Cross-thread operation not valid
Cross-thread operation not valid
public void listenerThread()
{
TcpListener tcpListener = new TcpListener(IPAddress.Any,1234);
tcpListener.Start();
while(true)
{
Socket handlerSocket = tcpListener.AcceptSocket();
if (handlerSocket.Connected)
{
lbConnections.Items.Add(handlerSocket.RemoteEndPoint.ToString() +
" connected.");
lock (this)
{
alSockets.Add(handlerSocket);
}
ThreadStart thdstHandler = new
ThreadStart(handlerThread);
Thread thdHandler = new Thread(thdstHandler);
thdHandler.Start();
}
}
}
I'm having an error Cross-thread operation not valid: Control 'lbConnections' accessed from a thread other than the thread it was created on.
Please help! I don't know how to fix this
Cross-thread operation not valid
orangina
Setting CheckForIllegalCrossThreadCalls to false only hides the symptoms of the problem - the underlying cross-thread problem is still there.
You'd only want to set this property to quickly get a .NET 1.1 app quickly running when building in 2.0, and should get around to using the Invoke to call on the correct thread.
Pawan Jain
CheckForIllegalCrossThreadCalls =
false;Lukasz Pawlowski
thanks very much, do I always have to do this everytime I have a multithreaded app
I'm a delphi programmer so I'm just learning .NET 2
Fahd
Glyn123
InvokeRequired (from Control)
which tells you if the thread is allowed to access to control.
zviruga
You must change the lbConnections handling:
private delegate void ListenerCallback(string msg); private void ListenerFuction(string msg){
lbConnections.Items.Add(msg);
}
public void listenerThread(){
....
if (handlerSocket.Connected)
{
lbConnections.Invoke(new ListenerCallback(ListenerFuction),new Object[] {handlerSocket.RemoteEndPoint.ToString() + " connected."});lock (this)
....
}
Markku