Socket Closing (C#)

[eran]

Do I have to close all the opened sockets when I close the app,

or the sockets are being closed automaticly when the app is closed?

[Derek Stone]

You should explicitly close them. Edited May 18, 2003 by Derek Stone

[Madz]

The problem i have faced is similar to like this

 

I have a TCP Listner, and i am assigining a new thread to a new incoming connection, if there are some active connections then although application is closed its proces in back is still running and then i have to go to taskmanager and then kill the process

[Derek Stone]

Set the IsBackground property of each of your threads to true.

[eran]

In any case, if I have a thread and in this thread I have

int ret = soc.Receive(receive, receive.Length, 0); 

 

I will have to use the 'Suspend' method before aborting the thread. No?

[Derek Stone]

No, however you should close that socket prior to aborting the thread, out of courteousness to the other endpoint.

[eran]

suspending the task before closing it, resolved me a problem.

 

When I used to close a thread which has the command

int ret = soc.Receive(receive, receive.Length, 0);

gave the following Exception:

 

 

System.Threading.ThreadAbortException: Thread was being aborted.

at System.ComponentModel.Win32Exception..ctor(Int32 error)

at System.Net.Sockets.SocketException..ctor()

at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 offset, Int32 size, SocketFlags socketFlags)

at System.Net.Sockets.Socket.Receive(Byte[] buffer, Int32 size, SocketFlags socketFlags)

at MaleClient.FrmMain.RecieveData() in c:\documents and settings\erany\my documents\visual studio projects\matchmaker\maleclient\frmmain.cs:line 221

[Derek Stone]

That is how threads work-- the only way to terminate them is to throw an exception, catch it at the application level and ignore it. Calling Thread.Suspend() is essentially doing nothing, since a subsequent call to Thread.Abort() will implicitly resume the thread and then abort it.

[eran]

The user won't see the exception message?

[Derek Stone]

No, they won't.

 

Dim t As New Thread(AddressOf ThreadProc)
t.Start()
Thread.Sleep(2000)
t.Abort()

 

Private Sub ThreadProc()
Try
	Do
		Trace.WriteLine("Executing...")
	Loop
Catch e As ThreadAbortException
	MessageBox.Show("""Thread.Abort()"" has been called.", "")
End Try
End Sub