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У меня есть TCP-сервер, который постоянно получает потоки tcp из разных источников. У меня есть внешнее событие, которое вызывает остановку, и когда это произойдет, порт TCP должен быть выпущен. Приведенный ниже код работает правильно, за исключением закрытия. Закрытие не освобождает порт, а порт tcp застрял в состоянии прослушивания. любая помощь будет действительно велика. Спасибо.Освобождение порта tcp, асинхронный вызов
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
using System.Windows.Forms;
namespace TestTest
{
public class tcpserver
{
//State object for reading client data asynchronously
public class StateObject
{
// Client socket.
public Socket workSocket = null;
// Size of receive buffer.
public const int BufferSize = 2097152;
// Receive buffer.
public byte[] buffer = new byte[BufferSize];
// Received data string.
public StringBuilder sb = new StringBuilder();
}
public class AsynchronousSocketListener
{
public Form10 m_parent;
Socket parentlistener;
// Incoming data from client.
public static string data = null;
// Thread signal.
public static ManualResetEvent allDone = new ManualResetEvent(false);
public AsynchronousSocketListener()
{
}
public void StartListening(Form10 frm10)
{
m_parent = frm10;
try
{
// Data buffer for incoming data.
byte[] bytes = new Byte[2097152];
int port = Convert.ToInt32(m_parent.textBox2.Text.Trim());
IPAddress ipv4 = IPAddress.Parse(m_parent.comboBox1.SelectedItem.ToString().Trim());
IPEndPoint localEndPoint = new IPEndPoint(ipv4, port);
// Create a TCP/IP socket.
parentlistener = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
parentlistener.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, false);
LingerOption lo = new LingerOption(false, 0);
parentlistener.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Linger, lo);
//setting the array to have this ip and port
m_parent.m_parent.setUsedIPport(m_parent.comboBox1.SelectedItem.ToString().Trim() + ":" + m_parent.textBox2.Text.Trim());
// Bind the socket to the local endpoint and listen for incoming connections.
try
{
parentlistener.Bind(localEndPoint); // THIS IS THE PORT I WOULD LIKE TO RELEASE ON AN EXTERNAL TRIGGER
parentlistener.Listen(100);
while (m_parent.getStopState() == false)
{
// MessageBox.Show("L");
allDone.Reset();
//// Start an asynchronous socket to listen for connections.
parentlistener.BeginAccept(new AsyncCallback(AcceptCallback), parentlistener);
}
}
catch (Exception e)
{
Console.WriteLine(e.ToString());
}
}
catch (Exception) { MessageBox.Show("Error binding to tcp port", "ERROR"); return; }
}
public void AcceptCallback(IAsyncResult ar)
{
try
{
// Signal the main thread to continue.
allDone.Set();
// Get the socket that handles the client request.
Socket listener = (Socket)ar.AsyncState;
Socket handler = listener.EndAccept(ar);
LingerOption lo = new LingerOption(false, 0);
handler.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Linger, lo);
// Create the state object.
StateObject state = new StateObject();
state.workSocket = handler;
handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReadCallback), state);
}
catch (Exception er) { //MessageBox.Show(er.ToString());
}
}
public void ReadCallback(IAsyncResult ar)
{
try
{
String line = String.Empty;
// Retrieve the state object and the handler socket
// from the asynchronous state object.
StateObject state = (StateObject)ar.AsyncState;
Socket handler = state.workSocket;
string temporaryString = "";
// Read data from the client socket.
int bytesRead = handler.EndReceive(ar);
if (bytesRead > 0)
{
// There might be more data, so store the data received so far.
state.sb.Append(Encoding.ASCII.GetString(state.buffer, 0, bytesRead));
line = state.sb.ToString(); //this goes into an external store, code is not here
handler.BeginReceive(state.buffer, 0, StateObject.BufferSize, 0, new AsyncCallback(ReadCallback), state);
}
}
}
catch (Exception er) { //MessageBox.Show(er.ToString());
}
}
public void stopListener()
{
try
{
parentlistener.Shutdown(SocketShutdown.Both);
//parentlistener.Disconnect(true);
parentlistener.Close(); //PROBLEM !!! code is not releasing the port, the tcp port continues to remain in the listening state.
parentlistener.Dispose();
}
catch (Exception Ex) { //MessageBox.Show(Ex.ToString());
}
}
}
}
}