocket = new TcpListener(800 5);
_listenSocket.S tart();

_listenSocket.B eginAcceptTcpCl ient(new AsyncCallback(A cceptClient),
_listenSocket);

//Wait for 5 seconds for a connection
Thread.Sleep(50 00);

if( _connectedClien t == null )
{
//Failed to get a connection
//This call to stop invokes a call to AcceptClient
//This cause AcceptClient to crash on the EndAcceptTcpCli ent
_listenSocket.S top();
}
else
{
//Application begins...
}
}

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[Laura T.]

If you get SocketException it is because the socket is closed and the async
request is cancelled and it shows up as an exception at EndAcceptTcpCli ent.

"Steven Blair" <st**********@b tinternet.comha scritto nel messaggio
news:eB******** ******@TK2MSFTN GP02.phx.gbl...

Hi,

I am using an AsyncCallback to receive a TcpClient on incoming
connections. The code below works fine until I start the application and
no connection is received within the time limit.
I could easily try / catch the code causing the problem but I would like
to understand why this problem is happening.
I was unable to find any field on the TcpListener that would indicate
the Listenign socket was stopped.
http://pastebin.com/882324 or

static private TcpClient _connectedClien t;

static void AcceptClient(IA syncResult ar)
{
TcpListener server = (TcpListener)ar .AsyncState;

_connectedClien t = _listenSocket.E ndAcceptTcpClie nt(ar);
}

static void Main()
{
TcpListener _listenSocket = new TcpListener(800 5);
_listenSocket.S tart();

_listenSocket.B eginAcceptTcpCl ient(new AsyncCallback(A cceptClient),
_listenSocket);

//Wait for 5 seconds for a connection
Thread.Sleep(50 00);

if( _connectedClien t == null )
{
//Failed to get a connection
//This call to stop invokes a call to AcceptClient
//This cause AcceptClient to crash on the EndAcceptTcpCli ent
_listenSocket.S top();
}
else
{
//Application begins...
}
}

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[Steven Blair]

Thanks for the reply.

Yeah, thats what I thought.
Any idea how I can check to see the Socket is closed?

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